Combined effect of the perpendicular magnetic field and dilute charged impurity on the electronic phase of bilayer AA-stacked hydrogenated graphene
Publication date: 16 November 2018Source: Physics Letters A, Volume 382, Issue 45Author(s): Bui Dinh Hoi, Mohsen YarmohammadiAbstractWe address the electronic phase engineering in the impurity-infected functionalized bilayer graphene with hydrogen atoms (H-BLG) subjected to a uniform Zeeman magnetic field, employing the tight-binding model, the Green's function technique, and the Born approximation. In particular, the key point of the present work is focused on the electronic density of states (DOS) in the vicinity of the Fermi energy. By exploiting the perturbative picture, we figure out that how the interaction and/or co...
Source: Physics Letters A - October 5, 2018 Category: Physics Source Type: research

Coupling field dependent quantum interference effects in a Λ-system of 87Rb atom
Publication date: Available online 20 September 2018Source: Physics Letters AAuthor(s): Charu Mishra, A. Chakraborty, Vivek Singh, S.P. Ram, V.B. Tiwari, S.R. MishraAbstractA Λ-system in D2 line transition of the R87b atom has been investigated for quantum interference effects for different configurations of coupling field. With a travelling wave coupling field (co-propagating with probe field), the probe beam shows the earlier known electromagnetically induced transparency (EIT) effect at the resonance. With a standing wave coupling field (which is co- and counter-propagating with probe beam), the probe EIT gets tr...
Source: Physics Letters A - September 21, 2018 Category: Physics Source Type: research

Magnetocaloric properties of the spin-S (S ≥ 1) Ising model on a honeycomb lattice
Publication date: Available online 20 September 2018Source: Physics Letters AAuthor(s): Ümit Akinci, Y. Yüksel, E. VatanseverAbstractUsing effective field theory, we have investigated magnetocaloric features of the spin-S Ising model for some spin values S=1,3/2,2,5/2,3 and 7/2 on a honeycomb lattice. Effects of the external magnetic field on the isothermal entropy change, its half-width and also cooling capacity have been determined and discussed in detail. The numerical results show that the isothermal entropy change decreases whereas its half-width and cooling capacity tends to increase when the spin magnitude...
Source: Physics Letters A - September 21, 2018 Category: Physics Source Type: research

Topological phase transition in the quasiperiodic disordered Su–Schriffer–Heeger chain
Publication date: Available online 20 September 2018Source: Physics Letters AAuthor(s): Tong Liu, Hao GuoAbstractWe study the stability of the topological phase in one-dimensional Su–Schrieffer–Heeger chain subject to the quasiperiodic hopping disorder. Two different hopping disorder configurations are investigated, one is the Aubry–André quasiperiodic disorder without mobility edges and the other is the slowly varying quasiperiodic disorder with mobility edges. Interestingly, we find topological phase transitions occur at the critical quasiperiodic disorder strengths which have an exact linear rel...
Source: Physics Letters A - September 21, 2018 Category: Physics Source Type: research

Partial structural restoring of two-qubit transferred state
Publication date: Available online 19 September 2018Source: Physics Letters AAuthor(s): A.I. ZenchukAbstractWe consider the communication line with two-qubit sender and receiver, the later is embedded into the four-qubit extended receiver. Using the optimizing unitary transformation on the extended receiver we restore the structure of the non-diagonal part of an arbitrary initial sender's state at the remote receiver at certain time instant. Obstacles for restoring the diagonal part are discussed. We represent examples of such structural restoring in a communication line of 42 spin-1/2 particles. (Source: Physics Letters A)
Source: Physics Letters A - September 21, 2018 Category: Physics Source Type: research

Dynamics of mixed lump-solitary waves of an extended (2 + 1)-dimensional shallow water wave model
Publication date: Available online 19 September 2018Source: Physics Letters AAuthor(s): Harun-Or-Roshid, Wen-Xiu MaAbstractTo explore the features of lump solutions, which are local in every direction of space, a (2+1)-dimensional extended shallow water wave model is studied, based on its bilinear representation. Several ansatze have been utilized to determine single lump waves, lump-kink waves, single kinks and multi-lumps leading to breathers in terms of function patterns for the model. Through analyzing interactions between solitons, the impact of free parameters involved in the solutions on interaction types is exhibit...
Source: Physics Letters A - September 21, 2018 Category: Physics Source Type: research

