Analysis on lump, lumpoff and rogue waves with predictability to the (2 + 1)-dimensional B-type Kadomtsev–Petviashvili equation
Publication date: Available online 7 August 2018Source: Physics Letters AAuthor(s): Wei-Qi Peng, Shou-Fu Tian, Tian-Tian ZhangAbstractIn this work, we investigate the (2+1)-dimensional B-type Kadomtsev–Petviashvili (BKP) equation, which can be used to describe weakly dispersive waves propagating in the quasi media and fluid mechanics. We construct the more general lump solutions, localized in all directions in space, with more arbitrary autocephalous parameters. By considering a stripe soliton generated completely by lump solution, a lumpoff solution is presented. Its lump part is cut by soliton part before or after ...
Source: Physics Letters A - August 8, 2018 Category: Physics Source Type: research

Acceleration of Adiabatic Quantum State Transfer in a spin chain under zero-energy-change pulse control
We present a protocol for accelerating adiabatic quantum state transfer through a spin chain by adding an effective control pulse. Using Feshbach P-Q partitioning technique, we obtain the one-component dynamical equation which guides us to set the amplitude and period of the control field. This field can be a sequence of alternatively negative and positive (zero-energy change) pulses which can be realized easily in experiment. As an example, we discuss a three particles spin chain and the numerical calculation shows that the accelerated quantum state transfer can be obtained. (Source: Physics Letters A)
Source: Physics Letters A - August 8, 2018 Category: Physics Source Type: research

Editors
Publication date: 22 September 2018Source: Physics Letters A, Volume 382, Issue 37Author(s): (Source: Physics Letters A)
Source: Physics Letters A - August 7, 2018 Category: Physics Source Type: research

Effects of electron–electron interaction on the collinear indirect exchange coupling in graphene nanoflakes
Publication date: Available online 3 August 2018Source: Physics Letters AAuthor(s): Akram Mirehi, Ebrahim Heidari-SemiromiAbstractUsing the Hubbard model in the framework of the tight-bonding formulation, we studied the effects of the electron–electron (e–e) interaction on the indirect magnetic exchange coupling between the magnetic impurities embedded in triangular graphene nanoflakes. The results show that the magnitude of the coupling enhances in the presence of the e–e interaction and Rashba spin–orbit interaction (RSOI). The RKKY coupling magnitude depends on the impurity positions in nanoflake...
Source: Physics Letters A - August 4, 2018 Category: Physics Source Type: research

A macro traffic flow model with probability distribution function
Publication date: Available online 3 August 2018Source: Physics Letters AAuthor(s): Hui Ou, Tie-Qiao Tang, Jian Zhang, Jie-Ming ZhouAbstractIn this paper, we introduce three probability distribution functions into the dynamic equation and propose a macro traffic flow model to investigate the impacts of the probability distribution functions on the evolutions of traffic flow under three typical states (i.e., uniform flow, shock, rarefaction wave, and small perturbation). The numerical results indicate that the probability distribution functions do not change the density and speed distributions of uniform flow, produce a two...
Source: Physics Letters A - August 4, 2018 Category: Physics Source Type: research

Indirect strong coupling regime between a quantum emitter and a cavity mediated by a mechanical resonator
Publication date: Available online 3 August 2018Source: Physics Letters AAuthor(s): J.E. Ramírez-Muñoz, J.P. Restrepo Cuartas, H. Vinck-PosadaAbstractAchieving strong coupling between light and matter is usually a challenge in Cavity Quantum Electrodynamics (cQED), especially in solid state systems. For this reason is useful taking advantage of alternative approaches to reach this regime, and then, generate reliable quantum polaritons. In this work we study a system composed of a quantized single mode of a mechanical resonator interacting linearly with both a single mode cavity and a quantum two-level system....
Source: Physics Letters A - August 4, 2018 Category: Physics Source Type: research

Role of memory effect in the evolution of cooperation based on spatial prisoner's dilemma game
Publication date: Available online 3 August 2018Source: Physics Letters AAuthor(s): Wenwen Lu, Juan Wang, Chengyi XiaAbstractWe investigate the impact of memory effect on the evolution of cooperation in the spatial prisoner's dilemma game, in which each player will record his own strategies during the previous M game rounds (here, M is also named as the memory length). At each time step, each individual will update his current strategy according to the Fermi-like probability which will be multiplied by a pre-factor, and this factor will be correlated with the fraction of previous strategy states identical with the individu...
Source: Physics Letters A - August 4, 2018 Category: Physics Source Type: research

