Green's function formulation of multiple nonlinear Dirac δ-function potential in one dimension
Publication date: Available online 6 January 2020Source: Physics Letters AAuthor(s): Fatih Erman, Haydar UncuAbstractIn this work, we study the scattering problem of the general nonlinear finitely many Dirac delta potentials with complex coupling constants (or opacities in the context of optics) using the Green's function method and then find the bound state energies and the wave functions for the particular form of the nonlinearity in the case of positive real coupling constants. (Source: Physics Letters A)
Source: Physics Letters A - January 8, 2020 Category: Physics Source Type: research

The spin-dependent transport properties of endohedral transition-metal-fullerene X@C66H4 (X=Fe, Co, Mn, Ni)†
Publication date: Available online 6 January 2020Source: Physics Letters AAuthor(s): Jian-Hua Li, Yan-Dong Guo, Hong-Li Zeng, Jing-Jing He, Yang Ni, Qiao-An Li, Xiao-Hong YanAbstractInspired by recent experiments on the successful synthesis of hydrofullerene C66H4 in Tian et al. (2019) [12] with two negatively curved heptagons. Based on the density functional theory and nonequilibrium Green's function method, we report the spin-dependent transport through transition-metal-atom-encapsulated C66H4 hydrofullerene, i.e., X@C66H4(X=Fe, Co, Mn, Ni), contacted by single gold atoms via semi-infinite non-magnetic Au electrodes. It ...
Source: Physics Letters A - January 8, 2020 Category: Physics Source Type: research

Broadband high-efficiency controllable asymmetric propagation by pentamode acoustic metasurface
Publication date: Available online 7 January 2020Source: Physics Letters AAuthor(s): Yangyang Chu, Zhaohong Wang, Zhuo XuAbstractWe utilise the pentamode metasurface to realise broadband high-efficiency and controllable asymmetric transmission. The designed metasurface can manipulate the acoustic waves, as expected from the generalised Snell's law, and exhibits unique characteristics such as extraordinary broadband acoustic control, apparent negative refraction, and conversion from the propagating wave to surface mode. The asymmetric transmission features of positive refraction for the forward incidence (FI) and negative r...
Source: Physics Letters A - January 8, 2020 Category: Physics Source Type: research

Perspectives of Electrically generated spin currents in ferromagnetic materials
Publication date: Available online 7 January 2020Source: Physics Letters AAuthor(s): Angie Davidson, Vivek P. Amin, Wafa S. Aljuaid, Paul M Haney, Xin FanAbstractSpin-orbit coupling enables charge currents to give rise to spin currents and vice versa, which has applications in non-volatile magnetic memories, miniature microwave oscillators, thermoelectric converters and Terahertz devices. In the past two decades, a considerable amount of research has focused on electrical spin current generation in different types of nonmagnetic materials. However, electrical spin current generation in ferromagnetic materials has only rece...
Source: Physics Letters A - January 8, 2020 Category: Physics Source Type: research

A special triple point in non-centrosymmetric materials Zn3In2Se6 and In2Se3
Publication date: Available online 3 January 2020Source: Physics Letters AAuthor(s): Yinxiang Li, Congcong Le, Qiubo Cheng, Yuge Chen, Bin ChenAbstractWe predict that the non-centrosymmetric materials Zn3In2Se6 and In2Se3 are the symmetry protected topological critical triple point metals based on first principles calculation. The dispersion along the Γ-Z line almost vanishes because of the particular crystal structure, and the strain along the c direction maybe drives accidental Dirac point to triple point. An effective theory is developed to describe accidental Dirac points and triple points, by which we calculate ...
Source: Physics Letters A - January 5, 2020 Category: Physics Source Type: research

Plasmon modes in double-layer gapped graphene at zero temperature
Publication date: Available online 3 January 2020Source: Physics Letters AAuthor(s): Nguyen Van Men, Dong Thi Kim PhuongAbstractPlasmon dispersions and damping rate of plasma oscillations in a double-layer gapped graphene made of two parallel mono layer gapped graphene sheets grown on dielectric separation are calculated within random-phase-approximation at zero temperature. By using long wavelength limit expansion, analytical expressions for optical and acoustic plasmon frequencies have been formed, and the formulae demonstrate that the considerable difference in analytical form for plasmon frequencies comes from the fact...
Source: Physics Letters A - January 5, 2020 Category: Physics Source Type: research