Effect of electric field on the electrical conductivity of defected carbon nanotube: Multifractal properties of the wavefunctions
Publication date: Available online 19 September 2018Source: Physics Letters AAuthor(s): S. Behnia, F. RahimiAbstractA theoretical analysis of controllable metal–insulator transition is performed by carrying out a quantum chaos analysis for a single-walled carbon nanotube which is affected by topological Stone–Wales defect. Nanotubes have recently attracted attention as promising materials for flexible nanoelectronic devices. Individual topological Stone–Wales defects have been identified experimentally in carbon nanotubes (CNTs) and graphene. The findings reveal that defected CNT displays a gradual crosso...
Source: Physics Letters A - September 21, 2018 Category: Physics Source Type: research

Energy content in linear mechanical systems with arbitrary time dependence
Publication date: Available online 19 September 2018Source: Physics Letters AAuthor(s): M. Fernandez-GuastiAbstractA novel complementary variables formulation, permits the obtainment of invariants of a mechanical system following the rationale of Abel's differential equation identity. This approach allows for the decomposition of the total energy of the system into the energy of the object and the dynamic energy of the field. The force acting on the object must be linear in the spatial variable but is arbitrary in the time variable. Several examples, such as the time dependent harmonic oscillator and a swing are described ...
Source: Physics Letters A - September 21, 2018 Category: Physics Source Type: research

A transformation theory for camouflaging arbitrary heat sources
Publication date: Available online 14 September 2018Source: Physics Letters AAuthor(s): Liujun Xu, Jiping HuangAbstractCamouflage devices have attracted intensive research interest for their significant applications. However, most camouflage devices are specifically designed according to target heat sources. Here, by applying the transformation thermotics approach, we develop a coordinate transformation, and design an unspecific camouflage device which can camouflage arbitrary heat sources into a circular one with an anisotropic shell. We verify the ability of our unspecific camouflage device with both steady and transient...
Source: Physics Letters A - September 15, 2018 Category: Physics Source Type: research

Effect of Coulomb repulsion on spin and orbital magnetism of cobalt–benzene complex: A relativistic density functional study
Publication date: Available online 12 September 2018Source: Physics Letters AAuthor(s): M. Afshar, M. HematiAbstractWe have demonstrated electronic configurations and magnetic properties of single Co adatom on benzene (Bz) molecule in the framework of relativistic density functional theory. A sequence of fixed spin moment (FSM) calculations were carried out with and without Coulomb repulsion (U). We have investigated that varying the strength of Coulomb repulsion results to different equilibrium positions for the Co adatom on benzene molecule. It was shown that inclusion of the on-site Coulomb repulsion in the Co 3d orbita...
Source: Physics Letters A - September 13, 2018 Category: Physics Source Type: research

Tailoring steep density profile with unstable points
Publication date: Available online 12 September 2018Source: Physics Letters AAuthor(s): Shun Ogawa, Xavier Leoncini, Alexei Vasiliev, Xavier GarbetAbstractThe mesoscopic properties of a plasma in a cylindrical magnetic field are investigated from the view point of test-particle dynamics. When the system has enough time and spatial symmetries, a Hamiltonian of a test particle is completely integrable and can be reduced to a single degree of freedom Hamiltonian for each initial state. The reduced Hamiltonian sometimes has unstable fixed points (saddle points) and associated separatrices. To choose among available dynamically...
Source: Physics Letters A - September 13, 2018 Category: Physics Source Type: research

Application of medium energy plasma focus device in study of radioisotopes
Publication date: Available online 12 September 2018Source: Physics Letters AAuthor(s): Ram Niranjan, R.K. Rout, B.S. Tomar, P.S. Ramanjaneyulu, D.B. Paranjape, T.C. KaushikAbstractPulsed neutrons generated in a plasma focus device are used for the thermal neutron activation analysis (TNAA) of selected three elements having widely different half-lives varying from a few seconds to a few days [Dysprosium (Dy), Manganese (Mn) and Gold (Au)]. Neutron pulse having strength of (1.2±0.3)×109 neutrons/pulse with a pulse width of 46±5ns is produced by “MEPF-12” device operated at a filling gas (deut...
Source: Physics Letters A - September 13, 2018 Category: Physics Source Type: research

