**Monte Carlo study of the critical and the compensation behaviors of the double perovskite Sr2CrIrO6**

Publication date: Available online 6 December 2019Source: Physics Letters AAuthor(s): Othmane Amhoud, Noura Zaim, Ahmed Zaim, Mohamed KerouadAbstractThe phase diagrams and magnetic properties of double perovskite Sr2CrIrO6 have been studied by using Monte Carlo simulation based on the heat bath algorithm. The ground-state diagrams of the compound Sr2CrIrO6 have been calculated for different combinations of system parameters. The diagrams obtained are very rich and they give an idea of all the most stable configurations. The effects of the exchange interactions and the crystal field on the phase diagrams and magnetic proper...

**Source: **Physics Letters A - December 7, 2019 **Category: **Physics **Source Type: **research

**Spatial structures of islands of electron-hole liquid in semiconductor quantum wells**

Publication date: Available online 6 December 2019Source: Physics Letters AAuthor(s): A.A. Chernyuk, V.I. SugakovAbstractThe formation of the different structures of islands of electron-hole liquid in the quantum well is studied in a statistical model. The interaction between the islands of electron-hole liquid is considered by influencing of neighboring islands through exciton gas around the considered island. Two restricted regions were studied: an infinite strip and a disk. The theory gives the possibility to determine the probability of different states realization and to find the most probable state. The dependence of...

**Source: **Physics Letters A - December 7, 2019 **Category: **Physics **Source Type: **research

**The nonlinear wave in semiconductor quantum plasma for laser beam in a self-consistent plasma channel**

Publication date: Available online 6 December 2019Source: Physics Letters AAuthor(s): Neelam Rani, Manikant Yadav, Y.K. MathurAbstractIn this paper investigating the current task, our emphasis is on distributed a serious laser beam in a self-made plasma channel. As the intensity of the laser beam increases, the medium displays the neuromuscular electrical conductivity functioning as a result of the mass effectiveness of the effectiveness of the electrons as well as the intensity of the electrons. Based on Wentzel–Kramers–Brillouin and paraxial ray theory, the steady-state solution of an intense, Gaussian electr...

**Source: **Physics Letters A - December 7, 2019 **Category: **Physics **Source Type: **research

**L-mode to H-mode transition triggered by sawtooth-induced heat flux in EAST**

Publication date: Available online 5 December 2019Source: Physics Letters AAuthor(s): L.M. Shao, G.S. Xu, N. Yan, R. Chen, L. Chen, Y.M. Duan, W. Gao, J.P. Qian, W. Shen, A. Ti, M. Xu, Q. Yu, L. Zhang, T.F. Zhou, the EAST TeamAbstractH-modes induced by sawtooth events can be often observed in discharges with marginal auxiliary power injection in EAST. Poloidal flow shear at the very plasma edge, increasing ∼25% up to the threshold value, is observed just before the L-H transition by means of a fast reciprocating probe array in EAST. This suddenly risen poloidal flow shear, caused by the increased turbulent driven Reyno...

**Source: **Physics Letters A - December 7, 2019 **Category: **Physics **Source Type: **research

**Local impact of Stone–Wales defect on a single layer GNRFET**

Publication date: Available online 4 December 2019Source: Physics Letters AAuthor(s): Hassan Shamloo, Atefeh Nazari, Rahim Faez, Ali ShahhoseiniAbstractIn this work, a new structure of single layer armchair graphene nanoribbon field effect transistor with the Stone–Wales (SW) defect (SWGNRFET) is studied. The simulations are solved with Poisson–Schrödinger equation self-consistently by using Non-Equilibrium Green Function (NEGF) and in the real space approach. The energy band structure is obtained by approximation tight-binding method. The results show that displacement of a defect in the width of the chan...

**Source: **Physics Letters A - December 5, 2019 **Category: **Physics **Source Type: **research

**Phase transition of nanoscale Au atom chains on NiAl(110)**

Publication date: Available online 3 December 2019Source: Physics Letters AAuthor(s): Bei-bei Yi, Rui Pang, Xiaoyan Ren, Haizhong Guo, Yuan Shang, Xiangmei Duan, Jun-Hyung Cho, Shunfang LiAbstractRecently, 1D Au single atom chains (SAC) were artificially constructed on the NiAl(110) surface in experiment, which has stimulated various experimental and theoretical investigations on its potential applications such as in microelectronics and catalysis. Here, we reexamine their relative stabilities and formation mechanism on NiAl(110) using first-principles calculations. We reveal that in the range of N=2∼6, the formation o...