Thermoelectric properties of monolayer α-Te: Low lattice thermal conductivity and extremely high dimensionless figure of merit
Publication date: Available online 3 January 2020Source: Physics Letters AAuthor(s): Xia Jiang, Lin Zhu, Bowen Li, Kailun YaoAbstractWe have investigated the thermoelectric properties of monolayer α-Te by the first-principles and the Boltzmann transport theory. The results show that monolayer α-Te is an indirect bandgap semiconductor with a moderate bandgap of 0.63 eV. The value of the Seebeck coefficient for monolayer α-Te is larger than 200 μVK−1, the electrical conductivity has the magnitude of 1×106. The lattice thermal conductivity is smaller than 4 Wm−1K−1, which is extrem...
Source: Physics Letters A - January 5, 2020 Category: Physics Source Type: research

Two-photon selective excitation of phonon-mode in diamond using mid-infrared free-electron laser
Publication date: Available online 3 January 2020Source: Physics Letters AAuthor(s): Oji Sato, Kyohei Yoshida, Heishun Zen, Kan Hachiya, Takuya Goto, Takashi Sagawa, Hideaki OhgakiAbstractTwo-photon selective excitation of an infrared (IR)-inactive phonon mode by a mid-infrared tunable free-electron laser (FEL) was accomplished. The mode-selective phonon excitation of IR-active mode by one-photon excitation using FEL (Yoshida et al. (2013) [20]) was extended to the IR-inactive mode excitation. The T2g optical phonon mode in single-crystal diamond at 1,332cm−1 was selected, and the FEL photon energy corresponding to t...
Source: Physics Letters A - January 5, 2020 Category: Physics Source Type: research

Estimating critical surface tension from droplet spreading area
Publication date: Available online 3 January 2020Source: Physics Letters AAuthor(s): Yukihiro Yonemoto, Tomoaki KunugiAbstractCritical surface tension (CST) is a measure of solid surface tension and is mainly determined by measuring the contact angle of a droplet on a target solid surface. The concept of CST makes it possible to determine solid surface tension without any unprovable assumptions such as the Fowkes hypothesis. However, it requires somewhat special devices and skills for measuring the contact angle. In this work, we propose a simple method to determine the CST of a solid by measuring the droplet spreading are...
Source: Physics Letters A - January 5, 2020 Category: Physics Source Type: research

Diffraction mode selection in planar Bragg resonators of optical and microwave wavelength ranges
Publication date: Available online 3 January 2020Source: Physics Letters AAuthor(s): N.S. Ginzburg, A.S. Sergeev, E.R. Kocharovskaya, A.M. Malkin, E.D. Egorova, V.Yu. ZaslavskyAbstractUsing the coupled waves approach complemented by the time-domain quasi-optical approximation, we solve a 2D diffraction problem which allows to evaluate the eigenfrequencies, quality factors and spatial structures of eigenmodes in planar Bragg resonators with a finite length and width of the corrugated area. We find the values of the Fresnel parameter determined by the geometrical dimensions of the system which allows for efficient transverse...
Source: Physics Letters A - January 5, 2020 Category: Physics Source Type: research

Roles of different update strategies in the vaccination behavior on two-layered networks
Publication date: Available online 3 January 2020Source: Physics Letters AAuthor(s): Xinyu Wang, Shupeng Gao, Peican Zhu, Juan WangAbstractEpidemic spreading has been widely investigated over the past decades. And voluntary vaccination has been often utilized to explore dynamical process in epidemics where vaccines are available. In this letter, we establish a framework considering conformity motivated update as well as myopic best response motivated update on a family network which is demonstrated by a two-layered network. Extensive numerical simulations are conducted to study the dynamics of epidemic spreading under the ...
Source: Physics Letters A - January 5, 2020 Category: Physics Source Type: research

The application of artificial neural-network potentials for flexoelectricity: Performance for anatase-type TiO2
Publication date: Available online 3 January 2020Source: Physics Letters AAuthor(s): Lin Xiang, Xiaoqin Zeng, Xiaokun Huang, Guannan LiAbstractFlexoelectric effect (FxE) arising from coupling between electric polarization and strain-gradient is a long-range interactions. To theoretically obtain accurate flexoelectric coefficient, density functional theory (DFT) method is usually applied to calculate large-scale supercell, which requires massive computational resource. Artificial neural network (ANN) representation of DFT potential-energy surfaces should yield substantial savings in computational resource. Nevertheless, it ...
Source: Physics Letters A - January 5, 2020 Category: Physics Source Type: research