Investigations of half-metallic ferromagnetism and thermoelectric properties of cubic XCrO3 (X = Ca,Sr,Ba) compounds via first-principles approaches
Publication date: Available online 2 August 2018Source: Physics Letters AAuthor(s): N.A. Noor, M. Bilal Saddique, Bakhtiar Ul Haq, A. Laref, Muhammad RashidAbstractIn this paper, the physical aspects of the cubic phase XCrO3 (X=Ca,Sr,Ba) perovskites are studied by employing full-potential linearized augmented plane wave plus local orbital (FP-LAPW+lo) method. These compounds have been found stable in ferromagnetic (FM) phase since they possess lower energy in FM phase compared to non-FM phase and their stability is also confirmed by calculating the enthalpy of formation (ΔH). The electronic structures of these compou...
Source: Physics Letters A - August 3, 2018 Category: Physics Source Type: research

Vortex state in thermally-induced pinning patterns in superconducting film
Publication date: Available online 2 August 2018Source: Physics Letters AAuthor(s): J.D. González, M.R. Joya, J. Barba-OrtegaAbstractWe propose a way to manipulate the landscape of the superconducting condensate in thin films via stripe-like (1D) and checkerboard (2D) periodic patterns. Our approach is based on the spatially localized heating of the superconductor, which is reflected in sinusoidal variations of the local temperature, which can be produced via, e.g., a focused laser beam or nanoheaters. This simple approach provides a very good alternative for modulation of the vortex collective, emerging in the type...
Source: Physics Letters A - August 2, 2018 Category: Physics Source Type: research

Investigations of half-metallic ferromagnetism and thermoelectric properties of cubic XCrO3 (X=Ca, Sr, Ba) compounds via first-principles approaches
Publication date: Available online 2 August 2018Source: Physics Letters AAuthor(s): N.A. Noor, M. Bilal Saddique, Bakhtiar Ul Haq, A. Laref, Muhammad RashidAbstractIn this paper, the physical aspects of the cubic phase XCrO3 (X=Ca, Sr, Ba) perovskites are studied by employing full-potential linearized augmented plane wave plus local orbital (FP-LAPW+lo) method. These compounds have been found stable in ferromagnetic (FM) phase since they possess lower energy in FM phase compared to non FM phase and their stability is also confirmed by calculating the enthalpy of formation (ΔH). The electronic structures of these comp...
Source: Physics Letters A - August 2, 2018 Category: Physics Source Type: research

Study on the electronic structures and transport properties of the polyporphyrin nanoribbons with different edge configurations
Publication date: Available online 2 August 2018Source: Physics Letters AAuthor(s): Shidong Zhang, Xiaojiao Zhang, Mingjun Li, Bowen Zeng, Haiming Duan, Dan Zhang, Mengqiu LongAbstractCombining the density functional theory with the non-equilibrium Green's function, three kinds of polyporphyrin nanoribbons (PPNRs) with different edge configurations have been considered: 1) all carbocyclic eight-membered rings (C8-Rs) located in edge are broken (M1); 2) all C8-Rs located in edge are perfect (M2); 3) partial C8-Rs located in edge are broken, subject to two kinds of configurations, as illustrated by M3 and M4. Calculation res...
Source: Physics Letters A - August 2, 2018 Category: Physics Source Type: research

Orbital Angular Momentum of Channeling Radiation from Relativistic Electrons in Thin Si Crystal
Publication date: Available online 1 August 2018Source: Physics Letters AAuthor(s): S.V. Abdrashitov, O.V. Bogdanov, P.O. Kazinski, T.A. TukhfatullinAbstractWe propose to use channeling radiation (CR) from relativistic electrons as a source of high energy twisted photons in the MeV range. We calculate numerically the orbital angular momentum (OAM) of radiation produced by electrons with the energies 155÷2500 MeV for the axial and planar channeling in the thin Si crystal. We obtain that the average OAM of CR in this case is approximately 1÷6ħ per photon with the photon energies about 1÷2 MeV. (Source: Physics Letters A)
Source: Physics Letters A - August 2, 2018 Category: Physics Source Type: research