**Source: **Physics Letters A - December 4, 2019 **Category: **Physics **Source Type: **research

**Topological modes in radiofrequency resonator arrays**

Publication date: Available online 3 December 2019Source: Physics Letters AAuthor(s): Henning U. Voss, Douglas J. BallonAbstractTopological properties of solid states have sparked considerable recent interest due to their importance in the physics of lattices with a non-trivial basis and their potential in the design of novel materials. Here we describe an experimental and an accompanying numerical toolbox to create and analyze topological states in radiofrequency resonator arrays including non-local coupling. These arrays are very easily constructed, offer a variety of geometric configurations, and their eigenfunctions an...

**Source: **Physics Letters A - December 4, 2019 **Category: **Physics **Source Type: **research

**Effective potential for emergent Majorana fermions in superconductor systems**

Publication date: Available online 3 December 2019Source: Physics Letters AAuthor(s): A.W. Teixeira, V.L. Carvalho-Santos, J.M. FonsecaAbstractMajorana fermions cannot be found in nature as a free fundamental particle. Nevertheless, in condensed matter systems, they can emerge as a collective excitation. In this work, using functional integration techniques, we calculated the effective potential for emergent Majorana fermions in the Kitaev chain. In this case, we have shown how the superconductor parameter behaves as a function of temperature. Furthermore, we considered surface-induced superconductivity in a Topological In...

**Source: **Physics Letters A - December 4, 2019 **Category: **Physics **Source Type: **research

**Couette flows between various bounding substrates**

Publication date: Available online 3 December 2019Source: Physics Letters AAuthor(s): L.V. Mirantsev, A.K. AbramyanAbstractMolecular dynamics simulations of equilibrium structures and Couette flows of polar water molecules and nonpolar argon atoms between bounding carbon substrates disposed at the distance h=1.5 nm from each other have been performed. Two symmetric configurations when both substrates have similar, either graphene - like crystalline or amorphous structures, and one asymmetric configuration consisted of one substrate with graphene - like crystalline structure and another substrate with amorphous structure ha...

**Source: **Physics Letters A - December 4, 2019 **Category: **Physics **Source Type: **research

**The fractional discrete nonlinear Schrödinger equation**

Publication date: Available online 3 December 2019Source: Physics Letters AAuthor(s): Mario I. MolinaAbstractWe examine a fractional version of the discrete nonlinear Schrödinger (dnls) equation, where the usual discrete laplacian is replaced by a fractional discrete laplacian. This leads to the replacement of the usual nearest-neighbor interaction to a long-range intersite coupling that decreases asymptotically as a power-law. For the linear case, we compute both, the spectrum of plane waves and the mean square displacement of an initially localized excitation in closed form, in terms of regularized hypergeometric fu...

**Source: **Physics Letters A - December 4, 2019 **Category: **Physics **Source Type: **research

**Non-Abelian gauge potentials driven localization transition in quasiperiodic optical lattices**

Publication date: Available online 22 November 2019Source: Physics Letters AAuthor(s): En Guo Guan, Hang Yu, Gang WangAbstractDerived from quantum waves immersed in an Abelian gauge potential, the quasiperiodic Aubry-André-Harper (AAH) model is a simple yet powerful Hamiltonian to study the Anderson localization of ultracold atoms. Here, we investigate the localization properties of ultracold atoms in quasiperiodic optical lattices subject to a non-Abelian gauge potential, which are depicted by non-Abelian AAH models. We identify that the non-Abelian AAH models can bear the self-duality. We analyze the localization ...

**Source: **Physics Letters A - December 1, 2019 **Category: **Physics **Source Type: **research

**Lump-type solutions, rogue wave type solutions and periodic lump-stripe interaction phenomena to a (3 + 1)-dimensional generalized breaking soliton equation**

Publication date: Available online 29 November 2019Source: Physics Letters AAuthor(s): L.T. Gai, W.X. Ma, M.C. LiAbstractIn this paper, we present a bilinear form for an extended (2+1)-dimensional generalized breaking soliton equation, namely, a (3+1)-dimensional generalized breaking soliton (GBS) equation, through using the Hirota direct method. Abundant lump-type solutions, rogue wave type solutions, breather lump wave solutions and interaction solutions are constructed, based on the Hirota bilinear form. Particularly, we generate a type of new interaction solutions in terms of a new combination of quadratic function, tr...