Quantum computing cryptography: Finding cryptographic Boolean functions with quantum annealing by a 2000 qubit D-wave quantum computer
Publication date: Available online 3 January 2020Source: Physics Letters AAuthor(s): Feng Hu, Lucas Lamata, Mikel Sanz, Xi Chen, Xingyuan Chen, Chao Wang, Enrique SolanoAbstractAs the building block in symmetric cryptography, designing Boolean functions satisfying multiple properties is an important problem in sequence ciphers, block ciphers, and hash functions. However, the search of n-variable Boolean functions fulfilling global cryptographic constraints is computationally hard due to the super-exponential size O(22n) of the space. Here, we introduce a codification of the cryptographically relevant constraints in the gro...
Source: Physics Letters A - January 5, 2020 Category: Physics Source Type: research

Rogue wave solutions of the vector Lakshmanan–Porsezian–Daniel equation
Publication date: Available online 3 January 2020Source: Physics Letters AAuthor(s): Yanlin Ye, Chong Hou, Dandan Cheng, Shihua ChenAbstractWe use a nonrecursive Darboux transformation method to obtain a special hierarchy of rogue wave solutions of the vector Lakshmanan–Porsezian–Daniel equation, which can govern the propagation of ultrashort optical pulses in a long-haul telecommunication fiber. In terms of the exact rational solutions, we demonstrate several interesting rogue wave dynamics such as rogue wave doublets, quartets and sextets. The modulation instability responsible for the excitation of rogue wav...
Source: Physics Letters A - January 5, 2020 Category: Physics Source Type: research

Editors
Publication date: 17 February 2020Source: Physics Letters A, Volume 384, Issue 5Author(s): (Source: Physics Letters A)
Source: Physics Letters A - January 3, 2020 Category: Physics Source Type: research

Origin of large spin Hall magnetoresistance in Fe/CuOx bilayers
Publication date: Available online 31 December 2019Source: Physics Letters AAuthor(s): S.Q. Zheng, K.K. Meng, Q.B. Liu, Y.C. Wu, J. Miao, X.G. Xu, Y. JiangAbstractWe have compared the spin Hall magnetoresistance (SMR) in Fe/Pt and Fe/CuOx (with natural oxidation) bilayers with varying the thickness of Fe layer. A larger SMR in Fe/CuOx bilayers has been found when the thickness of Fe layer is 3 nm. Moreover, the SMR of the two bilayers decrease with increasing the thickness of Fe from 3 nm to 10 nm, but that of Fe/CuOx drops more sharply due to shunting current effect. Through harmonic measurements, the emergent spin curren...
Source: Physics Letters A - January 2, 2020 Category: Physics Source Type: research

Optical properties and electromagnetically induced grating in a hybrid semiconductor quantum dot-metallic nanorod system
Publication date: Available online 30 December 2019Source: Physics Letters AAuthor(s): Tayebeh NaseriAbstractAn artificial molecule consisting of an SQD and an MNR embedded in 3D photonic crystal is proposed to realize EIG. Using the quantum mechanical density matrix approach, we have derived an expression of the absorption coefficient in the SQD in presence of MNR. Nanoparticle geometry can modify the local fields that determine SQD-MNP coupling and to engineer the hybrid optical response. The probe absorption is reduced via a strong coupling field, demonstrating spectral transparency window. It is worth noting that the b...
Source: Physics Letters A - January 1, 2020 Category: Physics Source Type: research

Editors
Publication date: 6 February 2020Source: Physics Letters A, Volume 384, Issue 4Author(s): (Source: Physics Letters A)
Source: Physics Letters A - January 1, 2020 Category: Physics Source Type: research

A non-Hermitian quantum approach to reliability of a two-state system
Publication date: Available online 27 December 2019Source: Physics Letters AAuthor(s): Kunsong Lin, Jiaxiao Zhu, Yunxia ChenAbstractWe explore the concept of the reliability theory in the quantum domain, by giving a Hilbert structure to the system states, then utilize a non-Hermitian Schrodinger equation to describe the state evolution and finally derive two new lifetime distributions. Beyond this, the alternative density matrix approach implies that the degradation term can be separated into two parts, one only related to the system properties and the other only influenced by the environment. Applications on six real data...
Source: Physics Letters A - December 29, 2019 Category: Physics Source Type: research