Quantum switch for coupling highly detuned superconducting qubits
Publication date: Available online 1 August 2018Source: Physics Letters AAuthor(s): Ji-kun Xie, Sheng-li Ma, Zhi-peng Yang, Zhen Li, Fu-li LiAbstractWe propose to implement a quantum switch scheme for coupling highly detuned superconducting qubits connected by a gap-tunable bridge qubit. By modulating the frequency of the bridge qubit, it can be used as a coupler to switch on/off and adjust the coupling strength between the initially non-interaction qubits. It is shown that the proposals of quantum information transfer and quantum entangled gate between two highly detuned qubits can be implemented with high fidelity. Moreo...
Source: Physics Letters A - August 2, 2018 Category: Physics Source Type: research

Mapping quantum many-body system to decoupled harmonic oscillators: General discussions and examples
We present a class of quantum systems that can be mapped to decoupled harmonic oscillators through appropriate similarity transformations. We will take advantage of these similarity transformations to discover hidden ladder operators, such that the eigenstates of the system can be constructed like those of harmonic oscillator. We also provide five systems belonging to this family as examples. (Source: Physics Letters A)
Source: Physics Letters A - August 1, 2018 Category: Physics Source Type: research

A predictive framework for quantum gravity and black hole to white hole transition
Publication date: Available online 1 August 2018Source: Physics Letters AAuthor(s): Robert OecklAbstractThe apparent incompatibility between quantum theory and general relativity has long hampered efforts to find a quantum theory of gravity. The recently proposed positive formalism for quantum theory purports to remove this incompatibility. We showcase the power of the positive formalism by applying it to the black hole to white hole transition scenario that has been proposed as a possible effect of quantum gravity. We show how the characteristic observable of this scenario, the bounce time, can be predicted within the pos...
Source: Physics Letters A - August 1, 2018 Category: Physics Source Type: research

Electro-optic tunable band-stop filters using piezoelectric superlattices
Publication date: Available online 31 July 2018Source: Physics Letters AAuthor(s): Zheng-Hua Tang, Zheng-Sheng Jiang, Tao Chen, Da-Jun Lei, Jian-Quan Huang, Feng Qiu, Chun-Zhi Jiang, Min Yao, Xiao-Yi HuangAbstractA novel band-stop filter, which uses the piezoelectric superlattices with the external direct-current (DC) electric fields, is presented. The forbidden band of the band-stop filter can be generated by the coupling between lattice vibration and electromagnetic waves and can be tuned continuously and reversibly by the DC electric field via the electro-optic effect. The band structures and transmission spectra of the...
Source: Physics Letters A - August 1, 2018 Category: Physics Source Type: research

Superregular breathers and state transitions in a resonant erbium-doped fiber system with higher-order effects
We present the superregular breather solutions that are nonlinear superposition of a pair of travelling breathers propagating in opposite directions. We further study the full- and half-transition modes of the superregular breather solution, which appears as a result of the coupled and higher-order effects. These waves reduce to small localized perturbations of the background at time zero. (Source: Physics Letters A)
Source: Physics Letters A - July 31, 2018 Category: Physics Source Type: research

Editors
Publication date: 14 September 2018Source: Physics Letters A, Volume 382, Issue 36Author(s): (Source: Physics Letters A)
Source: Physics Letters A - July 31, 2018 Category: Physics Source Type: research

Electronic Bloch oscillation in a pristine monolayer graphene
Publication date: Available online 29 July 2018Source: Physics Letters AAuthor(s): Tongyun Huang, Ruofan Chen, Tianxing Ma, Li-Gang Wang, Hai-Qing LinAbstractIn a pristine monolayer graphene subjected to a constant electric field along the layer, the Bloch oscillation of an electron is studied in a simple and efficient way. By using the electronic dispersion relation, the formula of a semi-classical velocity is derived analytically, and then many aspects of Bloch oscillation, such as its frequency, amplitude, as well as the direction of the oscillation, are investigated. It is interesting to find that the electric field af...
Source: Physics Letters A - July 29, 2018 Category: Physics Source Type: research