**Source: **Physics Letters A - December 1, 2019 **Category: **Physics **Source Type: **research

**Deterministic twirling with low resources**

We present a general algebraic method allowing us to choose a set of - typically very few - unitary operators which, when applied randomly and repeatedly, produce the given twirling operation exponentially quickly. The method is applied to twirling operations for bipartite quantum systems with respect to the unitary group U(d)⊗U(d), an essential ingredient in entanglement distillation protocols. In particular, we provide a complete classification of sets of unitary operators capable of performing twirling on two qubits. Moreover, we construct a generic set containing at most three unitary operators achieving the twi...

**Source: **Physics Letters A - November 29, 2019 **Category: **Physics **Source Type: **research

**Room temperature high Giant Magnetoresistance graphene based spin valve and its application for realization of logic gates**

In this study we carried out first principle calculations for spin dependent electronic transport in our proposed spintronic device consisting of graphene nanoribbon as scattering region with cobalt electrodes and magnesium oxide as tunneling barrier. The I–V Characteristics are calculated by using Non-Equilibrium Green's Function formalism in combination with Semi-Empirical (SE) Extended Huckel Theory (EHT) using Atomistic Tool Kit software at room temperature. The high value of GMR (Giant Magnetoresistance) is recommended for spintronic devices. The results reveal that the device shows a very high GMR ratio of 5.16...

**Source: **Physics Letters A - November 29, 2019 **Category: **Physics **Source Type: **research

**Quantum counterpart of measure synchronization: A study on a pair of Harper systems**

Publication date: Available online 28 November 2019Source: Physics Letters AAuthor(s): Saikat Sur, Anupam GhoshAbstractMeasure synchronization is a well-known phenomenon in coupled classical Hamiltonian systems over last two decades. Here, synchronization in a pair of coupled Harper systems is investigated both in classical and quantum contexts. It seems that the concept of measure synchronization is restricted in the classical limit as it involves with the phase space. We show the quantum counterpart of the synchronization in a pair of coupled quantum kicked Harper chains. In the quantum context, the coupling occurs betwe...

**Source: **Physics Letters A - November 29, 2019 **Category: **Physics **Source Type: **research

**The Lambert-Kaniadakis Wκ function**

Publication date: Available online 28 November 2019Source: Physics Letters AAuthor(s): J.L.E. da Silva, G.B. da Silva, R.V. RamosAbstractIn the present work, we introduce the Lambert-Kaniadakis Wκ function. It is a generalization of the Lambert W function that solves the equation Wκ(z)expκ(Wκ(z))=z, where expκ(z) is the κ-exponential, a generalization of the exponential function proposed by Kaniadakis. Following, the Wκ function is used in the definition of the κ-disentropy. Analytical results and numerical calculations of Wκ are shown, as well some applications o...

**Source: **Physics Letters A - November 29, 2019 **Category: **Physics **Source Type: **research

**Multiple bright and dark soliton solutions in three component spinor Bose-Einstein condensates**

Publication date: Available online 27 November 2019Source: Physics Letters AAuthor(s): V. Rajadurai, V. Ramesh Kumar, R. RadhaAbstractWe investigate a quasi one dimensional spin-1 Bose-Einstein Condensates (BEC) in the absence of an external confinement governed by a system of three coupled Gross-Pitaevskii (GP) equation. Based on the Lax-pair, we construct one soliton solution employing gauge transformation method. In addition, the multiple bright and dark soliton solutions are obtained by properly choosing amplitude dependent parameter in the Lax-pair. The results of the paper emphasizes the richness in the structure of ...

**Source: **Physics Letters A - November 28, 2019 **Category: **Physics **Source Type: **research

**Effect of atomic configuration on band gap behaviour in CH3NH3SnxPb1−xI3 perovskites**

Publication date: Available online 27 November 2019Source: Physics Letters AAuthor(s): Li Guan, Xiaofang Xu, Yanan Liang, Shichuang Han, Jianxin Guo, Jianglong Wang, Xu LiAbstractThe atomic structure and electronic properties of Sn/Pb mixed organometal halide perovskites were investigated by using first-principles method. The structure-dependent band gap behaviour of tetragonal and pseudocubic MASnxPb1−xI3 (0⩽x⩽1) was emphasized. The configurations with two or more adjacent Sn octahedra in the same layer inducing less tilting of neighbouring octahedra have the lower formation energy. For tetragonal or pseudocubic...