Optical solitons with Chen–Lee–Liu equation by Lie symmetry
Publication date: Available online 18 December 2019Source: Physics Letters AAuthor(s): Anupma Bansal, Anjan Biswas, Qin Zhou, Saima Arshed, Abdullah Kamis Alzahrani, Milivoj R. BelicAbstractThis paper avails of classical Lie symmetry analysis to exhibit optical solitons to Chen–Lee–Liu model. By the aid of the proposed method, we secure symmetries that transform the model to a system of ordinary differential equations which are subsequently investigated by a number of methods to recover bright, dark and singular solitons. (Source: Physics Letters A)
Source: Physics Letters A - December 19, 2019 Category: Physics Source Type: research

Modeling the strain rate-dependent constitutive behavior in nanotwinned polycrystalline metals
Publication date: Available online 19 December 2019Source: Physics Letters AAuthor(s): Zizheng Guo, Kai Wu, Haihui Ruan, Linli ZhuAbstractExperimental studies have demonstrated that both strain rate and temperature influence the mechanical behavior of nanostructured metals significantly. In this work, a theoretical model is developed to describe the strain-rate-dependent constitutive behavior of nanotwinned polycrystalline metals. The athermal flow stress and thermal-activated flow stress are both considered in modeling the plastic deformation of a nanotwinned metal. Numerical results are consistent with the experimental r...
Source: Physics Letters A - December 19, 2019 Category: Physics Source Type: research

Deterministic remote preparation of arbitrary single-qubit state via one intermediate node in noisy environment
Publication date: Available online 17 December 2019Source: Physics Letters AAuthor(s): Ying-jia Qian, Shi-bei Xue, Min JiangAbstractWe propose a remote state preparation scheme working in noisy environment via one intermediate node. Firstly, we report the remote preparation of an arbitrary single-qubit state with one intermediate node in ideal environment. Afterwards, we investigate the influence of four kinds of representative noises that are commonly encountered in practical applications of quantum communication protocols. Detailed analysis indicates that the fidelities of the output state rely on the coefficients of the...
Source: Physics Letters A - December 18, 2019 Category: Physics Source Type: research

Variational calculations for relativistic two dimensional strongly interacting fermions: Application to 2D liquid 3He
Publication date: Available online 16 December 2019Source: Physics Letters AAuthor(s): H. Salehi, M. Mohammadi Sabet, S. MizaniAbstractIn this paper, a variational method has been used to investigate the properties of two dimensional (2D) strongly interacting fermions. As an application, the results have been applied to 2D liquid H3e as a real fermionic system. We showed that this variational method, known as lowest order constrained variational method, can be used to relativistic 2D fermionic systems with a good accuracy. We proved that different features of a relativistic many body system can be studied without solving D...
Source: Physics Letters A - December 17, 2019 Category: Physics Source Type: research

Dynamics of driven Brownian inverted oscillator
We describe the influence of an arbitrary time-dependent force on an open inverted oscillator dynamics. We take into account environment through the integral operator of relaxation and the force correlation function. The resulting behavior of the system is represented as a combination the time evolution of the position expectation and the variance, being induced simultaneously by spreading the wave packet and the chaotic Brownian motion. We discuss the possibility of stabilization of an open inverted oscillator, when applying external alternating force. (Source: Physics Letters A)
Source: Physics Letters A - December 14, 2019 Category: Physics Source Type: research

Nondegenerate soliton solutions in certain coupled nonlinear Schrödinger systems
Publication date: Available online 14 December 2019Source: Physics Letters AAuthor(s): S. Stalin, R. Ramakrishnan, M. LakshmananAbstractIn this paper, we report a more general class of nondegenerate soliton solutions, associated with two distinct wave numbers in different modes, for a certain class of physically important integrable two component nonlinear Schrödinger type equations through bilinearization procedure. In particular, we consider coupled nonlinear Schrödinger (CNLS) equations (both focusing as well as mixed type nonlinearities), coherently coupled nonlinear Schrödinger (CCNLS) equations and lon...
Source: Physics Letters A - December 14, 2019 Category: Physics Source Type: research