Spin-gapped phases in the frustrated Hubbard chain with transverse spin anisotropy
Publication date: Available online 27 July 2018Source: Physics Letters AAuthor(s): Hanqin Ding, Na Zhao, Xueling Shi, Jun Zhang, Yongdong HeAbstractAt weak coupling, we investigate the frustrated Hubbard chain including nearest-neighbor and next-nearest-neighbor antiferromagnetic exchange with easy-plane anisotropy J1xy and J2xy. At half filling, we obtain three different phases in the J1xy–J2xy plane: a transverse spin density wave phase, a bond order wave phase and a Luther–Emery metallic phase characterized by the coexistence of singlet superconductivity and charge density wave correlations. The frustrating ...
Source: Physics Letters A - July 28, 2018 Category: Physics Source Type: research

Multiple phase transitions in the XY model with nematic-like couplings
Publication date: Available online 27 July 2018Source: Physics Letters AAuthor(s): Milan ŽukovičAbstractCritical behavior of the two-dimensional generalized XY model involving solely nematic-like terms of the second, third and fourth orders is studied by Monte Carlo method. We find that such a system can undergo three successive phase transitions. At higher temperatures there is a phase transition of the Berezinskii–Kosterlitz–Thouless type to the q=4 nematic-like phase, followed by two more transitions of the Ising type to the q=2 nematic-like and ferromagnetic phases, respectively. The q nematic-like phases...
Source: Physics Letters A - July 28, 2018 Category: Physics Source Type: research

Electronic heat capacity in disordered graphene systems
Publication date: Available online 27 July 2018Source: Physics Letters AAuthor(s): I. Grosu, T.-L. BiterAbstractWe analyzed the electronic heat capacity of graphene systems in the presence of disorder. We consider the case of strong scatterers, working in the unitary limit. The temperature dependence of the electronic heat capacity is analyzed. Close to the clean limit we obtained the quadratic temperature dependence, corrected with a temperature and disorder dependent factor which slightly enhance the heat capacity. At very low temperatures, and in the presence of disorder, we obtained a linear temperature dependence of t...
Source: Physics Letters A - July 28, 2018 Category: Physics Source Type: research

Erratum to “High energy radiation precursors to the collapse of black holes binaries based on resonating plasma modes” [Phys. Lett. A 382 (2018) 1283–1286]
Publication date: Available online 26 July 2018Source: Physics Letters AAuthor(s): Bruno Coppi (Source: Physics Letters A)
Source: Physics Letters A - July 26, 2018 Category: Physics Source Type: research

Finite time thermodynamic analysis of quantum Otto heat engine with squeezed thermal bath
Publication date: Available online 25 July 2018Source: Physics Letters AAuthor(s): Bo Xiao, Renfu LiAbstractWe investigate the finite time performance of reciprocating quantum Otto heat engine coupled to squeezed hot reservoir. We emphasize the converged limit cycle where each stroke is performed in finite time. To fully exploit the quantum availability provided by the squeezed bath, an optimal frequency protocol in the work extraction stroke is explicitly proposed. The power output is optimized with respect to the hot and cold isochore times. Thermodynamic analysis shows that for a wide range of squeezing parameters, effi...
Source: Physics Letters A - July 26, 2018 Category: Physics Source Type: research

Quantum speed limit for qubit systems: Exact results
Publication date: Available online 24 July 2018Source: Physics Letters AAuthor(s): Lin Zhang, Yuan Sun, Shunlong LuoAbstractGiven an initial state, a target state, and a driving Hamiltonian, how fast can the initial state evolve into the target state according to the Schröchinger dynamics? This problem arises in a variety of contexts such as quantum computation, quantum control, and in particular, the problem of maximum information processing rate of quantum systems, and has been studied extensively due to its fundamental importance. In this paper, we purse further the study in the qubit case in which the particular s...
Source: Physics Letters A - July 25, 2018 Category: Physics Source Type: research