**Source: **Physics Letters A - November 28, 2019 **Category: **Physics **Source Type: **research

**First-principles study on electronic and optical properties of S, N single-doped and S-N co-doped ZnO**

Publication date: Available online 27 November 2019Source: Physics Letters AAuthor(s): Wei-wei Liu, Cheng-lin Liu, Xiao-bo Chen, Jian-hua Lu, Hong-xia Chen, Zhong-zheng MiaoAbstractThe electronic and optical properties of undoped, N single-doped, S single-doped, and S-N co-doped ZnO were systematically investigated by first-principles calculations. The lattice parameters of S single-doped and S-N co-doped ZnO clearly increased. After N-doping, a strongly localized impurity energy level of N was formed near the Fermi level at the top of valence band (VB). In S-N co-doped ZnO, the localization of N weakened, and the Fermi le...

**Source: **Physics Letters A - November 28, 2019 **Category: **Physics **Source Type: **research

**Insights on electronic structures, elastic features and optical properties of mixed-valence double perovskites Cs2Au2X6 (X=F, Cl, Br, I)**

Publication date: Available online 27 November 2019Source: Physics Letters AAuthor(s): Xue Du, Dafang He, Huayue Mei, Yuhan Zhong, Nanpu ChengAbstractIn this work, we investigate the X-dependent crystal, electronic, elastic and optical properties of mixed-valence double perovskites Cs2Au2X6 (X=F, Cl, Br, I) based on first principles. The effects of all atomic sites, especially the [AuX2]− and [AuX4]− clusters with different valences of Au atoms, in the crystal structures of Cs2Au2X6 on their electronic and optical properties have been clarified. Meanwhile, Cs2Au2X6 double perovskites with direct band gaps have ...

**Source: **Physics Letters A - November 28, 2019 **Category: **Physics **Source Type: **research

**An elementary rigorous proof of bulk-boundary correspondence in the generalized Su-Schrieffer-Heeger model**

Publication date: Available online 27 November 2019Source: Physics Letters AAuthor(s): Bo-Hung Chen, Dah-Wei ChiouAbstractWe generalize the Su-Schrieffer-Heeger (SSH) model with the inclusion of arbitrary long-range hopping amplitudes, providing a simple framework to investigate arbitrary adiabatic deformations that preserve the chiral symmetry upon the bulk energy bands with any arbitrary winding numbers. Using only elementary techniques of solving linear difference equations and applying Cauchy's integral formula, we obtain a mathematically rigorous and physically transparent proof of the bulk-boundary correspondence for...

**Source: **Physics Letters A - November 28, 2019 **Category: **Physics **Source Type: **research

**Preparation and characterization of SiO2 nanowires using a SnO2 catalyst**

Publication date: Available online 27 November 2019Source: Physics Letters AAuthor(s): Hang Lv, Yan Tao, Xibao Yang, Jinglong Zhao, Shucheng Liu, Shuanglong Chen, Qiushi Wang, Ge Zhu, Xiaodong Lu, Bo Liu, Zhen YaoAbstractSiO2 nanowires have been successfully synthesized on the surface of the silicon substrate via a thermal evaporation method using SnO2 powders as the catalysts. The final synthesized product was systematically studied by X-ray powder diffraction (XRD), Raman spectroscopy (RS), scanning electron microscopy (SEM), and electron energy dispersive X-ray (EDX), UV-Visible absorption and photoluminescence (PL) spe...

**Source: **Physics Letters A - November 28, 2019 **Category: **Physics **Source Type: **research

**Friction behavior of monolayer molybdenum diselenide nanosheet under normal electric field**

This study reveals a possibility of electronically controlling friction in two-dimensional MoSe2 system, with potential applications in solid lubricant and moving parts for MEMS devices. (Source: Physics Letters A)

**Source: **Physics Letters A - November 28, 2019 **Category: **Physics **Source Type: **research

**Bright solitary waves on a torus: Existence, stability and dynamics for the nonlinear Schrödinger model**

Publication date: Available online 26 November 2019Source: Physics Letters AAuthor(s): J. D'Ambroise, P.G. Kevrekidis, P. SchmelcherAbstractMotivated by recent developments in the realm of matter waves, we explore the potential of creating solitary waves on the surface of a torus. This is an intriguing perspective due to the role of curvature in the shape and dynamics of the coherent structures. We find different families of bright solitary waves for attractive nonlinearities including ones localized in both angular directions, as well as waves localized in one direction and homogeneous in the other. The waves localized in...