The evolution of cooperation within the multigame environment based on the Particle Swarm Optimization algorithm
Publication date: Available online 12 December 2019Source: Physics Letters AAuthor(s): Xianjia Wang, Wenman Chen, Jinhua ZhaoAbstractThis paper studies the evolution of cooperation in a so-called multigame environment based on the Particle Swarm Optimization (PSO) algorithm. In a multigame environment, players use different game payoff matrices and acquire their utilities from their interactions with their neighbors. According to the PSO algorithm, each player updates its strategy according to both the strategy adopted by the player with the highest utility in its neighborhood and the most profitable strategy in their own ...
Source: Physics Letters A - December 14, 2019 Category: Physics Source Type: research

Physical properties of Pb doped ZnS thin films prepared by ultrasonic spray technique
Publication date: Available online 12 December 2019Source: Physics Letters AAuthor(s): A. Attaf, A. Derbali, H. Saidi, H. Benamra, M.S. Aida, N. Attaf, H. Ezzaouia, L. DerbaliAbstractIn the present work, high quality Pb doped ZnS thin films were deposited on glass substrates at 450°C using spray ultrasonic technique. The dependence of the structural, morphological and optical properties of the films on the lead (Pb) doping amount was investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), UV–vis–NIR spectrophotometry, and four-point method. The improvement of the obtained Pb:Zn...
Source: Physics Letters A - December 14, 2019 Category: Physics Source Type: research

High spin-filtering and magnetoelectric properties of one-dimensional transition metal.bis(dithiolene) structures
Publication date: Available online 12 December 2019Source: Physics Letters AAuthor(s): Niloofar Saeedzadeh Khaanghah, H. Rahimpour Soleimani, Zahra GolsanamlouAbstractThe electric, magnetic and transport properties of new one dimensional π-conjugated transition metal.bis.dithiolene (1D-TM.b.DT) structures, were investigated based on density functional theory (DFT) and nonequilibrium Green's function formalism (NEGF). Mn, Co and Ni atoms are considered as TMs in the 1D-TM.b.DT structures. The three 1D-TM.b.DT structures are found to be in square planar geometry. dx2−y2 and dz2 orbitals of the considered TMs remain ...
Source: Physics Letters A - December 14, 2019 Category: Physics Source Type: research

Stability and superconductivity of TiPHn (n = 1−8) under high pressure
Publication date: Available online 12 December 2019Source: Physics Letters AAuthor(s): Xue Guo, Ru-Lin Wang, Hai-Liang Chen, Wen-Cai Lu, K.M. Ho, C.Z. WangAbstractTitanium exhibits high affinity to hydrogen and the Ti-H compounds are thermodynamically stable. We introduced the Ti elements in the P-H compounds to deal with the thermodynamic-instability issue of the P-H compounds. In this work, ternary hydrogen-rich compounds TiPHn (n = 1-8) were studied and calculated using the density function theory (DFT) method. The results showed that the TiPH4 and TiPH8 had high superconducting critical temperatures (Tc) as well as bet...
Source: Physics Letters A - December 14, 2019 Category: Physics Source Type: research

Photon-assisted PT symmetry and stability of two strongly interacting bosons in a non-Hermitian driven double well
Publication date: Available online 12 December 2019Source: Physics Letters AAuthor(s): Zheng Zhou, Zixiang Wang, Honghua Zhong, Yunrong Luo, Hao Chen, Jintao TanAbstractWe investigate how the driving field and strong interatomic interaction affect the parity-time (PT) symmetry and stability of two interacting bosons in a non-Hermitian double-well system by means of a multiple-time-scale asymptotic analysis. In contrast to the usually PT-symmetric case without the driving, for which the interatomic interaction always break the PT symmetry, we show that photon resonance can assist PT symmetry when a nearly-resonant condition...
Source: Physics Letters A - December 14, 2019 Category: Physics Source Type: research

Bell-type polarization experiment with pairs of uncorrelated optical photons
We present a Bell-type polarization experiment using two independent sources of polarized optical photons, and detecting the temporal coincidence of pairs of uncorrelated photons which have never been entangled in the apparatus. Very simply, our measurements have tested the quantum-mechanical equivalent of the classical Malus' law on an incoherent beam of polarized photons obtained from two separate and independent laser sources greatly reduced in intensities. The outcome of the experiment gives evidence of violation of the Bell-like inequalities. Drawing the conclusions of the present work, we invoke the distinction betwe...
Source: Physics Letters A - December 14, 2019 Category: Physics Source Type: research