Bohmian formalism and Fisher information from q-deformed Schrödinger equation
Publication date: Available online 24 July 2018Source: Physics Letters AAuthor(s): Bruno G. da Costa, Ignacio S. GomezAbstractWe discuss the Bohmian mechanics by means of a deformed Schrödinger equation for position-dependent mass systems, in the context of a q-algebra inspired by the nonextensive statistical mechanics. We obtain the Bohmian quantum formalism by means of a deformed version of the Fisher information functional, from which a deformed Cramér-Rao bound is derived. Lagrangian and Hamiltonian formulations, inherited by the q-algebra, are also developed. Then, we illustrate the results with a particle...
Source: Physics Letters A - July 25, 2018 Category: Physics Source Type: research

General initial value problem for the nonlinear shallow water equations: Runup of long waves on sloping beaches and bays
Publication date: Available online 23 July 2018Source: Physics Letters AAuthor(s): Dmitry Nicolsky, Efim Pelinovsky, Amir Raz, Alexei RybkinAbstractWe formulate a new approach to solving the initial value problem of the shallow water-wave equations utilizing the famous Carrier–Greenspan transformation (Carrier and Greenspan (1957) [9]). We use a Taylor series approximation to deal with the difficulty associated with the initial conditions given on a curve in the transformed space. This extends earlier solutions to waves with near shore initial conditions, large initial velocities, and in more complex U-shaped bathyme...
Source: Physics Letters A - July 24, 2018 Category: Physics Source Type: research

Optimized Peltier cooling via an array of quantum dots with stair-like ground-state energy configuration
Publication date: Available online 23 July 2018Source: Physics Letters AAuthor(s): Aniket SinghaAbstractWith the advancement in fabrication and scaling technology, the rising temperature in nano devices has attracted special attention towards thermoelectric or Peltier cooling. In this paper, I propose optimum Peltier cooling by employing an array of connected quantum dots with stair-like ground-state eigen energy configuration. The difference in ground state eigen energy between two adjacent quantum dots in the stair-like configuration is chosen to be identical with the optical phonon energy for efficient absorption of lat...
Source: Physics Letters A - July 24, 2018 Category: Physics Source Type: research

Editors
Publication date: 7 September 2018Source: Physics Letters A, Volume 382, Issue 35Author(s): (Source: Physics Letters A)
Source: Physics Letters A - July 21, 2018 Category: Physics Source Type: research

Multiple spin-resolved negative differential resistance and electrically controlled spin-polarization in transition metal-doped [6]cycloparaphenylenes
Publication date: Available online 19 July 2018Source: Physics Letters AAuthor(s): Yan-Dong Guo, Hong-Li Zeng, Li-Zhi Hu, Xiao-Hong Yan, Xin-Yi Mou, Mou-Shu YangAbstractIn structure, a [n]cycloparaphenylene ([n]CPP) molecule is constructed by fully conjugated bent benzenes, i.e., hexangular rings. Based on first-principles calculations, the spin-dependent electronic transport of transition metal-doped CPP, X@[6]cycloparaphenylene (X@[6]CPP) (XFe, Co and Ni), contacted with Au electrodes is investigated. (Multiple) negative differential resistance (NDR) is observed for all the doping cases, suggesting it is the intrinsic fe...
Source: Physics Letters A - July 20, 2018 Category: Physics Source Type: research

Universal absorption of two-dimensional materials within k ⋅ p method
Publication date: Available online 18 July 2018Source: Physics Letters AAuthor(s): Rong Huang, Jun Li, Zhenhua Wu, Wen Yang, Wei Huang, Cheng Li, Songyan ChenAbstractThe universal optical absorption is a fascinating property existing in certain two-dimensional (2D) materials. By introducing a general two-band k⋅p effective Hamiltonian, we demonstrate that the absorptance can manifest an universal value at the direct band-edge of 2D materials in three specific cases. However, for general 2D materials, the absorptance becomes nonuniversal. We investigate the dependency of absorptance on the band parameters of general 2D...
Source: Physics Letters A - July 19, 2018 Category: Physics Source Type: research

Effects of rotation on Landau states of electrons on a spherical shell
Publication date: Available online 18 July 2018Source: Physics Letters AAuthor(s): Jonas R.F. Lima, Antônio de Pádua Santos, Márcio M. Cunha, F. MoraesAbstractBased on a previously observed analogy between electromagnetic and non-inertial effects, we investigate the competition between magnetic field and rotation in the quantum motion of an electron constrained to the surface of a sphere. We solve numerically the Schrödinger equation of the problem for the energy eigenvalues and the eigenfunctions and compare the effects of the magnetic field and rotation. We obtain that, for a weak magnetic field,...
Source: Physics Letters A - July 19, 2018 Category: Physics Source Type: research

