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

The ground state and the tunnelling dynamics of the Bose-Einstein condensate in a tilted shallow trap
Publication date: Available online 11 November 2019Source: Physics Letters AAuthor(s): Yue Jian, Xin Qiao, Yan-Chao Zhang, Ai-Xia Zhang, Ju-Kui XueAbstractThe ground state and the tunnelling dynamics of the Bose-Einstein condensate (BEC) loaded in a tilted shallow trap is studied analytically and numerically. The stable bound state, the quasi-bound state and the diffusion state are predicted. The thresholds for transition between the different states are obtained and the stability diagram in parameter space is presented. The tunnelling dynamics of the system in different states is revealed. The shape of the potential well ...
Source: Physics Letters A - November 12, 2019 Category: Physics Source Type: research

Amantadine antiparkinsonian drug adsorption on the AlN and BN nanoclusters: A computational study
Publication date: Available online 11 November 2019Source: Physics Letters AAuthor(s): Xianghong Sun, Xiaona Wan, Guichen Li, Jing Yu, Vahid VahabiAbstractTo find a sensor for Amantadine (AM) antiparkinsonian drug, we studied its interaction with Al12N12 and B12N12 nanoclusters by density functional theory calculations. The AM molecule attaches via its –NH2 group to the Al or B atoms of Al12N12 or B12N12 with Gibbs free energy change about −31.5 or −26.1 kcal/mol. Increasing the AM concentration, the interaction becomes weaker due to steric effects. The AM adsorbs on the Al12N12 and B12N12 with two differ...
Source: Physics Letters A - November 12, 2019 Category: Physics Source Type: research

Different indicators for Markovian and non-Markovian dynamics
Publication date: Available online 11 November 2019Source: Physics Letters AAuthor(s): K. El Anouz, A. El Allati, N. MetwallyAbstractThe Markovianity/non-Markovianity of two different systems are discussed by means of the quantum speed limit time and quantum Fisher information. The first system is described by a central mass particle interacts locally with its surrounding particles, while the second and third models consist of a single qubit interacts with a non-detuning Lorentzian cavity and with a thermal reservoir, respectively. For the first model, the large distance between the central particle and the surrounding par...
Source: Physics Letters A - November 12, 2019 Category: Physics Source Type: research

Unfolding pathway and its identifiability in heterogeneous chains of bistable units
Publication date: Available online 9 November 2019Source: Physics Letters AAuthor(s): Manon Benedito, Stefano GiordanoAbstractWe investigate the behavior of a chain of bistable units with an heterogeneous distribution of energy jumps between the folded and unfolded states. For homogeneous chains, loaded by soft or hard devices, all units at each switching occurrence have the same probability to unfold and it is therefore impossible to identify an unfolding pathway. Conversely, the heterogeneity represents a quenched disorder from the statistical mechanics point of view, and is able to break the symmetry eventually generati...
Source: Physics Letters A - November 9, 2019 Category: Physics Source Type: research

The role of spin-orbit coupling on the electronic structure properties of non-centrosymmetric La7Ir3 superconductor
Publication date: Available online 7 November 2019Source: Physics Letters AAuthor(s): M. Sahakyan, V.H. TranAbstractWe have carried out the first-principles calculations of the electronic band structure properties of weakly electron correlated, non-centrosymmetric La7Ir3 superconductor (Tc = 2.25 K). We have utilized the GGA-PBE exchange-correlation functionals, implemented in the FP-LAPW ELK code to determine Electronic bands, Densities of States, Fermi surfaces and Electron localization functions. A comparative analysis of scalar relativistic and fully relativistic results reveals the presence of both asymmetric spin - o...
Source: Physics Letters A - November 9, 2019 Category: Physics Source Type: research

Interaction stochasticity may hinder cooperation in 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 9, 2019 Category: Physics Source Type: research

Frequency dependent hyperpolarizability and two photon excitations in hydrogen atom confined under classical plasma environment
Publication date: Available online 7 November 2019Source: Physics Letters AAuthor(s): Sukhamoy Bhattacharyya, Prasanta K. Mukherjee, Burkhard FrickeAbstractFrequency dependent dipole hyperpolarizability of hydrogen atom confined under classical plasma is estimated using nonlinear response theory under a monochromatic electromagnetic field. The screened Coulomb potential is used to model the classical plasma. Time-dependent variation perturbation theory with Slater basis is applied for the first time for such an analysis. As an offshoot, two photon excitations are obtained from the poles of frequency dependent hyperpolariza...
Source: Physics Letters A - November 9, 2019 Category: Physics Source Type: research

