Time-local optimal control for parameter estimation in the Gaussian regime
In this study, we focus on a single bosonic mode subject to a Markovian, thermal master equation, and determine analytically the optimal time-local control of the QFI for its initial squeezing angle (optical phase) and strength. We show that a single initial control operation is already optimal for such cases and quantitatively investigate situations where the optimal control is applied after the open dynamical evolution has begun. (Source: Physics Letters A)
Source: Physics Letters A - January 15, 2020 Category: Physics Source Type: research

Skyrmion size evolution with interlayer exchange coupled ferromagnetic nanostructures
Publication date: Available online 13 January 2020Source: Physics Letters AAuthor(s): Mouad Fattouhi, Moulay Youssef El Hafidi, Mohamed El HafidiAbstractSkyrmions are viewed as the basic elements for the future generation of magnetic memories. Their small sizes and good dynamical properties give them the ability to store and transport information easily. In this paper, we used micromagnetic simulation to study the contribution of interlayer exchange coupling and the geometrical confinement on scaling magnetic skyrmions. We started the work by comparing the utility of interlayer exchange coupling to the perpendicular magnet...
Source: Physics Letters A - January 14, 2020 Category: Physics Source Type: research

(2 + 1)-dimensional Boiti–Leon–Pempinelli equation – Domain walls, invariance properties and conservation laws
Publication date: Available online 9 January 2020Source: Physics Letters AAuthor(s): Gangwei Wang, Jose Vega-Guzman, Anjan Biswas, Abdullah Kamis Alzahrani, A.H. KaraAbstractWe analyze domain wall type solutions, symmetry/invariance properties and conservation laws of the (2+1)-dimensional Boiti–Leon–Pempinelli system which describes the evolution of the horizontal velocity component of water waves propagating in two directions. It turns out that the equation is extensive in these properties. Some domain wall properties are also investigated. (Source: Physics Letters A)
Source: Physics Letters A - January 11, 2020 Category: Physics Source Type: research

Interplay of local resonances and Bragg band gaps in acoustic waveguides with periodic detuned resonators
Publication date: Available online 10 January 2020Source: Physics Letters AAuthor(s): Jiajia Guo, Jianzhi Cao, Yong Xiao, Huijie Shen, Jihong WenAbstractThis letter is concerned with acoustic wave propagation and transmission in acoustic waveguides with periodically grafted detuned Helmholtz resonators. The interplay of local resonances and Bragg band gaps in such periodic systems is examined. It is shown that, when the resonant frequencies of the resonators are tuned close to a Bragg band gap, the behavior of the Bragg band gap can be affected dramatically. Particularly, by introducing appropriately tuned resonators, the ...
Source: Physics Letters A - January 11, 2020 Category: Physics Source Type: research

Periodic and localized structures in a degenerate Thomas-Fermi plasma
Publication date: Available online 10 January 2020Source: Physics Letters AAuthor(s): Ata ur Rahman, Muhammad Khalid, S.N. Naeem, E.A. Elghmaz, S.A. El-Tantawy, L.S. El-SherifAbstractThe propagation of electrostatic ion-acoustic cnoidal waves (IACWs) and solitons in a degenerated electron-positron-ion plasma with cold inertial ions and Thomas Fermi distributed electrons and positrons is investigated. Adopting a reductive perturbation technique (RPT), the Korteweg-de Vries (KdV) equation is obtained and its cnoidal waves (CWs) solution is analyzed. The plasma configuration parameters (namely, the positron concentration and ...
Source: Physics Letters A - January 11, 2020 Category: Physics Source Type: research

Spin effects on the ponderomotive force of EM pulse in magnetized plasmas
Publication date: Available online 11 January 2020Source: Physics Letters AAuthor(s): Qiang-Lin Hu, Xiao-Bing Luo, Gui-Lan Xiao, Shen-Lin ZhouAbstractAn analytic method for analyzing the spin effects of electromagnetic (EM) wave propagating in magnetized plasma along arbitrary direction is proposed. Using this method, the spin perturbation and spin contribution to the ponderomotive force for EM wave propagating perpendicular as well as parallel to the external magnetic field are analyzed. In the case of the EM wave propagating parallel to the external magnetic field, our results are consistent with the results of Ref. [PRL...
Source: Physics Letters A - January 11, 2020 Category: Physics Source Type: research

(2 + 1)-dimensional Boiti–Leon–Pempinelli equation-Domain walls, invariance properties and conservation laws
Publication date: Available online 9 January 2020Source: Physics Letters AAuthor(s): Gangwei Wang, Jose Vega–Guzman, Anjan Biswas, Abdullah Kamis Alzahrani, A.H. KaraAbstractWe analyze domain wall type solutions, symmetry/invariance properties and conservation laws of the (2+1)-dimensional Boiti–Leon–Pempinelli system which describes the evolution of the horizontal velocity component of water waves propagating in two directions. It turns out that the equation is extensive in these properties. Some domain wall properties are also investigated. (Source: Physics Letters A)
Source: Physics Letters A - January 11, 2020 Category: Physics Source Type: research