Almost perfect transport of an entangled two-qubit state through a spin chain
Publication date: Available online 18 July 2018Source: Physics Letters AAuthor(s): Rafael Vieira, Gustavo RigolinAbstractWe show that using a slightly modified XX model for a spin-1/2 chain, one can transmit almost perfectly a maximally entangled two-qubit state from one end of the chain to the other one. This is accomplished without external fields or modulation of the coupling constants among the qubits. We also show that this strategy works for any size of the chain and is relatively robust to imperfections in the coupling constants among the qubits belonging to the chain. Actually, under certain scenarios of small diso...
Source: Physics Letters A - July 19, 2018 Category: Physics Source Type: research

Ground-states and rotational properties of a spin–orbit-coupled spin-1 Bose–Einstein condensate in a concentrically coupled toroidal trap
Publication date: Available online 18 July 2018Source: Physics Letters AAuthor(s): Ping Peng, Guan-Qiang Li, Wen-Li Yang, Zhan-Ying YangAbstractWe investigate the ground states of an antiferromagnetic spin-1 Bose–Einstein condensate with spin–orbit coupling in a concentrically coupled toroidal trap. A new necklace-type state with double-ring structure is created in the system due to the spin–orbit coupling. The petal number of the necklace state is increased with enhancing the strength of the spin–orbit coupling. When the rotation is introduced, the condensate can be dragged into the outer trough of...
Source: Physics Letters A - July 19, 2018 Category: Physics Source Type: research

Crystalline orientation preference for TiO2 nanotube arrays with efficient photoelectrochemical properties
Publication date: Available online 18 July 2018Source: Physics Letters AAuthor(s): Yajun Pang, Guangqing Xu, Qiang Feng, Jun Lv, Yongqiang Qin, Yong Zhang, Zhixiang Zheng, Yucheng WuAbstractNovel TiO2 nanotube arrays (TiO2 NTAs) with preferred oriented crystalline structure were firstly achieved by a facile method through anodizing Ti sheets with textured microstructure. Highly oriented crystalline structure of TiO2 NTAs, with its (004) lattice plane of anatase TiO2 paralleling to the top surface of TiO2 NTAs was identified by the results of XRD, which was further confirmed by the regular diffraction spots and lattice frin...
Source: Physics Letters A - July 19, 2018 Category: Physics Source Type: research

Effect of Coulomb blockade on the switching time of Ag–Ag2S–Pt atomic switches
Publication date: Available online 17 July 2018Source: Physics Letters AAuthor(s): M.M.A. Yajadda, X. GaoAbstractA theoretical model based on the single electron tunneling phenomenon is employed to calculate the time-dependent electrical resistance of an Ag–Ag2S–Pt atomic switch at different applied voltages. While a negative voltage is applied to Pt electrode, Ag atoms precipitate on the surface of Ag2S electrode where they form Ag clusters. The resistance of switch decreases as Ag clusters grow larger between two electrodes. Our model calculations imply the time required to decrease the resistance of switch b...
Source: Physics Letters A - July 18, 2018 Category: Physics Source Type: research

Coherence resonance in an excitable potential well
Publication date: Available online 17 July 2018Source: Physics Letters AAuthor(s): Tatiana R. Bogatenko, Vladimir V. SemenovAbstractThe excitable behaviour is considered as motion of a particle in a potential field in the presence of dissipation. The dynamics of the oscillator proposed in the present paper corresponds to the excitable behaviour in a potential well under condition of positive dissipation. Type-II excitability of the offered system results from intrinsic peculiarities of the potential well, whose shape depends on a system state. Concept of an excitable potential well is introduced. The effect of coherence re...
Source: Physics Letters A - July 18, 2018 Category: Physics Source Type: research