**Source: **Physics Letters A - November 28, 2019 **Category: **Physics **Source Type: **research

**Raman-based measurement of carrier concentration in n-type ZnO thin films under resonant conditions**

Publication date: Available online 26 November 2019Source: Physics Letters AAuthor(s): Zhuang Mao, Cong Fu, Xinhua Pan, Xiangyang Chen, Haiping He, Wei Wang, Yujia Zeng, Zhizhen YeAbstractFor Raman-based carrier concentration determination in thin film semiconductors, above-band-gap excitation is necessary, as the interference from underlying substrate is eliminated by limited photon penetration depth. With resonant Raman spectroscopy, this study investigates the plasmon-phonon coupled modes in n-type ZnO films to non-destructively probe the carrier concentration. The observed coupled mode slightly redshifts from A1(LO) fr...

**Source: **Physics Letters A - November 28, 2019 **Category: **Physics **Source Type: **research

**Overlaps of deformed and non-deformed harmonic oscillator basis states**

The objective is to provide analytical results for calculating these overlaps (transformation brackets) between deformed and non-deformed basis states in spherical, cylindrical, and Cartesian coordinates. These overlaps can be used for reducing the complexity of different research problems that employ three-dimensional harmonic oscillator basis states, for example as used in coherent state theory and the nuclear shell-model, especially within the context of ab initio symmetry-adapted no-core shell model. (Source: Physics Letters A)

**Source: **Physics Letters A - November 26, 2019 **Category: **Physics **Source Type: **research

**An ultra-thin acoustic metasurface with multiply resonant units**

Publication date: Available online 22 November 2019Source: Physics Letters AAuthor(s): Haozhen Zou, Pan Li, Pai PengAbstractIn this paper, we propose an ultra-thin acoustic metasurface constructed of multiply resonant units to manipulate reflected wavefront. As a counterpart to the Helmholtz resonator (with monopolar resonance) and membrane-type resonator (with dipolar resonance), the multiply resonator are used in metamaterials to induce strong quadrupolar resonance. Here we use the multiply resonator as a new kind of building blocks to make acoustic metasurfaces. The used multiply resonant unit is composed of solid mater...

**Source: **Physics Letters A - November 24, 2019 **Category: **Physics **Source Type: **research

**Double optomechanically induced transparency in a Laguerre-Gaussian rovibrational cavity**

Publication date: Available online 22 November 2019Source: Physics Letters AAuthor(s): Jia-Xin Peng, Zheng Chen, Qi-Zhang Yuan, Xun-Li FengAbstractThe optomechanically induced transparency (OMIT), an optomechanical analogue of electromagnetically induced transparency, is a very interesting interference phenomenon. Recently, the studies on the OMIT have been extended to double-OMIT by integrating more optical or mechanical subsystems such as mechanical oscillators, coupled cavities, and atoms in vibrational cavity. In this paper, we demonstrate the double-OMIT can be observed in Laguerre-Gaussian (L-G) rovibrational cavity ...

**Source: **Physics Letters A - November 24, 2019 **Category: **Physics **Source Type: **research

**Non-Abelian gauge potential driven localization transition in quasiperiodic optical lattices**

Publication date: Available online 22 November 2019Source: Physics Letters AAuthor(s): En Guo Guan, Hang Yu, Gang WangAbstractDerived from quantum waves immersed in an Abelian gauge, the quasiperiodic Aubry-Andre-Harper (AAH) model is a simple yet powerful Hamiltonian to study the Anderson localization of ultracold atoms. Here, we investigate the localization properties of ultracold atoms in quasiperiodic optical lattices subject to a non-Abelian gauge, which are depicted by non-Abelian AAH models. We identify that the non-Abelian AAH models can bear the self-duality. We analyze the localization of such non-Abelian self-du...

**Source: **Physics Letters A - November 24, 2019 **Category: **Physics **Source Type: **research

**Optical characteristics of dilute gallium phosphide bismide: Promising material for near-infra photonic device applications**

We report the optical and electronic characteristics of GaP1−xBix bismide alloys with dilute composition 0≤x≤0.187 in the cubic zinc blende crystallographic phase calculated using a scalar relativistic Full Potential Linear Augmented Plane Wave method within Density Functional Theory. The equilibrium lattice constants are calculated using the improved generalized gradient approximation of Wu and Cohen in excellent agreement with experimental values. A quasi-linear dependence of the lattice parameters on Bi composition is obtained. Electronic structures such as the band gap, total density of states and partial d...