Duality between the SU(2) lattice gauge model and bosonic t − J model
Publication date: Available online 9 January 2020Source: Physics Letters AAuthor(s): Fei-Jie Huang, Yifen Zhao, Qi-Hui Chen, Yong-Ping FuAbstractWe investigate the duality between the SU(2) lattice gauge model and the bosonic t−J model. We construct the relations between the gauge field operators and particle operators, and map the low-energy regime of the SU(2) lattice gauge model to a U(1) bosonic t−J model coupled with a U(1) gauge field. The mapped model can be interpreted as a bosonic t−J model with particle-hole symmetry, or a mean-field form of the bosonic t−J model with the coexistence of a ...
Source: Physics Letters A - January 11, 2020 Category: Physics Source Type: research

On open boundary conditions for long wave equation in the hodograph plane
Publication date: Available online 10 January 2020Source: Physics Letters AAuthor(s): Baran AydınAbstractWe discuss implications of the seaward boundary conditions used in initial-boundary value problem formulation of nonlinear shallow-water wave propagation over a linear slope. We first demonstrate the reflection of wave velocity in the case of Dirichlet condition and that of water elevation in the case of Neumann condition. We then show that linear superposition of the two boundary conditions results in much less reflection at the artificial boundary. We also propose a new boundary condition of mixed type and compare it...
Source: Physics Letters A - January 11, 2020 Category: Physics Source Type: research

Molecular logic gates based on spin caloritronic transport properties of Mn phthalocyanine nanoribbon
Publication date: Available online 10 January 2020Source: Physics Letters AAuthor(s): Xin-Yi Zhang, Peng ZhaoAbstractBased on the density functional theory along with nonequilibrium Green's function technique, we investigate the spin caloritronic transport properties of ferromagnetic one-dimensional Mn phthalocyanine nanoribbon under different magnetic configurations. The results demonstrate the thermally-driven spin-dependent currents depend strongly on the choice of magnetic configuration. The underlying mechanism is analyzed by the Fermi-Dirac distribution function, spin-resolved transmission spectra, band structures an...
Source: Physics Letters A - January 11, 2020 Category: Physics Source Type: research

Editors
Publication date: 28 February 2020Source: Physics Letters A, Volume 384, Issue 6Author(s): (Source: Physics Letters A)
Source: Physics Letters A - January 9, 2020 Category: Physics Source Type: research

Phase investigation and crystal structure analysis of zinc stannate (Zn2SnO4)
Publication date: Available online 7 January 2020Source: Physics Letters AAuthor(s): Runjiang Guo, Hua Li, Hezhou LiuAbstractThe space group of zinc stannate (Zn2SnO4) synthesized by one-pot hydrothermal method was often thought to be Fd3m. However, we observed the presence of (200) and (420) diffraction planes via X-ray diffraction and selected area electron diffraction patterns which are forbidden in Fd3m but allowed in F4¯3m. So we declared that the as-produced nano-sized Zn2SnO4 in the previous literatures had F4¯3m space group rather than Fd3m. The main difference between these two space groups is that for s...
Source: Physics Letters A - January 8, 2020 Category: Physics Source Type: research

Reputation-based co-evolutionary model promotes cooperation in prisoner's dilemma game
Publication date: Available online 7 January 2020Source: Physics Letters AAuthor(s): Yudong Gong, Sanyang Liu, Yiguang BaiAbstractIndirect reciprocity is a fascinating topic in the field of social cooperation. In this paper, we propose a novel updating strategy based on the critical reputation-aware calculation. The joint of reputation allows players to make decisions not only on current payoffs but also from a third party, which improves the status of cooperators in the prisoner's dilemma game and provides a possibility for surviving. Experiments show that the discrepancies in initial fitness caused by reputation will sup...
Source: Physics Letters A - January 8, 2020 Category: Physics Source Type: research

A compact sharp-edge wide bandpass near-infrared filter based on graded-index sinusoidally corrugated photonic crystal
In this study, a wide-bandpass near-infrared filter is devised based on a novel sinusoidally corrugated multilayer structure. The presented structure exhibits a wider bandpass and higher average transmission amplitude than the conventional triangular design. Cut-on frequency of the proposed bandpass filter can be tuned by the variation of horizontal lattice constant. Thus it can be applied as a tunable multichannel filter. Particle swarm optimization procedure was carried out to find the optimal arrangement of dielectric materials to eliminate the undesired fluctuations in the transmission spectrum at the beginning of the ...
Source: Physics Letters A - January 8, 2020 Category: Physics Source Type: research