Impact of electron exchange-correlation on drift acoustic solitary waves
Publication date: Available online 17 July 2018Source: Physics Letters AAuthor(s): Q. Haque, S. Ali ShanAbstractThe impact of electron exchange-correlation term on the linear and nonlinear quantum ion (QIA) acoustic drift waves in a highly degenerate plasma is investigated. An analytical approach is employed to derive the differential equation which is later on turned into Sagdeev energy integral equation that can be utilized to get drift solitons under existence conditions. It is noted that phase speed/frequency of the linear drift quantum ion acoustic (QIA) waves increases with electron exchange-correlation effect, but t...
Source: Physics Letters A - July 18, 2018 Category: Physics Source Type: research

Engineering solitons and breathers in a deformed ferromagnet: Effect of localised inhomogeneities
Publication date: Available online 17 July 2018Source: Physics Letters AAuthor(s): M. Saravanan, A. ArnaudonAbstractWe investigate the soliton dynamics of the electromagnetic wave propagating in an inhomogeneous or deformed ferromagnet. The dynamics of magnetization and the propagation of electromagnetic waves are governed by the Landau–Lifshitz–Maxwell (LLM) equation, a certain coupling between the Landau–Lifshitz and Maxwell's equations. In the framework of multiscale analysis, we obtain the perturbed integral modified KdV (PIMKdV) equation. Since the dynamic is governed by the nonlinear integro-differe...
Source: Physics Letters A - July 18, 2018 Category: Physics Source Type: research

Effect of Coulomb blockade on the switching time of Ag-Ag2S-Pt atomic switches
Publication date: Available online 17 July 2018Source: Physics Letters AAuthor(s): M.M.A. Yajadda, X. GaoAbstractA theoretical model based on the single electron tunneling phenomenon is employed to calculate the time-dependent electrical resistance of an Ag-Ag2S-Pt atomic switch at different applied voltages. While a negative voltage is applied to Pt electrode, Ag atoms precipitate on the surface of Ag2S electrode where they form Ag clusters. The resistance of switch decreases as Ag clusters grow larger between two electrodes. Our model calculations imply the time required to decrease the resistance of switch below the res...
Source: Physics Letters A - July 18, 2018 Category: Physics Source Type: research

Superstatistics and temperature fluctuations
Publication date: Available online 17 July 2018Source: Physics Letters AAuthor(s): F. SattinAbstractSuperstatistics [Beck and Cohen (2003) [1]] is a formalism aimed at describing statistical properties of a generic extensive quantity E in complex out-of-equilibrium systems in terms of a linear superposition of equilibrium canonical distributions. The weight function P(β) is argued to be provided by the statistics of the intensive thermodynamic quantity β conjugate to E [Beck (2011) [14]], and therefore is expected to be determined by the spatiotemporal dynamics alone of the system under consideration. In this pap...
Source: Physics Letters A - July 18, 2018 Category: Physics Source Type: research

Recent development and status of magnetoelectric materials and devices
Publication date: Available online 17 July 2018Source: Physics Letters AAuthor(s): Yuxin Cheng, Bin Peng, Zhongqiang Hu, Ziyao Zhou, Ming LiuAbstractThe magnetoelectric (ME) materials and related devices have been attracting increasing research attention over the last few years. They exhibit strong ME coupling effect at room temperature, and electric field control of magnetization or magnetic field control of ferroelectric polarization can be achieved. The ME coupling effect brings novel functionalities to develop ultra-fast, low-power, and miniaturized electronics. Recent progress shows the performance of ME materials is ...
Source: Physics Letters A - July 18, 2018 Category: Physics Source Type: research

Annealing effect of NiO/Co90Fe10 thin films: From bilayer to nanocomposite
Publication date: Available online 17 July 2018Source: Physics Letters AAuthor(s): Xu Li, Yu-Chi Chang, Jiann-Yeu Chen, Ko-Wei Lin, Ryan D. Desautels, Johan van Lierop, Philip W.T. PongAbstractExchange-biased bilayers are widely used in the pinned layers of spintronic devices. While magnetic field annealing (MFA) was routinely engaged during the fabrication of these devices, the annealing effect of NiO/CoFe bilayers is not yet reported. In this paper, the transition from NiO/Co90Fe10 bilayer to nanocomposite single layer was observed through rapid thermal annealing at different temperatures under magnetic field. The as-dep...
Source: Physics Letters A - July 18, 2018 Category: Physics Source Type: research