Boron nitride nanotubes composed of four- and eight-membered rings
Publication date: Available online 11 September 2018Source: Physics Letters AAuthor(s): Fangfang Li, Junzhe Lu, Guiping Tan, Miaomiao Ma, Xiaoning Wang, Hengjiang ZhuAbstractThe properties of boron nitride nanotubes composed of four- and eight-membered rings (referred to as four-eight-membered rings BNNTs) were calculated using density functional theory (DFT). The calculated results show that the band gap of the four-eight-membered rings BNNTs is greatly reduced, down to a range of 2.530–3.975 eV. The band gap decreases as the number of walls increases, not only enabling the allotropes to show semiconductor propertie...
Source: Physics Letters A - September 12, 2018 Category: Physics Source Type: research

Manipulation of effective thermal conductivity of multilayer thin film by varying thickness ratio of layers using Monte Carlo simulation
Publication date: Available online 11 September 2018Source: Physics Letters AAuthor(s): Xin Ran, Moran WangAbstractUsing the kinetic-type Monte Carlo method, we have simulated the effective thermal conductivity of multilayer thin film with spectral diffuse mismatch model for interface treatment. The results show a monotonously increasing relationship between the thermal conductivity and the material thickness closer to isothermal boundary with a varied size ratio whereas the fixed material amount in two four-layer thin films. This is explained by relatively more significant size effect of the layer closer to the isothermal...
Source: Physics Letters A - September 12, 2018 Category: Physics Source Type: research

Stability analysis of a swarm model with rooted leadership
Publication date: Available online 11 September 2018Source: Physics Letters AAuthor(s): Chun-Hsien LiAbstractIn this paper, we consider the stability of a swarm model, which is typically associated with the phenomenon of maintaining cohesion. In the swarm model, each individual has its own intrinsic nonlinear dynamics and the interaction between individuals follows a rooted leadership topology. We prove that, if the corresponding real symmetric matrix is negative definite, then the swarm is stable in the sense that all individuals will eventually form a cohesive swarm. In addition, we obtain the bounds of the swarm size. N...
Source: Physics Letters A - September 12, 2018 Category: Physics Source Type: research

Influence of noise on frequency responses of softening Duffing oscillators
Publication date: Available online 10 September 2018Source: Physics Letters AAuthor(s): Vipin Agarwal, Xie Zheng, Balakumar BalachandranAbstractIn the present study, the influence of noise on the responses of continuous-time dynamical systems are considered. In particular, the influence of white Gaussian noise on the frequency responses of monostable and bistable, softening Duffing oscillators are studied. A combination of experimental, analytical, and numerical studies are undertaken to understand the shifting of jump-up and jump-down frequencies and an eventual collapse of upper and lower responses branches of into one r...
Source: Physics Letters A - September 11, 2018 Category: Physics Source Type: research

Room temperature ferromagnetism in Cu–Gd co-doped GaN nanowires: A first-principles study
Publication date: Available online 11 September 2018Source: Physics Letters AAuthor(s): Ruikuan Xie, Huaizhong Xing, Yijie Zeng, Yan Huang, Aijiang Lu, Xiaoshuang ChenAbstractThe electronic structure and room temperature ferromagnetism of wurtzite Cu–Gd co-doped GaN nanowires have been investigated by means of the first-principles calculations within the density functional theory, including the on-site Coulomb energy U. The magnetic coupling between Gd atoms in the Gd-doped GaN nanowire is paramagnetic instead of ferromagnetic (FM) as in the bulk structure. After replacing Ga with Cu atom we find a stable FM coupling...
Source: Physics Letters A - September 11, 2018 Category: Physics Source Type: research

A possible unification of Newton's and Coulomb's forces
Publication date: Available online 7 September 2018Source: Physics Letters AAuthor(s): J.C. CaillonAbstractWe have considered electric charge as the fourth component of the particle momentum in five-dimensional space–time. The fifth dimension has been compactified on a circle with an extremely small radius determined from the fundamental physics constants. First, we have given equations in the framework of five-dimensional special relativity and determined the corresponding reduction to four-dimensional space–time. Then, in order to obtain an appropriate charge-to-mass ratio and to avoid the Fourier modes probl...
Source: Physics Letters A - September 8, 2018 Category: Physics Source Type: research