Effects of Co content on microstructure and magnetic property of Fe81-xCoxZr7Mo2B9M1(M=Ge/Cu) alloys
Publication date: Available online 7 November 2019Source: Physics Letters AAuthor(s): Wanqiu Yu, Liping Lu, Zhong HuaAbstractFe80-xCoxZr7Mo2B10M1(x=10, 20, 30, 40; M=Cu/Ge) amorphous alloy ribbons prepared by melt spinning were annealed at crystallization peak temperatures. The crystallization peak temperature decreases with increasing Co content. The primary crystallization phase of all alloys is only α-Fe(Co) phase. The effects of Co content on grain size (D) and coercivity (Hc) of Cu-containing alloy and on those of Ge-containing alloys are different, i.e., with increasing Co content, both D and Hc of Cu-containin...
Source: Physics Letters A - November 9, 2019 Category: Physics Source Type: research

In situ-monitored enhancement and quenching effect of Cu nanoclusters on Sm3+ photoluminescence in glass
Publication date: Available online 7 November 2019Source: Physics Letters AAuthor(s): José A. JiménezAbstractAn assessment of the influence of heat treatment temperature and retention time on the optical properties of a Cu+ and Sm3+ co-doped phosphate glass of interest to photonic applications is reported. Particularly, the enhancement of the orange-red photoluminescence (PL) from Sm3+ ions has been realized in the glass through the development of non-plasmonic Cu clusters. It was exposed during an in situ isothermal treatment wherein optical absorption and PL were monitored together in real time. Following t...
Source: Physics Letters A - November 9, 2019 Category: Physics Source Type: research

Phonon focusing effect on thermal conductivity of hexagonal group III-nitrides and silicon carbide crystals
Publication date: Available online 7 November 2019Source: Physics Letters AAuthor(s): D.A. Chernodoubov, A.V. InyushkinAbstractThermal conductivity κ of 4H-, 6H-SiC and wurtzite GaN, InN, AlN crystals is calculated accounting phonon focusing effect at low temperatures with only diffusive phonon boundary scattering. The orientation dependence of thermal conductivity is similar in these materials. Thermal conductivity is enhanced in the direction of approximately 45∘ to the c axis up to 27% for GaN, 24% for 6H-SiC, 32% for InN, and 9% for AlN compared to the isotropic case for the circular cross-section and finite-le...
Source: Physics Letters A - November 9, 2019 Category: Physics Source Type: research

Strong Jahn-Teller effect at NiO4 tetrahedron in NiCo2O4 spinel
Publication date: Available online 6 November 2019Source: Physics Letters AAuthor(s): Dixing Ni, Shude Liu, Musheng Wu, Xueling Lei, Bo Xu, Seong-Chan Jun, Chuying OuyangAbstractThe local structural distortion and electronic structure of the NiCo2O4 spinel are studied from first-principles calculations. It is found that very strong Jahn-Teller (J-T) distortion occurs to the NiO4 tetrahedron and a large energy gain is obtained, leading to a substantial elongation of the lattice and a cubic to tetragonal phase transition. Further analysis shows that the Ni-3d states are split by not only the broken Td symmetry of the NiO4, c...
Source: Physics Letters A - November 8, 2019 Category: Physics Source Type: research

Interfacial magnetic coupling and the confinement effect of spin electrons for τ-MnAl/Ni multilayers
Publication date: Available online 6 November 2019Source: Physics Letters AAuthor(s): Xianmin Zhang, Junwei Tong, Linrui Li, Liuxia Ruan, Fubo Tian, Gaowu QinAbstractThe interface energy and magnetic coupling of τ-MnAl/Ni were studied by first-principles calculations. It was found that τ-MnAl/Ni with Al terminal would be more steady. The magnetic coupling between τ-MnAl film and Ni films oscillated with increasing the thickness of Ni layer. Moreover, the couplings of τ-MnAl/Ni were ferromagnetic and antiferromagnetic when the number of Ni layers were even and odd, respectively. Based on the Fermi surface an...
Source: Physics Letters A - November 6, 2019 Category: Physics Source Type: research