Self-regulation in infinite populations with fission-death dynamics
Publication date: Available online 14 July 2018Source: Physics Letters AAuthor(s): Yuri Kozitsky, Agnieszka TanaśAbstractThe evolution of an infinite population of interacting point entities placed in Rd is studied. The elementary evolutionary acts are death of an entity with rate that includes a competition term and independent fission into two entities. The population states are probability measures on the corresponding configuration space and the result is the construction of the evolution of states in the class of sub-Poissonian measures, that corresponds to the lack of clusters in such states. This is considered as a...
Source: Physics Letters A - July 14, 2018 Category: Physics Source Type: research

Compression features of high density electron plasma in a long harmonic trap using a rotating wall technique
Publication date: Available online 14 July 2018Source: Physics Letters AAuthor(s): T. MohamedAbstractWe studied radial compression features of electron plasmas in a Penning trap (an assembly of multi-ring electrodes (MRE) housed in a uniform magnetic field) using the rotating wall technique. The magnetic field was 5 T, and the MRE provide a long harmonic potential along the magnetic field axis. The compression features of the plasma were studied by varying the applied rotating electric field frequency, rotating electric field amplitude, compression time, as well as, the magnetic field strength in the Penning trap. The high...
Source: Physics Letters A - July 14, 2018 Category: Physics Source Type: research

An efficient series approximation for the Lévy α-stable symmetric distribution
Publication date: Available online 14 July 2018Source: Physics Letters AAuthor(s): J.C. Crisanto-Neto, M.G.E. da Luz, E.P. Raposo, G.M. ViswanathanAbstractA relevant problem in the statistical and mathematical physics literature is to derive numerically accurate expressions to calculate Lévy α-stable distributions Pα(x;β). On the formal side, important exact results rely on special functions, such as Meijer-G, Fox-H and finite sums of hypergeometric functions, with only a few exceptional cases expressed in terms of elementary functions. Hence, from a more practical point of view, methods such as ser...
Source: Physics Letters A - July 14, 2018 Category: Physics Source Type: research

Condensates in double-well potential with synthetic gauge potentials and vortex seeding
Publication date: 31 August 2018Source: Physics Letters A, Volume 382, Issue 34Author(s): Rukmani Bai, Arko Roy, D. Angom, P. MuruganandamAbstractWe demonstrate an enhancement in the vortex generation when artificial gauge potential is introduced to condensates confined in a double well potential. This is due to the lower energy required to create a vortex in the low condensate density region within the barrier. Furthermore, we study the transport of vortices between the two wells, and show that the traverse time for vortices is longer for the lower height of the well. We also show that the critical value of synthetic magn...
Source: Physics Letters A - July 14, 2018 Category: Physics Source Type: research

Editors
Publication date: 31 August 2018Source: Physics Letters A, Volume 382, Issue 34Author(s): (Source: Physics Letters A)
Source: Physics Letters A - July 14, 2018 Category: Physics Source Type: research

An explicit analytical expression for bed-load layer thickness based on maximum entropy principle
Publication date: 31 August 2018Source: Physics Letters A, Volume 382, Issue 34Author(s): Manotosh Kumbhakar, Snehasis Kundu, Koeli GhoshalAbstractThe present study aims to derive an analytical model on bed-load layer thickness in an open channel turbulent flow carrying sediments. Determination of the thickness of the bed-load layer is of utmost importance in the study of bed-load transport as it is required to determine the bed-load transport rate, as well as in the study of suspended load transport as it acts as reference level for the particles in suspension. Apart from the several deterministic approaches available in ...
Source: Physics Letters A - July 14, 2018 Category: Physics Source Type: research

Quantum inspired evolutionary algorithm for community detection in complex networks
Publication date: 31 August 2018Source: Physics Letters A, Volume 382, Issue 34Author(s): Meng Yuanyuan, Liu XiyuAbstractCommunity structure is indispensable to discover the potential property of complex network systems. In this paper we propose two algorithms (QIEA-net and iQIEA-net) to discover communities in social networks by optimizing modularity. Unlike many existing methods, the proposed algorithms adopt quantum inspired evolutionary algorithm (QIEA) to optimize a population of solutions and do not need to give the number of community beforehand, which is determined by optimizing the value of modularity function and...
Source: Physics Letters A - July 14, 2018 Category: Physics Source Type: research