Erratum to “Rattleback: A model of how geometric singularity induces dynamic chirality” [Phys. Lett. A 381 (2017) 2772]
Publication date: Available online 7 September 2018Source: Physics Letters AAuthor(s): Z. Yoshida, T. Tokieda, P.J. Morrison (Source: Physics Letters A)
Source: Physics Letters A - September 8, 2018 Category: Physics Source Type: research

Field-induced spin-polarized electronic and optical properties of armchair stanene nanoribbons
Publication date: Available online 7 September 2018Source: Physics Letters AAuthor(s): Feng-Lin ShyuAbstractElectronic and optical properties of armchair stanene nanoribbons are studied within the sp3 tight-binding model including spin-orbit coupling in the presence of in-plane electric field. Electric field strongly modulates energy dispersions leading to a zero-gap transition, shift in edge-states, and exhibition of spin-splitting states. Then, the complex dielectric functions in the long wavelength limit is calculated from the gradient approximation. More field-induced transition channels exhibit richer optical spectra ...
Source: Physics Letters A - September 8, 2018 Category: Physics Source Type: research

Editors
Publication date: 26 October 2018Source: Physics Letters A, Volume 382, Issues 42–43Author(s): (Source: Physics Letters A)
Source: Physics Letters A - September 8, 2018 Category: Physics Source Type: research

Ferromagnetic phases due to competing short- and long-range interactions in the spin-5/2 and spin-2 Blume-Capel model
Publication date: Available online 6 September 2018Source: Physics Letters AAuthor(s): Octavio D. Rodriguez Salmon, Minos A. Neto, Francisco Dinóla Neto, Denis Américo Murillo Pariona, Justo Rojas TapiaAbstractWe broaden the study of the statistical physics of the spin-S Blume-Capel model with ferromagnetic mean-field interactions J in competition with short-range antiferromagnetic interactions K in a linear chain in the thermodynamic limit. This work is dedictated to the case when S takes the half-integer spin S=5/2 and when S assumes the integer value S=2. In both cases the phase diagrams exhibit new ferrom...
Source: Physics Letters A - September 7, 2018 Category: Physics Source Type: research

Propagation modes of extraordinary wave in magnetized quantum plasma with electron spin-1/2 and exchange correlation effects
Publication date: Available online 5 September 2018Source: Physics Letters AAuthor(s): Tripti RimzaAbstractThe dispersion properties of high-frequency elliptically polarized electromagnetic wave is studied in electron–ion spin-1/2 quantum plasma with exchange effect. The quantum magnetohydrodynamic set of equations is used to derive the dispersion relation of extraordinary wave which is found to be modified due to combined effect of spin and exchange correlation potential. The dispersion relation is further discussed for two possible modes of propagation namely lower branch and upper branch of extraordinary wave. The...
Source: Physics Letters A - September 6, 2018 Category: Physics Source Type: research

A physical pathway to understand individual's labeling behavior in signed social networks
Publication date: Available online 6 September 2018Source: Physics Letters AAuthor(s): Long Guo, Ke Ma, Zhong-Jie LuoAbstractIn this paper we propose a reshuffling approach to empirical analyze individual's labeling behavior in signed social networks. In our approach, each individual is assumed to have the ability to re-label his/her neighbors randomly with the parameters ps and p+. Many reshuffled networks, which have the same topological structure and different signs' configuration, are built through applying our approach to the given three signed social networks. The entropy Sout and the giant component ρG for each ...
Source: Physics Letters A - September 6, 2018 Category: Physics Source Type: research

Dynamic behavior of temperature field in a buoyancy-driven turbulent fire
Publication date: Available online 5 September 2018Source: Physics Letters AAuthor(s): Kazushi Takagi, Hiroshi Gotoda, Isao T. Tokuda, Takaya MiyanoAbstractWe study the dynamic behavior of temperature field in a buoyancy-driven turbulent fire from the viewpoints of symbolic dynamics, complex networks, and statistical complexity. The permutation entropy and the horizontal visibility network entropy allow us to capture the subtle changes in temperature fluctuations. The possible existence of deterministic chaos in temperature fluctuations, as well as in streamwise flow velocity fluctuations Takagi et al. (2017) [6], is clear...
Source: Physics Letters A - September 5, 2018 Category: Physics Source Type: research

