**Research on bandgap property of a novel small size multi-band phononic crystal**

Publication date: Available online 12 November 2018Source: Physics Letters AAuthor(s): Yake Dong, Hong Yao, Jun Du, Jingbo Zhao, Chao DingAbstractA novel small size multi-band gaps phononic crystal (hPC) composed of the periodic plumbum and aluminum mass has been investigated in this paper, we calculated the dispersion relations and the displacement fields with finite element method (FEM). The influences of the geometrical parameters and materials parameters on the band structure are further investigated. We studied the influence factors of band gap by the model of origin anti-resonance. There are many flat bands in the ch...

**Source: **Physics Letters A - November 14, 2018 **Category: **Physics **Source Type: **research

**Monodromy in non-integrable systems on certain compact classical phase spaces**

Publication date: Available online 12 November 2018Source: Physics Letters AAuthor(s): Dmitrií A. Sadovskií, Boris I. ZhilinskiíAbstractOn the example of bending vibrational polyads of the acetylene molecule (C2H2) in the approximation of the 1:1:1:1 resonant oscillator with axial symmetry, whose geometry is similar to the n-shell approximation of the perturbed hydrogen atom, we show how remaining invariant tori of the underlying classical non-integrable system form a nontrivial continuous family with monodromy. We read this monodromy off the quantum energy spectrum which was observed experimentally by...

**Source: **Physics Letters A - November 14, 2018 **Category: **Physics **Source Type: **research

**Spontaneous breaking of one-dimensional chains investigated with scanning tunneling microscopy**

Publication date: Available online 12 November 2018Source: Physics Letters AAuthor(s): Xueying ZhaoAbstractLandau (1937) [1] had an argument that one-dimensional long chains are not stable at finite temperature, and will break into short sections due to thermal fluctuation. However, until recently, fragmentation of one-dimensional chains by formation of thermal vacancies was first discovered in Bagatskii et al. (2014) [6] for the Xenon that physically adsorbed in the grooves of single-walled carbon nanotube bundles. In this work, scanning tunneling microscopy (STM) was first used to observe the influence of thermal fluctua...

**Source: **Physics Letters A - November 14, 2018 **Category: **Physics **Source Type: **research

**Interaction of solitons with impurities in anisotropic ferromagnetic chains**

Publication date: Available online 13 November 2018Source: Physics Letters AAuthor(s): R.S. Kamburova, S.K. Varbev, M.T. PrimatarowaAbstractThe interaction of bright solitons with impurities in the on-site anisotropy of a ferromagnetic chain is studied. This type of impurities leads to linear and nonlinear perturbing terms in the corresponding nonlinear Schrödinger equation. We have found static soliton-impurity bound states and considered the conditions for their formation. For large values of the anisotropy the character of the impurities is mainly linear. The interaction of propagating solitons with the impurities ...

**Source: **Physics Letters A - November 14, 2018 **Category: **Physics **Source Type: **research

**Editors**

Publication date: 12 January 2019Source: Physics Letters A, Volume 383, Issues 2–3Author(s): (Source: Physics Letters A)

**Source: **Physics Letters A - November 14, 2018 **Category: **Physics **Source Type: **research

**Directed Percolation Phase Transition at the Onset of STI in an Inhomogeneous Coupled Map Lattice**

Publication date: Available online 9 November 2018Source: Physics Letters AAuthor(s): Sujay Biswas, Alaka DasAbstractA model for inhomogeneously coupled logistic maps is considered to find some critical exponents in the transition from inhomogeneous steady state to spatiotemporal chaos through spatiotemporal intermittency. The laminar state in the model is described by inhomogeneous steady state with spatial period two. We obtain a complete set of static exponents which match with the corresponding directed percolation(DP) values in (1+1) dimension. We also find four nonuniversal spreading exponents in which three exponent...