Effects of hydroxyl groups and hydrogen passivation on the structure, electrical and optical properties of silicon carbide nanowires
Publication date: Available online 4 November 2019Source: Physics Letters AAuthor(s): Ya-Hui Jia, Pei Gong, Shu-Long Li, Wan-Duo Ma, Xiao-Yong Fang, Ying-Ying Yang, Mao-Sheng CaoAbstractThe effects of hydrogen and hydroxyl passivation on the structure, electrical and optical properties of SiCNWs were investigated. The passivation performance of different atoms (groups) were discussed by analyzing the distribution of electronic states and the polarity of chemical bonds. The results show that passivation can improve the stability of SiCNWs structure, and the effect of hydroxyl is better than hydrogen passivation. And hydroge...
Source: Physics Letters A - November 6, 2019 Category: Physics Source Type: research

Editors
Publication date: 9 January 2020Source: Physics Letters A, Volume 384, Issue 1Author(s): (Source: Physics Letters A)
Source: Physics Letters A - November 6, 2019 Category: Physics Source Type: research

Dissipative optical solitons in asymmetric Rosen-Morse potential
In this study, stability of solution is examined by numerical analysis to show that solitons are stable for some parameter ranges for both self-focusing and self-defocusing nonlinear modes. Dynamical properties such as evolution and transverse energy flow for both modes are also analyzed. Obtained results are useful for experimental designs and applications in related fields. (Source: Physics Letters A)
Source: Physics Letters A - November 1, 2019 Category: Physics Source Type: research

Symmetry-breaking vortex-lattice of a binary superfluid in a rotating bucket
Publication date: Available online 31 October 2019Source: Physics Letters AAuthor(s): S.K. AdhikariAbstractWe study spontaneous-symmetry-broken phase-separated vortex lattice in a weakly interacting uniform rapidly rotating binary Bose superfluid contained in a quasi-two-dimensional circular or square bucket. For the inter-species repulsion above a critical value, the two superfluid components separate and form a demixed phase with practically no overlap in the vortex lattices of the two components, which will permit an efficient experimental observation of such vortices and study their properties. In case of a circular bu...
Source: Physics Letters A - November 1, 2019 Category: Physics Source Type: research

Hamiltonian nature of monopole dynamics
Publication date: Available online 31 October 2019Source: Physics Letters AAuthor(s): J.M. Heninger, P.J. MorrisonAbstractClassical electromagnetism with magnetic monopoles is not a Hamiltonian field theory because the Jacobi identity for the Poisson bracket fails. The Jacobi identity is recovered only if all of the species have the same ratio of electric to magnetic charge or if an electron and a monopole can never collide. Without the Jacobi identity, there are no local canonical coordinates or Lagrangian action principle. To build a quantum field of magnetic monopoles, we either must explain why the positions of electro...
Source: Physics Letters A - November 1, 2019 Category: Physics Source Type: research

Earthquake forecast based on its nucleation stages and the ensuing electromagnetic radiations
Publication date: Available online 31 October 2019Source: Physics Letters AAuthor(s): V. Frid, A. Rabinovitch, D. BahatAbstractA schematic spatial model of an earthquake nucleation is analyzed, and the three stages of the process are identified. Accordingly, the electromagnetic radiations emitted by the fracturing phenomena accompanying each stage are analyzed and it is demonstrated, that the changes of parameters in the persistent specific shape of these radiations during the stages are significant. Specifically, we analyze radiation changes in frequency, directionality and amplitude together with their relations to the f...
Source: Physics Letters A - November 1, 2019 Category: Physics Source Type: research

A three-dimensional frequency selective structure based on the modes coupling of spoof surface plasmon and waveguide transmission
Publication date: Available online 31 October 2019Source: Physics Letters AAuthor(s): Wei Jiang, Ya Fan, Hua Ma, Jiafu Wang, Leilei Yan, Peng Han, Shaobo QuAbstractA three-dimensional frequency selective structure (3D FSS) was proposed by applying the spoof surface plasmon (SSP) structures into periodic waveguides, which realizes an enhanced broadband transmission in low frequencies, below the cut-off frequency of periodic waveguides. The transmission characteristics of SSP structures and periodic waveguides as well as their coupling modes are investigated by simulation and experiment method. According to our analysis, the...
Source: Physics Letters A - November 1, 2019 Category: Physics Source Type: research