Spin transport investigation of two type silicene nanoribbons heterostructure
Publication date: Available online 5 September 2018Source: Physics Letters AAuthor(s): X.Q. Deng, R.Q. ShengAbstractBased on first principles calculation method, we design and investigate the spin transport properties of two type heterostructures based on zigzag silicene nanoribbons (ZSiNRs). The first one consists of hydrogen-terminated ZSiNR (ZSiNR-H) and Rx-terminated ZSiNR (ZSiNR-Rx), here, Rx=O, S, P. The rectification behavior can be observed for heterostructures consisting of ZSiNR-H and ZSiNR-O (ZSiNR-S). The second one can be fabricated with a ZSiNR-Rx central scatter region between two ZSiNR-H electrodes. The res...
Source: Physics Letters A - September 5, 2018 Category: Physics Source Type: research

Effects of salt on solute association behavior in nanoconfined aqueous solutions
Publication date: Available online 5 September 2018Source: Physics Letters AAuthor(s): Liang Zhao, Mang Chen, Xian Wang, Jinge Yang, Zhimin Shi, Qian Chen, Jingqiu Song, Wenhui Shen, Yusong TuAbstractUsing molecular dynamics simulations, we have studied the effects of salt on the association behavior of solute molecules in nanoconfined aqueous solutions. Three types of solute association states – dispersion, reversible and aggregation states – are still observed in nanoconfined aqueous solutions in the presence of salt. With the increase of ion concentration, the tendency toward the formation of larger clusters...
Source: Physics Letters A - September 5, 2018 Category: Physics Source Type: research

Enhancement of charge and spin Seebeck effect in triple quantum dots coupling to ferromagnetic and superconducting electrodes
Publication date: Available online 5 September 2018Source: Physics Letters AAuthor(s): Hui Yao, Chao Zhang, Peng-bin Niu, Zhi-Jian Li, Yi-Hang NieAbstractWe theoretically study the thermoelectric transport properties through a triple quantum dots (QDs) device with the central QD coupled to a ferromagnetic lead, a superconducting one, and two side QDs with spin-dependent interdot tunneling coupling. The thermoelectric coefficients are calculated in the linear response regime by means of nonequilibrium Green's function method. The thermopower is determined by the single-electron tunneling processes at the edge of superconduc...
Source: Physics Letters A - September 5, 2018 Category: Physics Source Type: research

Editors
Publication date: 18 October 2018Source: Physics Letters A, Volume 382, Issue 41Author(s): (Source: Physics Letters A)
Source: Physics Letters A - September 5, 2018 Category: Physics Source Type: research

Hybrid Weyl semimetal under crossed electric and magnetic fields: Field tuning of spectrum type
Publication date: Available online 31 August 2018Source: Physics Letters AAuthor(s): Z.Z. AlisultanovAbstractThere are two types (WSM-I and WSM-II) of the WSMs. The WSMs of different types have various topological and transport properties. Besides pure WSM-I and WSM-II, there exists a novel type, dubbed “hybrid Weyl semimetal”, which contains the Weyl points of both types. In this Letter we consider the hybrid WSM under crossed magnetic and electric fields. The electromagnetic field induces transition between different types of spectrum in Weyl point (WP). Thus, hybrid phase of the WSM can be tunable using the ...
Source: Physics Letters A - September 1, 2018 Category: Physics Source Type: research

Polarization switch in an elliptical micropillar – quantum dot system induced by a magnetic field in Faraday configuration
Publication date: Available online 31 August 2018Source: Physics Letters AAuthor(s): C.A. Jiménez-Orjuela, H. Vinck-Posada, José M. Villas-BôasAbstractIn this paper we study the effect of applying a magnetic field on an elliptical microcavity pillar with quantum dots embedded, in the presence of external laser excitation. To obtain the system dynamics we use the matrix density formalism, taking into account realistic parameters and including losses. Our results show that it is possible to use the magnetic field strength to control the polarization of the photons inside the cavity, making our system beha...
Source: Physics Letters A - September 1, 2018 Category: Physics Source Type: research