**Source: **Physics Letters A - November 22, 2019 **Category: **Physics **Source Type: **research

**Exploring the effect of dopant (Si, P, S, Ge, Se, and Sb) in arsenene: A DFT study**

Publication date: Available online 21 November 2019Source: Physics Letters AAuthor(s): Qingxiao Zhou, Yanling Liu, Weiwei Ju, Qian Zhang, Jiahui LiAbstractThe structural, electronic and magnetic properties of arsenene were investigated using DFT (density functional theory). The charge transfer, large biding energies, and short bond lengths indicate that the doped structures are robust. Si, S, Ge and Se doping induce magnetic state in arsenene. The principal contribution to the magnetic moment is originates in the p-orbital of dopants and adjacent As atoms, as is suggested by the results of the application of PDOS (Projecte...

**Source: **Physics Letters A - November 22, 2019 **Category: **Physics **Source Type: **research

**Solid-state synthesis and fluorescence properties of micron Bi2MoO6:Eu3+/C3N4 composite phosphors**

Publication date: Available online 21 November 2019Source: Physics Letters AAuthor(s): Xue Jiang, Shuangju Song, Jiahui Guo, Wenqing Lv, Yunshuai Li, Xiaoqing Guo, Xue Wang, Haiyan Liu, Yuanyuan Han, Liyong WangAbstractThe red emitting composite phosphors Bi2MoO6:Eu3+/C3N4 were prepared via a solid-state method and characterized by different techniques like XRD, SEM, FT-IR, Raman, UV-vis DRS and PL. The effects of reaction temperature and C3N4 amount on the structure and optical properties of Bi2MoO6 were studied in detail. The powder X-ray diffraction patterns showed that the crystal phase structure changed with the incre...

**Source: **Physics Letters A - November 22, 2019 **Category: **Physics **Source Type: **research

**Tunable electronic and optical properties of SnC/BAs heterostructure by external electric field and vertical strain**

Publication date: Available online 21 November 2019Source: Physics Letters AAuthor(s): R.Q. Sheng, X.Q. Deng, Z.H. Zhang, Z.Q. FanAbstractBased on the first-principles method, we investigate the electronic structure of SnC/BAs van der Waals (vdW) heterostructure and find that it has an intrinsic type-II band alignment with a direct band gap of 0.22 eV, which favors the separation of photogenerated electron–hole pairs. The band gap can be effectively modulated by applying vertical strain and external electric field, displaying a large alteration of band gap via the strain and experiencing an indirect-to-direct band ga...

**Source: **Physics Letters A - November 22, 2019 **Category: **Physics **Source Type: **research

**Editors**

Publication date: 31 January 2020Source: Physics Letters A, Volume 384, Issue 3Author(s): (Source: Physics Letters A)

**Source: **Physics Letters A - November 22, 2019 **Category: **Physics **Source Type: **research

**Experimental and numerical study of the propagation of focused wave groups in the nearshore zone**

Publication date: Available online 20 November 2019Source: Physics Letters AAuthor(s): Iskander Abroug, Nizar Abcha, Denys Dutykh, Armelle Jarno, François MarinAbstractThe propagation of focused wave groups in intermediate water depth and the shoaling zone is experimentally and numerically considered in this paper. The experiments are carried out in a two-dimensional wave flume and wave trains derived from Pierson-Moskowitz and JONSWAP spectrum are generated. The peak frequency does not change during the wave train propagation for Pierson-Moskowitz waves; however, a downshift of this peak is observed for JONSWAP wav...

**Source: **Physics Letters A - November 21, 2019 **Category: **Physics **Source Type: **research

**Stochastic resonance in Hopfield neural networks for transmitting binary signals**

Publication date: Available online 20 November 2019Source: Physics Letters AAuthor(s): Lingling Duan, Fabing Duan, François Chapeau-Blondeau, Derek AbbottAbstractWe investigate the stochastic resonance phenomenon in a discrete Hopfield neural network for transmitting binary amplitude modulated signals, wherein the binary information is represented by two stored patterns. Based on the potential energy function and the input binary signal amplitude, the observed stochastic resonance phenomena involve two general noise-improvement mechanisms. A suitable amount of added noise assists or accelerates the switch of the net...

**Source: **Physics Letters A - November 21, 2019 **Category: **Physics **Source Type: **research

**Estimation of the lowest limit of 1/f noise in semiconductor materials**

Publication date: Available online 20 November 2019Source: Physics Letters AAuthor(s): Ferdinand GrüneisAbstractA lowest limit of 1/f noise in semiconductor materials has not yet been reported; we do not even know if such a lowest limit exists. 1/f noise in semiconductors has recently been brought into relation with 1/f noise in quantum dots and other materials. These materials exhibit on-off states which are power-law distributed over a wide range of timescales. We transfer such findings to semiconductors, assuming that the g-r process is also controlled by such on-off states. As a result, we obtain 1/f noise which c...