Theory of aerodynamic heating from molecular collision analysis
Publication date: Available online 30 October 2019Source: Physics Letters AAuthor(s): Yi Tao, Zhongwu Li, Quan Han, Chengdong Sun, Yan Zhang, Yunfei ChenAbstractAn aerodynamic heating model is derived from molecular collision analysis, in which the rising temperature of a hypersonic flying object as a function of the flying speed in a classical dense monoatomic gas environment is set up. The model predicts that the rising temperature of the hypersonic flying object is independent of the gas density but depends linearly on the gas atomic mass. A nonequilibrium molecular dynamics simulation is carried out to verify the theor...
Source: Physics Letters A - October 31, 2019 Category: Physics Source Type: research

A novel excitation scheme to enhance image resolution in dynamic atomic force microscopy
Publication date: Available online 30 October 2019Source: Physics Letters AAuthor(s): Mohammad Safikhani Mahmoudi, Arash BahramiAbstractWe propose a novel multifrequency excitation technique for the non-contact atomic force microscopy (AFM). The probe is excited at two frequencies that are far from resonances while their subtraction is close to the fundamental frequency. Due to combination resonance occurring in nonlinear systems, the response includes a term with frequency equal to subtraction of excitation frequencies. We suggest to employ this term as the main signal for imaging. It is found that the present excitation ...
Source: Physics Letters A - October 31, 2019 Category: Physics Source Type: research

Physical properties of ZnSe thin films: Air and vacuum annealing evolution to buffer layer applications
Publication date: Available online 30 October 2019Source: Physics Letters AAuthor(s): Ritika Sharma, Himanshu, S.L. Patel, S. Chander, M.D. Kannan, M.S. DhakaAbstractIn order to develop high efficiency solar cell device by replacing conventional hazardous CdS window layer by environmental friendly Zn-based buffer layer, ZnSe thin films of thickness 100 nm were grown on glass and ITO substrates employing electron beam evaporation technique followed by air and vacuum annealing at temperature 100 °C, 200 °C and 300 °C. As-grown and annealed films were subjected to characterization tools like XRD, UV...
Source: Physics Letters A - October 31, 2019 Category: Physics Source Type: research

Interaction of phonons with discrete breathers in one-dimensional chain with tunable type of anharmonicity
Publication date: Available online 30 October 2019Source: Physics Letters AAuthor(s): F. Hadipour, D. Saadatmand, M. Ashhadi, A. Moradi Marjaneh, I. Evazzade, A. Askari, S.V. DmitrievAbstractIn this paper, we consider the interaction of small amplitude waves (phonons) with standing discrete breather (DB) in the one-dimensional chain of harmonically coupled particles interacting with the anharmonic one-site potential, which can be of hard-type or soft-type anharmonicity. The coefficients of phonon reflection and transmission are calculated numerically. It is found that for the case of hard-type anharmonicity (soft-type anha...
Source: Physics Letters A - October 31, 2019 Category: Physics Source Type: research

First-principles effective Hamiltonian calculations of the electrocaloric effect in ferroelectric BaxSr1−xTiO3
Publication date: Available online 28 October 2019Source: Physics Letters AAuthor(s): M. Tarnaoui, M. Zaim, M. Kerouad, A. ZaimAbstractFerroelectric materials possess largest thermal response upon variations of the applied electric field, however, the magnitude corresponding to electrocaloric effect (ECE) is relatively too small for cooling applications. Theoretical insight is therefore required to provide additional information, leading to better understanding of the electrocaloric effect with enhanced performance. In this work, electrocaloric effect in BaxSr1−xTiO3 (BST) ferroelectric ceramics is calculated from fi...
Source: Physics Letters A - October 29, 2019 Category: Physics Source Type: research

Spin-orbit interactions in semiconductor superlattice
Publication date: Available online 28 October 2019Source: Physics Letters AAuthor(s): Ya-Fei HaoAbstractThe purpose of this paper is to theoretically investigate the spin-orbit interactions of common semiconductor superlattices. Spin splitting and spin-orbit interaction coefficients are calculated based on interactions between the interface-related-Rashba effect and Dresselhaus effect. Semiconductor superlattice shows a series of specific characteristics in spin splitting as follows. The spin splitting of the superlattice structure is greater than that of a single quantum well, contributing to significant spin polarization...
Source: Physics Letters A - October 29, 2019 Category: Physics Source Type: research