The uniaxial stress tunable optical gain of InAs nanowires
Publication date: Available online 31 August 2018Source: Physics Letters AAuthor(s): Wen Xiong, Jian-Wei WangAbstractWe calculate the electronic structures and optical gain of InAs nanowires via the eight-band effective-mass k⋅p theory. It is found that there is one peak in TM gain spectra, and the peak value of TM gain spectra is much larger than that of TE gain spectra when the radius R of the nanowires is 3 nm. Meanwhile, as the radius increases, the peak value of TE gain spectra approaches that of TM gain spectra, and more peaks appear in both TM and TE gain spectra. We therefore predict that InAs nanowires with R...
Source: Physics Letters A - September 1, 2018 Category: Physics Source Type: research

Photon-number dependent cavity vacuum induced transparency and single photon separation
Publication date: Available online 31 August 2018Source: Physics Letters AAuthor(s): Shuangli Fan, Hui Sun, Hongjun Zhang, Hong GuoAbstractWe investigate photon-number dependent cavity vacuum induced transparency and magneto-optical rotation in a cavity quantum electrodynamics system, which consists of two cavities and an ensemble of Λ-type atoms. We demonstrate that the probe photon coupled into one cavity can be transferred to the mode of another cavity via coherent Raman scattering. The transmission, the phase shift, as well as the vacuum Rabi splitting therefore strongly depend upon the probe photon number coupl...
Source: Physics Letters A - September 1, 2018 Category: Physics Source Type: research

Focusing of Fe3O4 nanoparticles using a rotating magnetic field in various environments
Publication date: Available online 29 August 2018Source: Physics Letters AAuthor(s): Ryszard Krzyminiewski, Bernadeta Dobosz, Grzegorz Schroeder, Joanna KurczewskaAbstractThe paper shows the application of a new method – Magnetic Nanoparticles Focusing 3D, MNF-3D – for focusing of magnetic nanoparticles at any point in a three-dimensional space between the rotating magnet system. The results of focusing process of nanoparticles in water, human blood, human serum and polyurethane sponge are presented. Additionally, blood flow was also considered. The effectiveness of nanoparticle focusing was monitored optically...
Source: Physics Letters A - August 31, 2018 Category: Physics Source Type: research

Spin and charge Nernst effect in a four-terminal double-dot interferometer
Publication date: Available online 29 August 2018Source: Physics Letters AAuthor(s): Feng Liang, Dong Zhang, Ben-Ling Gao, Guang Song, Yu GuAbstractWe investigate the spin and charge Nernst effect of a four-terminal Aharonov–Bohm interferometer with Rashba spin–orbit interaction (RSOI). It is shown that a pure spin Nernst effect or a fully spin-polarized Nernst effect can be obtained by modulating the magnetic flux phase ϕ and the RSOI induced phase φ. It is also demonstrated that some windows of ϕ (or φ) for maintaining an almost fully spin-polarized Nernst effect exist and their width is under the c...
Source: Physics Letters A - August 31, 2018 Category: Physics Source Type: research

An optimization-based overtaking model for unidirectional pedestrian flow
Publication date: Available online 27 August 2018Source: Physics Letters AAuthor(s): Dawei Zhang, Haitao Zhu, Lei Du, Simo HostikkaAbstractWe propose an optimization-based model for simulating the overtaking behaviour in the unidirectional pedestrian flow. A ‘visual area’ is introduced so that agents could receive the information regarding their surroundings and react by choosing one of three options: to move straight on, to dodge to the left, or to dodge to the right. And a side preference of each pedestrian for evading and overtaking is implemented based on traffic ‘social norms’. The model was va...
Source: Physics Letters A - August 28, 2018 Category: Physics Source Type: research

Superdense tI12 carbon: Unexpectedly high elastic moduli but low ideal strength
Publication date: Available online 27 August 2018Source: Physics Letters AAuthor(s): Mingyan Li, Xinxin Zhang, Yu ZhaoAbstractThe basic physical and chemical properties of new carbon allotropies are important to explore their further technique and industrial applications. Here, a systematic theoretical investigation on the electronic, dynamical, and elastic properties for the superdense carbon (tI12) are performed, especially the ideal tensile and shear strength and the corresponding bond-breaking modes are explored to uncover its intrinsic mechanical nature and the corresponding bond-breaking modes. Our results show that ...
Source: Physics Letters A - August 28, 2018 Category: Physics Source Type: research