**Source: **Physics Letters A - November 21, 2019 **Category: **Physics **Source Type: **research

**Entanglement in three coupled harmonic oscillators**

Publication date: Available online 19 November 2019Source: Physics Letters AAuthor(s): Abdeldjalil Merdaci, Ahmed JellalAbstractWe develop an approach in solving exactly the problem of three-body oscillators including general quadratic interactions in the coordinates for arbitrary masses and couplings. We introduce a unitary transformation of three independent angles to end up with a diagonalized Hamiltonian. Using the representation theory of the group SU(3), we explicitly determine the solutions of the energy spectrum. Considering the ground state together with reduced density matrix, we derive the corresponding purity f...

**Source: **Physics Letters A - November 21, 2019 **Category: **Physics **Source Type: **research

**Analytical solution for the collapse motion of an empty hyper-spherical bubble in N dimensions**

Publication date: Available online 19 November 2019Source: Physics Letters AAuthor(s): Yupeng QinAbstractThe Rayleigh-Plesset equation including the surface tension for the collapse motion of an empty hyper-spherical bubble is considered. Firstly, the collapse time is derived. Secondly, a direct approach based on polynomial function is proposed and employed to construct the analytical solution for this case. It is shown that, when the surface tension is zero, the obtained analytical solution is equivalent to the known one but in a different form. In addition, we also discuss the influences of the relevant physical paramete...

**Source: **Physics Letters A - November 21, 2019 **Category: **Physics **Source Type: **research

**Integrable turbulence for a coupled nonlinear Schrödinger system**

Publication date: Available online 14 November 2019Source: Physics Letters AAuthor(s): Xi-Yang Xie, Sheng-Kun Yang, Chun-Hui Ai, Ling-Cai KongAbstractIn this manuscript, we aim to study turbulence for a coupled nonlinear Schrödinger system, and find the cause of the appearance of rogue waves in such system. The initial conditions are chosen as the constant backgrounds of unit amplitudes with random perturbations. We list some cases of the standard deviations of one component for the initial conditions, to investigate the influences of the initial conditions on the intensity profiles and peak amplitudes of the two chao...

**Source: **Physics Letters A - November 16, 2019 **Category: **Physics **Source Type: **research

**Editors**

Publication date: 20 January 2020Source: Physics Letters A, Volume 384, Issue 2Author(s): (Source: Physics Letters A)

**Source: **Physics Letters A - November 14, 2019 **Category: **Physics **Source Type: **research

**Lorentzian solitary wave in a generalised nonlinear Schrödinger equation**

Publication date: Available online 12 November 2019Source: Physics Letters AAuthor(s): M.A. Rego-MonteiroAbstractWe obtain a travelling-wave solution of a generalised nonlinear Schrödinger equation with an additional term of the form Γ(ψ(x,t))=λψ(x,t)q, where λ and q are real constants. Moreover, we show that the density of energy of the system for the travelling-wave solution presents a Lorentzian solitary wave behaviour. (Source: Physics Letters A)

**Source: **Physics Letters A - November 13, 2019 **Category: **Physics **Source Type: **research

**Inter-relations between additive shape invariant superpotentials**

Publication date: Available online 12 November 2019Source: Physics Letters AAuthor(s): Jeffry V. Mallow, Asim Gangopadhyaya, Jonathan Bougie, Constantin RasinariuAbstractAll known additive shape invariant superpotentials in nonrelativistic quantum mechanics belong to one of two categories: superpotentials that do not explicitly depend on ħ, and their ħ-dependent extensions. The former group themselves into two disjoint classes, depending on whether the corresponding Schrödinger equation can be reduced to a hypergeometric equation (type-I) or a confluent hypergeometric equation (type-II). All the superpotentials with...

**Source: **Physics Letters A - November 13, 2019 **Category: **Physics **Source Type: **research

**Macroscopic instructions vs microscopic operations in quantum circuits**

Publication date: Available online 12 November 2019Source: Physics Letters AAuthor(s): A. Veitia, M.P. da Silva, R. Blume-Kohout, S.J. van EnkAbstractIn many experiments on microscopic quantum systems, it is implicitly assumed that when a macroscopic procedure or “instruction” is repeated many times – perhaps in different contexts – each application results in the same microscopic quantum operation. But in practice, the microscopic effect of a single macroscopic instruction can easily depend on its context. If undetected, this can lead to unexpected behavior and unreliable results. Here, we design a...