**Source: **Physics Letters A - November 11, 2018 **Category: **Physics **Source Type: **research

**Formation of a small ‘bead lightning’ in a half-microsecond discharge in air**

Publication date: Available online 7 November 2018Source: Physics Letters AAuthor(s): D.V. Beloplotov, V.F. TarasenkoAbstractThe formation of periodic plasma clots which form a discharge channel similar to bead lightning has been studied with a four-channel intensified charge-coupled device (ICCD) camera simultaneously with the recording of voltage and current waveforms. It was found that a diffuse discharge was formed at the initial stage due to the development of a wide streamer. Runaway electrons were registered. Beads were formed as a result of the development of the spark leader after the diffuse stage. It was assumed...

**Source: **Physics Letters A - November 8, 2018 **Category: **Physics **Source Type: **research

**Comment on ‘Deterministic CNOT gate and entanglement swapping for photonic qubits using a quantum-dot spin in a double-sided optical microcavity’ by H.F. Wang et al., Physics Letters A 377, 2870–2876 (2013)**

Publication date: Available online 7 November 2018Source: Physics Letters AAuthor(s): Amor Gueddana, Vasudevan Lakshminarayanan (Source: Physics Letters A)

**Source: **Physics Letters A - November 8, 2018 **Category: **Physics **Source Type: **research

**Comparing mechanical analysis with generalized-competitive-mode analysis for the plasma chaotic system**

Publication date: Available online 7 November 2018Source: Physics Letters AAuthor(s): Yingjuan Yang, Guoyuan QiAbstractThe plasma chaotic system is a dissipative dynamical system modeled by a parametric plasma instability arising from the interaction of the whistler and ion acoustic waves with the plasma oscillation near the lower hybrid resonance. The amplitudes of these three oscillations obey a three-dimensional system of ordinary differential equations that exhibits chaos for certain parameter values. Besides the maximal Lyapunov exponent technique, a generalized-competitive-mode (GCM) technique has been proposed to ev...

**Source: **Physics Letters A - November 8, 2018 **Category: **Physics **Source Type: **research

**On the effect of fractional statistics on quantum ion acoustic waves**

Publication date: Available online 6 November 2018Source: Physics Letters AAuthor(s): Kamel OurabahAbstractIn this paper, I study the effect of a small deviation from the Fermi–Dirac statistics on the quantum ion acoustic waves. For this purpose, a quantum hydrodynamic model is developed based on the Polychronakos statistics, which allows for a smooth interpolation between the Fermi and Bose limits, passing through the case of classical particles. The model includes the effect of pressure as well as quantum diffraction effects through the Bohm potential. The equation of state for electrons obeying fractional statisti...

**Source: **Physics Letters A - November 7, 2018 **Category: **Physics **Source Type: **research

**On the dynamics of the Szekeres system**

We describe the dynamics of the Szekeres system when one of these two rational first integrals is negative, showing that all the orbits come from the infinity of R4 and go to infinity. (Source: Physics Letters A)

**Source: **Physics Letters A - November 7, 2018 **Category: **Physics **Source Type: **research

**Electric double layer of electrons: Attraction between two like-charged surfaces induced by Fermi–Dirac statistics**

Publication date: Available online 6 November 2018Source: Physics Letters AAuthor(s): Mitja Drab, Veronika Kralj-IgličAbstractRecently we reported that Fermi–Dirac statistics of electrons contained between two oppositely charged surfaces separated by the order of nanometers create overlapping electric double layers with repulsive total force between the surfaces. Here, we present a new branch of solutions to the same variational problem resulting in higher energy densities and identify regions of the phase space where the force between two like-charged surfaces is attractive. (Source: Physics Letters A)

**Source: **Physics Letters A - November 7, 2018 **Category: **Physics **Source Type: **research

**Efficient scheme for passive decoy-state reference-frame-independent quantum key distribution**

Publication date: Available online 5 November 2018Source: Physics Letters AAuthor(s): Jian-Rong Zhu, Chun-Mei Zhang, Qin WangAbstractReference-frame-independent quantum key distribution (RFI-QKD) has been demonstrated to be reliable and useful both in theories and experiments, which is intrinsically robust against slowly varying reference frames. In this paper, we propose an efficient scheme of passive decoy-state RFI-QKD based on the parametric down-conversion source, where a beam splitter splits the idler pulses into four local detection events to improve the performance of RFI-QKD systems. In addition, we demonstrate th...