Second harmonic Hamiltonian: Algebraic and Schrödinger approaches
Publication date: Available online 28 October 2019Source: Physics Letters AAuthor(s): T. Mohamadian, H. Panahi, J. NegroAbstractWe study in detail the behavior of the energy spectrum for the second harmonic generation (SHG) and a family of corresponding quasi-exactly solvable Schrödinger potentials labeled by a real parameter b. The eigenvalues of this system are obtained by the polynomial deformation of the Lie algebra sl(2,R) representation space. We have found the bi-confluent Heun equation (BHE) corresponding to this system in a differential realization approach, by making use of the symmetries. By means of a b-tr...
Source: Physics Letters A - October 29, 2019 Category: Physics Source Type: research

One-loop effective potential for two-dimensional competing scalar order parameters
Publication date: Available online 28 October 2019Source: Physics Letters AAuthor(s): Nei Lopes, Mucio A. Continentino, Daniel G. BarciAbstractUsing the method of the effective potential of quantum field theory, we compute the quantum corrections to the phase diagram of systems with competing order parameters. This is specially useful to study metallic systems with competing antiferromagnetic and superconducting ground states. We focus on the two-dimensional case that is relevant for high Tc superconductors and heavy fermion systems. We consider two different types of couplings between the order parameters and obtain the m...
Source: Physics Letters A - October 29, 2019 Category: Physics Source Type: research

Non-Hermitian anomalous skin effect
Publication date: Available online 28 October 2019Source: Physics Letters AAuthor(s): C. YuceAbstractA non-Hermitian topological insulator is fundamentally different from conventional topological insulators. The non-Hermitian skin effect arises in a nonreciprocal tight binding lattice with open edges. In this case, not only topological states but also bulk states are localized around the edges of the nonreciprocal system. We discuss that controllable switching from topological edge states into topological extended states in a chiral symmetric non-Hermitian system is possible. We show that the skin depth decreases with non-...
Source: Physics Letters A - October 29, 2019 Category: Physics Source Type: research

Approximation of quantum assemblages
Publication date: Available online 25 October 2019Source: Physics Letters AAuthor(s): Xiaojing Yan, Zhi Yin, Longsuo LiAbstractIn this paper, we derive a set of projectors on a large Hilbert space which can universally work for approximating quantum assemblages with binary inputs and outputs. The dimension of the Hilbert space depends on the accuracy of the approximation. (Source: Physics Letters A)
Source: Physics Letters A - October 27, 2019 Category: Physics Source Type: research

Dynamics of emotional contagion in dense pedestrian crowds
Publication date: Available online 25 October 2019Source: Physics Letters AAuthor(s): Tengfei Xu, Dongdong Shi, Juan Chen, Tao Li, Peng Lin, Jian MaAbstractIn places with high-density pedestrian movements, irrational emotions can quickly spread out under emergency, which may eventually lead to asphyxiation and crushing. It was noticed that a pedestrian's emotion in crowd would change as a result of the influence from other pedestrians. Thus, to explore the dynamics of emotion contagion process in flowing dense pedestrians, two types of pedestrian emotions, i.e., negative and positive have been identified. Taking into accou...
Source: Physics Letters A - October 27, 2019 Category: Physics Source Type: research

Temporal and spatial resolutions of optical time stretch imaging with dispersive grating pair
Publication date: Available online 24 October 2019Source: Physics Letters AAuthor(s): Lei Yang, Qian Zhu, Chao Wang, Hui Chen, Jincheng Li, Hongbo XieAbstractOptical time stretch imaging (OTSI), providing the capability of capturing the dynamics of fast single-shot or random events, overcomes the fundamental trade-off between imaging speed and sensitivity in ultrafast imaging regions. Lying at the heart of the OTSI is dispersive Fourier transformation, being capable of using large chromatic dispersion to map the spectrum of a broadband ultrashort optical pulse into a stretched time-domain waveform. Dispersive grating pair ...
Source: Physics Letters A - October 25, 2019 Category: Physics Source Type: research

Performance improvement of unidimensional continuous-variable quantum key distribution using heralded hybrid linear amplifier
Publication date: Available online 24 October 2019Source: Physics Letters AAuthor(s): Kunlin Zhou, Zhiya Chen, Ying Guo, Qin LiaoAbstractWe propose an improved scheme for unidimensional continuous-variable quantum key distribution (UCVQKD) using heralded hybrid linear amplifier, aiming to simplify the implementation and improve secret key rate. Different from the symmetrical continuous-variable quantum key distribution protocol (CVQKD), this scheme modulates one quadrature of the coherent state with security insurance. The heralded hybrid linear amplifier concatenates a deterministic linear amplifier (DLA) and a noiseless ...
Source: Physics Letters A - October 25, 2019 Category: Physics Source Type: research