Helical solitons in vector modified Korteweg–de Vries equations
Publication date: Available online 27 August 2018Source: Physics Letters AAuthor(s): Dmitry E. Pelinovsky, Yury A. StepanyantsAbstractWe study existence of helical solitons in the vector modified Korteweg–de Vries (mKdV) equations one of which is integrable, whereas another one in non-integrable. The latter one describes nonlinear waves in various physical systems, including plasma and chains of particles connected by elastic springs. By using the dynamical system methods such as the blow-up near singular points and the construction of invariant manifolds, we construct helical solitons by the efficient shooting metho...
Source: Physics Letters A - August 28, 2018 Category: Physics Source Type: research

Structural, electronic and magnetic properties of hydrogenated BC2N
Publication date: Available online 24 August 2018Source: Physics Letters AAuthor(s): Xiaoling Lü, Shuhui Lv, Yu Shen, Zhenjun Si, Yisong Zheng, Qian DuanAbstractDensity functional theory has been used to study the electronic and magnetic properties as well as the stability on the hydrogenated BC2N sheets. It is found that two different structures (BC2NH-I and BC2NH-II) with the ferromagnetic ground states can be formed when removing the H atoms from one side of semi-hydrogenated BC2N sheet. By applying tensile strain, both of their magnetisms are robust to 2.0 μB. However, the magnetisms are sensitively changed by ...
Source: Physics Letters A - August 25, 2018 Category: Physics Source Type: research

Three-dimensional quantum Hall effect in Weyl and double-Weyl semimetals
Publication date: Available online 24 August 2018Source: Physics Letters AAuthor(s): Zhi-Peng Gao, Zhi Li, Dan-Wei ZhangAbstractThe well-known quantum Hall effect (QHE) was usually studied in 2D systems. In this work, we investigate the integer QHE in 3D Weyl and double-Weyl semimetals. Based on the lattice models of Weyl and double-Weyl semimetals subjected to a uniform magnetic field, we derive the generalized 3D spinfull Hofstadter Hamiltonians and Harper equations for the two systems, and obtain their corresponding energy spectra. Furthermore, we show that for proper hopping parameters and rational magnetic fluxes, bot...
Source: Physics Letters A - August 25, 2018 Category: Physics Source Type: research

Conductance of Rashba electron in a quantum waveguide with smooth boundary
Publication date: Available online 24 August 2018Source: Physics Letters AAuthor(s): Duan-Yang Liu, Yi-Zhu Lin, Jian-Bai XiaAbstractBy using the transfer matrix method, we theoretically investigated Rashba electron's spin transport in a straight waveguide with a stub which has a smooth boundary. It is proved that the two spin states propagate independently. The conductance of the waveguide has been calculated. Conductance quantization is common in this structure when we change the Fermi energy and the width of the stub. If the shape of the stub converges toward the limit–a quadrate stub, the conductance will reduce d...
Source: Physics Letters A - August 25, 2018 Category: Physics Source Type: research

Non-phononic mechanism of superconductivity in pure semi-metallic Bismuth single crystal at sub-milli Kelvin
Publication date: Available online 24 August 2018Source: Physics Letters AAuthor(s): S.P. Tewari, Charu KapoorAbstractVery recently, the elusive phenomenon of superconductivity in pure semi-metallic Bismuth single crystal has been experimentally observed at extremely low transition temperature of 0.53 mK. Electrons, charged fermions, in this crystal form a very rare gas with interparticle separation of nearly 185A˚. But it is a highly quantum mechanical degenerate gas at such a low temperature with thermal de Broglie wavelength equal to a fraction of a million Angstrom. In such a dilute system the peculiar oscillatory beh...
Source: Physics Letters A - August 25, 2018 Category: Physics Source Type: research

Editors
Publication date: 12 October 2018Source: Physics Letters A, Volume 382, Issue 40Author(s): (Source: Physics Letters A)
Source: Physics Letters A - August 25, 2018 Category: Physics Source Type: research