**Source: **Physics Letters A - November 13, 2019 **Category: **Physics **Source Type: **research

**An approach for the calculation of local dielectric properties in nanosized systems on the basis of coupled dipoles method**

Publication date: Available online 12 November 2019Source: Physics Letters AAuthor(s): Kirill A. EmelyanenkoAbstractDespite interest in a description of nanoscale systems properties, there is still a lack of methods that can grasp size dependence and variation across the interface of the static dielectric properties. We propose an approach for the calculation of local nanoscopic electric susceptibility and dielectric permittivity tensors in nanosized systems on the basis of the coupled dipoles method. Requiring only the polarizability of individual molecules, this approach allows one to determine the local dielectric prope...

**Source: **Physics Letters A - November 13, 2019 **Category: **Physics **Source Type: **research

**Unstable cAMP wave patterns during aggregation of Dictyostelium discoideum cells**

Publication date: Available online 12 November 2019Source: Physics Letters AAuthor(s): N.R. Zaoro, C.B. Tabi, A.S. Etémé, T.C. KofanéAbstractFlow-driven formation of unstable patterns of cyclic adenosine monophosphate (cAMP) is investigated in the Martiel-Goldbeter (MG) model. This is predicted via a complex Ginzburg-Landau equation, derived from the MG model, under the so-called modulational instability process. Regions of parameters where patterns exist are discussed analytically and verified numerically. Quasi-periodic waves, spiral seeds and chaotic patterns are found to control information driven ...

**Source: **Physics Letters A - November 13, 2019 **Category: **Physics **Source Type: **research

**Interaction stochasticity may hinder cooperation in the spatial public goods game**

Publication date: Available online 7 November 2019Source: Physics Letters AAuthor(s): Shiping Gao, Te Wu, Long WangAbstractWe propose an analytic model to explore the effect of interaction stochasticity on the evolution of cooperation in spatial public goods game. The results show that whether cooperation can dominate in populations crucially depends on the player's probability of opting-out. Stochastic opting-out enhances cooperation as long as the probability of opting-out is less than a threshold depending on the graph's degree. Otherwise the promoting effect of spatial structures on cooperation is hindered even neutral...

**Source: **Physics Letters A - November 12, 2019 **Category: **Physics **Source Type: **research

**Controlling dielectric properties of cBN by an ultrashort double-pulse light**

Publication date: Available online 11 November 2019Source: Physics Letters AAuthor(s): Xiaoshuang Kong, Feng Wang, Xiaoqin Zhang, Zehui Liu, Suna PangAbstractThe optical responses of wide band gap materials can be manipulated by a purposely designed ultrashort double-pulse light, based on the real-time time-dependent density functional theory. Taking the cubic boron nitride (cBN) as a typical example, we calculate the energy transfer from an ultrashort double-pulse light field to dielectric materials. We show that the purposely designed ultrashort double-pulse light and pulse train can reversibly manipulate the dielectric ...

**Source: **Physics Letters A - November 12, 2019 **Category: **Physics **Source Type: **research

**Electronic and transport properties of zigzag phosphorene nanoribbons doped with ordered Si atoms**

Publication date: Available online 11 November 2019Source: Physics Letters AAuthor(s): N. Liu, J.B. Liu, S.L. Wang, K.L. YaoAbstractUsing density functional theory (DFT) and the nonequilibrium Green's function method, we explored the electronic structures and transport properties of zigzag phosphorene nanoribbons (ZPNRs) with ordered doping of Si atoms. Our results show that both pristine and Si-doped ZPNRs exhibit metallic properties and the conductance of the doped ZPNRs nanoribbons can be modulated effectively by changing doping positions and concentrations. As different doping positions, different transmission currents...

**Source: **Physics Letters A - November 12, 2019 **Category: **Physics **Source Type: **research

**Spin dependent electronic transport properties of zigzag black phosphorene nanojunctions induced by H, Li, O, Co asymmetric edge saturations**

Publication date: Available online 11 November 2019Source: Physics Letters AAuthor(s): Aihemaitijiang Sidike, Guanghua Guo, Xiaobo Li, Dongde Li, Yaozhuang Nie, Biaobing Cao, Haiming Duan, Mengqiu LongAbstractTwo-dimensional (2D) material of few-layer black phosphorus (BP) has recently attracted extensive interest owing to its tunable band gap and high carrier mobility. We investigate the electronic transport properties of zigzag black phosphorene nanoribbons (ZBPNRs) with asymmetric H, Li, O and Co edge saturations by employing the density functional theory in combination with the non-equilibrium Green's function. The com...

**Source: **Physics Letters A - November 12, 2019 **Category: **Physics **Source Type: **research