**Source: **Physics Letters A - November 6, 2018 **Category: **Physics **Source Type: **research

**True spin and pseudo spin entanglement around Dirac Points in graphene with Rashba spin–orbit interaction**

Publication date: Available online 5 November 2018Source: Physics Letters AAuthor(s): Zheng Liu, Chao Zhang, J.C. CaoAbstractWe analytically obtained the Schmidt decomposition of the entangled state between the pseudo spin and the true spin in graphene with Rashba spin–orbit coupling. The entangled state has the standard form of the Bell state, where the SU(2) spin symmetry is broken. These states can be explicitly expressed as the superposition of two nonorthogonal, but mirror symmetrical spin states entangled with the pseudo spin states. Because of the closely locking between the pseudo spin and the true spin, it i...

**Source: **Physics Letters A - November 6, 2018 **Category: **Physics **Source Type: **research

**Improving direct state measurements by using rebits in real enlarged Hilbert spaces**

Publication date: Available online 5 November 2018Source: Physics Letters AAuthor(s): Le Bin HoAbstractWe propose a protocol to improve the accuracy of direct complex state measurements (DSM) by using rebits in real Hilbert spaces. We show that to improve the accuracy, the initial complex state should be decomposed into the real and imaginary parts and stored in an extended state (rebit) which can be tracked individually by two bases of an extra qubit. For pure states, the numerical calculations show that the trace distances between the true state and the reconstructed state obtained from the rebit method are more precise ...

**Source: **Physics Letters A - November 6, 2018 **Category: **Physics **Source Type: **research

**Effect of non-metallic X(X=F, N, S) and Cr co-doping on properties of BiFeO3: A first-principles study**

In this study, the structural, magnetic, electric and optical properties in X (X=F, N, S) and Cr co-doped BiFeO3 (BFO) are calculated using the density functional theory. For Cr–X co-doping case, the structure of BFO undergo a phase transition from monoclinic to triclinic structure accompanying net magnetic moments of 5.92 μB, 6.04 μB and 7.80 μB, for Cr–F co-doping, Cr–N co-doping and Cr–S co-doping, respectively. The underlying physical mechanisms are the lattice distortions tunned by doping. The decreased Fe–O–Fe bond angles and Fe–O bond lengths will bring weak antifer...

**Source: **Physics Letters A - November 2, 2018 **Category: **Physics **Source Type: **research

**Impact of non-uniform heat sink/source and convective condition in radiative heat transfer to Oldroyd-B nanofluid: A revised proposed relation**

Publication date: Available online 31 October 2018Source: Physics Letters AAuthor(s): M. Irfan, M. Khan, W.A. KhanAbstractNanofluids are embryonic as auspicious thermo liquids for application of heat transfer which have been scrutinized precisely, in current eons. Thermo-physical properties of these liquids have noteworthy stimulus on their heat transfer features. The manifestation of dense nanoparticles in the base liquid ominously intensifies the effective liquid thermal conductivity and therefore heightens the features of heat transfer. The highest attention of this exertion is to investigate the features of nanoparticl...

**Source: **Physics Letters A - November 1, 2018 **Category: **Physics **Source Type: **research

**Hjelmslev quadrilateral central configurations**

Publication date: Available online 30 October 2018Source: Physics Letters AAuthor(s): M. Alvarez-Ramírez, J. LlibreAbstractA Hjelmslev quadrilateral is a quadrilateral with two right angles at opposite vertices. Using mutual distances as coordinates, we show that any four-body central configuration forming a Hjelmslev quadrilateral must be a right kite configuration. (Source: Physics Letters A)

**Source: **Physics Letters A - October 31, 2018 **Category: **Physics **Source Type: **research

**Quasi-exactly solvable quantum systems with explicitly time-dependent Hamiltonians**

Publication date: Available online 30 October 2018Source: Physics Letters AAuthor(s): Andreas Fring, Thomas FrithAbstractFor a large class of time-dependent non-Hermitian Hamiltonians expressed in terms linear and bilinear combinations of the generators for an Euclidean Lie-algebra respecting different types of PT-symmetries, we find explicit solutions to the time-dependent Dyson equation. A specific Hermitian model with explicit time-dependence is analyzed further and shown to be quasi-exactly solvable. Technically we constructed the Lewis–Riesenfeld invariants making use of the metric picture, which is an equivalen...