Controlling self-Kerr nonlinearity with an external magnetic field in a degenerate two-level inhomogeneously broadened medium
Publication date: Available online 8 January 2020Source: Physics Letters AAuthor(s): Nguyen Huy Bang, Dinh Xuan Khoa, Le Van DoaiAbstractThe magnitude and sign of self-Kerr nonlinear coefficient in a degenerate two-level inhomogeneously broadened medium are simply controlled by an external magnetic field. By changing the external magnetic field we can switch a negative peak of Kerr nonlinear coefficient into a positive peak and vice versa, and transform a zero value of Kerr nonlinear coefficient into a positive or negative peak in resonant region. Such a controllable Kerr nonlinear coefficient can be used to manipulate the...
Source: Physics Letters A - January 8, 2020 Category: Physics Source Type: research

Splitting of coupled bright solitons in two-component Bose-Einstein condensates under parametric perturbation
Publication date: Available online 8 January 2020Source: Physics Letters AAuthor(s): M.O.D. Alotaibi, B.B. Baizakov, S.M. Al-Marzoug, H. BahlouliAbstractWe analyze the dynamics of bright-bright solitons in two-component Bose-Einstein condensates (BECs) subject to parametric perturbations using the variational approach and direct numerical simulations. The system is described by a vector nonlinear Schrödinger equation (NLSE) appropriate to coupled multi-component BECs. A periodic variation of the inter-component coupling coefficient is used to explore nonlinear resonances and splitting of the coupled bright solitons. T...
Source: Physics Letters A - January 8, 2020 Category: Physics Source Type: research

Conservation laws of some classes of models involving oscillons
Publication date: Available online 6 January 2020Source: Physics Letters AAuthor(s): A.F. Aljohani, A.H. KaraAbstractIn this paper, we construct and analyse the conservation laws (conserved densities) of two models that lead to oscillons; viz., in a system of two nonlinearly coupled scalar fields in (1+1)-dimensional spatiotemporal continuum' and analysed a particular class of sixth-degree polynomial potentials and one in which an interaction of ‘two one-dimensional spatial vector oscillons in a trap with significant transverse dimensions’ occur. (Source: Physics Letters A)
Source: Physics Letters A - January 8, 2020 Category: Physics Source Type: research

Kapitza resistance in basic chain models with isolated defects
Publication date: Available online 6 January 2020Source: Physics Letters AAuthor(s): Jithu Paul, O.V. GendelmanAbstractWe explore numerically the boundary Kapitza resistance in one-dimensional chain models with isotopic and/or coupling defects for variety of the inter-particle potentials. In linear models, the Kapitza resistance is well-defined and size-independent (contrary to the bulk heat conduction coefficient), but depends on the parameters of thermostats used in the simulation. For β-FPU model one also encounters the dependence on the thermostats; in addition, the simulated boundary resistance strongly depends o...
Source: Physics Letters A - January 8, 2020 Category: Physics Source Type: research

Study on the properties of Pb(Zr,Ti)O3 thin films grown alternately by pulsed laser deposition and sol-gel method
Publication date: Available online 6 January 2020Source: Physics Letters AAuthor(s): Peng Shi, Yan Yang, Huisen Li, Zhiqiu Zou, Benpeng Zhu, Yue Zhang, Jun Ou-Yang, Shi Chen, Xiaofei YangAbstractIn order to prepare good quality Pb(Zr,Ti)O3 (PZT) thin films, we consider the method of alternately growing PZT thin films on Pt (111)/Ti/SiO2/Si (100) substrates by pulsed laser deposition (PLD) and sol-gel. In this work, we conducted comparative experiments on different film preparation methods, and 1.0 um thick PZT film was grown on platinized silicon wafers by an alternate PLD and sol-gel method. The microstructure and electri...
Source: Physics Letters A - January 8, 2020 Category: Physics Source Type: research

Chimera states in globally coupled sine circle map lattices: Spatiotemporal intermittency and hyperchaos
Publication date: Available online 6 January 2020Source: Physics Letters AAuthor(s): Joydeep Singha, Neelima GupteAbstractChimera states with coexisting phase synchronised and desynchronised groups are seen in a globally coupled sine circle map lattice with distinct values of intergroup and intragroup coupling, at some parameters. Structures similar to spatiotemporally intermittent regions, are seen in the desynchronised group. These states exhibit hyperchaos. Other states seen include fully synchronised/desynchronised states and two cluster states. The phase diagram of the system is obtained using complex order parameters...
Source: Physics Letters A - January 8, 2020 Category: Physics Source Type: research

A simple study of the correlation effects in the superposition of waves of electric fields: The emergence of extreme events
Publication date: Available online 6 January 2020Source: Physics Letters AAuthor(s): Roberto da Silva, Sandra D. PradoAbstractIn this paper, we study the effects of correlated random phases in the intensity of a superposition of N wavefields. Our results suggest that regardless of whether the phase distribution is continuous or discrete if they are random correlated variables, we will observe a denser tail distribution and the emergence of extreme events (amplitudes 30-40 times larger than their average) as the phases correlation increase. Recent results in the literature discuss the role of phase correlations on the emerg...
Source: Physics Letters A - January 8, 2020 Category: Physics Source Type: research

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