Nonlinear integrable systems containing the canonical subsystems of distinct physical origins
Publication date: Available online 24 October 2019Source: Physics Letters AAuthor(s): Oleksiy O. VakhnenkoAbstractFour new semi-discrete nonlinear integrable systems relevant for physical applications are suggested. Each system contains two coupled subsystems of distinct physical origin. These integrable hybridizations are (1) the Toda-like subsystem coupled with the induced-trapping subsystem of PT-symmetric excitations, (2) the subsystem of Frenkel-like excitons coupled with the subsystem of nontrivial vibrations, (3) two coupled self-trapping subsystems, (4) the Toda-like subsystem coupled with the self-trapping subsyst...
Source: Physics Letters A - October 25, 2019 Category: Physics Source Type: research

Editors
Publication date: 27 December 2019Source: Physics Letters A, Volume 383, Issue 36Author(s): (Source: Physics Letters A)
Source: Physics Letters A - October 25, 2019 Category: Physics Source Type: research

A novel metallic silicon hexaboride, Cmca-B6Si
This study gives a fundamental investigation on the structural, phonon, and electronic properties of Cmca-B6Si. (Source: Physics Letters A)
Source: Physics Letters A - October 25, 2019 Category: Physics Source Type: research

Light emission properties in a double quantum dot molecule immersed in a cavity: Phonon-assisted tunneling
Publication date: Available online 23 October 2019Source: Physics Letters AAuthor(s): Vladimir Vargas-Calderón, Herbert Vinck-PosadaAbstractTwo main mechanisms dictate the tunneling process in a double quantum dot: overlap of excited wave functions, effectively described as a tunneling rate, and phonon-assisted tunneling. In this paper, we study different regimes of tunneling that arise from the competition between these two mechanisms in a double quantum dot molecule immersed in a unimodal optical cavity. We show how such regimes affect the mean number of excitations in each quantum dot and in the cavity, the spect...
Source: Physics Letters A - October 25, 2019 Category: Physics Source Type: research

Strong chaos of fast scrambling yields order: Emergence of decoupled quantum information capsules
Publication date: Available online 23 October 2019Source: Physics Letters AAuthor(s): Masahiro Hotta, Koji YamaguchiAbstractThe information loss problem in black hole evaporation is one of fundamental issues. Its resolution requires more profound understanding of information storage mechanism in quantum systems. In this Letter, we argue that when multiple unknown parameters are stored in large entangled qudits, strong chaos generated by fast scrambling in high temperature limit yields an ordered information storage structure with decoupled quantum information capsules (QICs). A rotational isometry emerges in the quantum Fi...
Source: Physics Letters A - October 25, 2019 Category: Physics Source Type: research

Investigation on thermal conductivity of graphene/Si heterostructure with different defect ratios and sizes
Publication date: Available online 23 October 2019Source: Physics Letters AAuthor(s): Dongjing LiuAbstractThe thermal conductivity (TC) of graphene/Si heterostructures with different defect ratios and sizes was investigated using the molecular dynamics method. As the defect ratio of heterostructure increased, the TC decreased first sharply and then slowly under a high temperature stage. The TC of heterostructure also showed a significant size effect. This phenomenon was explained by phonon dispersion and flip competition. The phonon density of states for the graphene heterostructure with different defect ratios and sizes w...
Source: Physics Letters A - October 25, 2019 Category: Physics Source Type: research

Au-MoOx nanoparticles for LSPR hydrogen detection prepared by a facile anodizing method
Publication date: Available online 23 October 2019Source: Physics Letters AAuthor(s): M.A. Hosseini, M. Ranjbar, M. SajadiAbstractNowadays, the plasmonic properties of defective transition metal oxides, have attracted great attention in the sensing and catalyst applications. The aim of this paper is to fabricate plasmonic Au-MoOx nanoparticles (NPs) using a facile anodizing in liquid approach to be used as localized surface plasmon resonance (LSPR) hydrogen sensor. Firstly, dark blue MoOx nanosheets with a strong NIR (700–800 nm) LSPR band were obtained. The Au-MoOx NPs (Au size=5–7 nm) were then obtained by ad...
Source: Physics Letters A - October 25, 2019 Category: Physics Source Type: research