Optical solitons for Radhakrishnan–Kundu–Lakshmanan equation with full nonlinearity
Publication date: Available online 11 December 2019Source: Physics Letters AAuthor(s): Saima Arshed, Anjan Biswas, Padmaja Guggilla, Ali Saleh AlshomraniAbstractThis paper retrieves bright, dark, singular and dark–singular combo dispersive optical solitons that stem from Radhakrishnan–Kundu–Lakshmanan model which is studied with full nonlinearity. These solitons are listed with constraint conditions on their parameters which serve as their existence criteria. Two strategically sound integration schemes have made soliton recovery successful. (Source: Physics Letters A)
Source: Physics Letters A - December 13, 2019 Category: Physics Source Type: research

Tailoring electronic and transport properties of edge-terminated armchair graphene by defect formation and N/B doping
Publication date: Available online 11 December 2019Source: Physics Letters AAuthor(s): Nabajyoti Baildya, Narendra Nath Ghosh, Asoke P. ChattopadhyayAbstractFirst principle calculations based on Density Functional Theory and nonequilibrium Green's function methods were carried out on a p-n junction device made of armchair graphene nanoribbons (GNR), with B and N doping and with defects, to examine transport properties of these systems. Doping and defects were found to lower band gap compared to pristine GNR. N-doping leads to the smallest band gap and the highest current (17.18 μA at 0.9 V bias, −12.82 μA at &m...
Source: Physics Letters A - December 13, 2019 Category: Physics Source Type: research

Electrical switching effect in a photochromic molecule between two graphene electrodes
Publication date: Available online 11 December 2019Source: Physics Letters AAuthor(s): Feng-Xia Zu, Fu-Chun Zhang, Dong Wang, Yun Ni, Shu-Ling Wang, Chun-Ling Ding, Guo-ying GaoAbstractWe propose a single-molecule electrical switches consisting of a photochromic dimethyldihydropyrene/cyclophanediene molecule sandwiched between two graphene electrodes and investigate the electronic transport by using density-functional theory and nonequilibrium Green's function methods. The “open” and “closed” isomers of the photochromic molecule are shown to have electrical switching behavior and negative differenti...
Source: Physics Letters A - December 13, 2019 Category: Physics Source Type: research

Quantum Stochastic Walk models for quantum state discrimination
Publication date: Available online 11 December 2019Source: Physics Letters AAuthor(s): Nicola Dalla Pozza, Filippo CarusoAbstractQuantum Stochastic Walks (QSW) allow for a generalization of both quantum and classical random walks by describing the dynamic evolution of an open quantum system on a network, with nodes corresponding to quantum states of a fixed basis. We consider the problem of quantum state discrimination on such a system, and we solve it by optimizing the network topology weights. Finally, we test it on different quantum network topologies and compare it with optimal theoretical bounds. (Source: Physics Letters A)
Source: Physics Letters A - December 13, 2019 Category: Physics Source Type: research

Open multistate Majorana model
Publication date: Available online 11 December 2019Source: Physics Letters AAuthor(s): Benedetto Militello, Nikolay V. VitanovAbstractThe Majorana model in the presence of dissipation and dephasing is considered. First, it is proven that increasing the Hilbert space dimension the system becomes more and more fragile to quantum noise, whether dephasing or dissipation are mainly present. Second, it is shown that, contrary to its ideal counterpart, the dynamics related to the open Majorana model cannot be considered as the combined dynamics of a set of independent spin-1/2 models. (Source: Physics Letters A)
Source: Physics Letters A - December 13, 2019 Category: Physics Source Type: research

Anisotropic collapse in three-dimensional dipolar Bose-Einstein condensates
Publication date: Available online 6 December 2019Source: Physics Letters AAuthor(s): Boaz Ilan, Jessica TaylorAbstractWe study the (3+1)-dimensional Gross-Pitaevskii / Nonlinear Schrödinger equation describing a dipolar Bose-Einstein condensate. Bound states are computed using accurate numerical techniques. When the dipolar strength is negative, the total number of atoms vs. frequency relationship for these bound states is multi-valued and possesses a cusp point, which corresponds to a “candlestick” ground state. Direct simulations of this ground state exhibit strongly-anisotropic collapse of its nucleus,...
Source: Physics Letters A - December 7, 2019 Category: Physics Source Type: research

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