Peregrine solitons and gradient catastrophes in discrete nonlinear Schrödinger systems
Publication date: Available online 23 August 2018Source: Physics Letters AAuthor(s): C. Hoffmann, E.G. Charalampidis, D.J. Frantzeskakis, P.G. KevrekidisAbstractIn the present work, we examine the potential robustness of extreme wave events associated with large amplitude fluctuations of the Peregrine soliton type, upon departure from the integrable analogue of the discrete nonlinear Schrödinger (DNLS) equation, namely the Ablowitz–Ladik (AL) model. Our model of choice will be the so-called Salerno model, which interpolates between the AL and the DNLS models. We find that rogue wave events essentially are drasti...
Source: Physics Letters A - August 23, 2018 Category: Physics Source Type: research

A 200-W permanent magnet Hall thruster discharge with graphite channel wall
Publication date: Available online 23 August 2018Source: Physics Letters AAuthor(s): Yongjie Ding, Hong Li, Hezhi Sun, Liqiu Wei, Jia Boyang, Su Hongbo, Wuji Peng, Peng Li, Daren YuAbstractA 200-W Hall thruster was designed using permanent magnets placing the axial maximum magnetic field outside of the channel, and the anode/gas distributor as an integrated U-shaped structure. A split structure is adopted for the discharge channel to conveniently change the wall material. With the initial conditions that the anode mass flow is maintained at 0.8 mg/s, 1.0 mg/s and 1.2 mg/s over a voltage range of 150–400 V (at 50 V in...
Source: Physics Letters A - August 23, 2018 Category: Physics Source Type: research

Chaos and Reverse Transitions in Stochastic Resonance
Publication date: Available online 23 August 2018Source: Physics Letters AAuthor(s): Jinming Liu, Jian Mao, Bin Huang, Peiguo LiuAbstractStochastic resonance is a phenomenon that a weak signal can be amplified and optimized by the assistance of noise in bistable system. There is still not enough research on the mutual interplay among system, noise and signal. In this paper, we study the role of every parameter in nonlinear transfer and discover chaos phenomenon in stochastic resonance. To measure the influence of chaos, a trajectory decision function was proposed. Based on this function, we found two forms of stochastic re...
Source: Physics Letters A - August 23, 2018 Category: Physics Source Type: research

Noise-induced chaos in non-linear dynamics of El Niños
Publication date: Available online 23 August 2018Source: Physics Letters AAuthor(s): D.V. Alexandrov, I.A. Bashkirtseva, L.B. RyashkoAbstractMotivated by an important practical significance, we analyze the noise-induced El Niño evolutionary equations. Our analysis based on the evaluation of largest Lyapunov exponents demonstrates the new effects of deterministic and stochastic dynamics of the El Niño–Southern Oscillation Events. We show that the non-linear deterministic model possesses either a multiturn limit cycle with regular self-oscillations or chaotic oscillations depending on slight variations of...
Source: Physics Letters A - August 23, 2018 Category: Physics Source Type: research

Basic properties of nonlinear surface charge waves at a plasma boundary
Publication date: Available online 23 August 2018Source: Physics Letters AAuthor(s): O.M. Gradov, L. StenfloAbstractThe nonlinear properties of surface charges are here analyzed under ideal conditions. We thus deduce a new single equation from the wellknown equations which govern the cold electron plasma motion. Simple formulas that describe the propagation of surface charge perturbations along the plasma boundary are also found. (Source: Physics Letters A)
Source: Physics Letters A - August 23, 2018 Category: Physics Source Type: research

M-indeterminate distributions in quantum mechanics and the non-overlapping wave function paradox
Publication date: Available online 17 August 2018Source: Physics Letters AAuthor(s): R. Sala Mayato, P. Loughlin, L. CohenAbstractWe consider the non-overlapping wave function paradox of Aharanov et al., wherein the relative phase between two wave functions cannot be measured by the moments of position or momentum. We show that there is an unlimited number of other expectation values that depend on the phase. We further show that the Wigner distribution is M-indeterminate, that is, a distribution whose moments do not uniquely determine the distribution. We generalize to more than two non-overlapping functions. We consider ...
Source: Physics Letters A - August 18, 2018 Category: Physics Source Type: research

Editors
Publication date: 5 October 2018Source: Physics Letters A, Volume 382, Issue 39Author(s): (Source: Physics Letters A)
Source: Physics Letters A - August 18, 2018 Category: Physics Source Type: research