**Source: **Physics Letters A - October 31, 2018 **Category: **Physics **Source Type: **research

**Solitary waves in a long structure of charged particles confined in the linear Paul trap**

Publication date: Available online 31 October 2018Source: Physics Letters AAuthor(s): R. Syrovatka, Yu. Medvedev, V. Filinov, L. Vasilyak, L. Deputatova, V. Vladimirov, V. PecherkinAbstractThis paper demonstrates the possibility of generation of density waves in the form of individual humps in a long structure of the one-component Coulomb system of dust particles confined in the linear Paul traps in air under normal conditions Our numerical simulations by particle-in-cell method support this possibility. Physical possibilty of analogous the hump density waves (caustics) is discussed by V. I. Arnold in his book ‘Catas...

**Source: **Physics Letters A - October 31, 2018 **Category: **Physics **Source Type: **research

**New findings for two new type sine hyperbolic potentials**

Publication date: Available online 29 October 2018Source: Physics Letters AAuthor(s): Qian Dong, Guo-Hua Sun, Jian Jing, Shi-Hai DongAbstractWe propose two new type sine hyperbolic potentials V(x)=a2sinh2(x)−ktanh2(x) and V(x)=c2sinh4(x)−ktanh2(x). They may become single- or double-well potentials depending on the potential parameters a,c and k. We find that its exact solutions can be written as the confluent Heun functions Hc(α,β,γ,δ,η;z), in which the energy level E is involved inside the parameter η. The properties of the wave functions, which is strongly relevant f...

**Source: **Physics Letters A - October 30, 2018 **Category: **Physics **Source Type: **research

**Simulating pedestrian flow through narrow exits**

Publication date: Available online 29 October 2018Source: Physics Letters AAuthor(s): Milad Haghani, Majid SarviAbstractIntroduction: The flow of pedestrians through narrow doorways is one of the most common features of crowd motions and evacuations. It is particularly an important aspect of pedestrian simulations models since their accuracy depends highly on their ability to produce realistic exit flow rates. The problem has been extensively studied in the literature, but many aspects of it have remained controversial with mixed (and often contradictory) evidence emerging from different studies and different methods.Metho...

**Source: **Physics Letters A - October 30, 2018 **Category: **Physics **Source Type: **research

**Tunable rectification and negative differential resistance induced by asymmetric doping in phosphorene nanoribbon**

Publication date: Available online 29 October 2018Source: Physics Letters AAuthor(s): Somayeh FotoohiAbstractBy using first-principles calculations based on density functional theory and non-equilibrium Green's function, we present the electronic transport properties of two kinds of devices based on armchair phosphorene nanoribbons, namely, A device, and B device. In A device, the phosphorus atoms in the center of armchair phosphorene nanoribbon have been replaced by impurity atoms of the S and Si, whereas in the B device, the impurity atoms are at the edge of ribbon. The results show that the current–voltage charact...

**Source: **Physics Letters A - October 30, 2018 **Category: **Physics **Source Type: **research

**Modular-value-based metrology with spin coherent pointers**

Publication date: Available online 29 October 2018Source: Physics Letters AAuthor(s): Le Bin Ho, Yasushi KondoAbstractWe discuss an optimal modular-value-based measurement with a spin coherent pointer: A quantum system is exposed to a field whose strength is to be estimated through its modular value. We evaluate the quantum Fisher information as a figure of merit. We found that the modular-value-based measurement can reach the same ultimate precision limit of the estimation as those of measurements without postselections. The quantum Fisher information can be increased when the dimension of the pointer state increases. We ...

**Source: **Physics Letters A - October 30, 2018 **Category: **Physics **Source Type: **research

**Editors**

Publication date: 5 January 2019Source: Physics Letters A, Volume 383, Issue 1Author(s): (Source: Physics Letters A)

**Source: **Physics Letters A - October 30, 2018 **Category: **Physics **Source Type: **research

**Thermalization of electron–positron plasma with quantum degeneracy**

Publication date: Available online 25 October 2018Source: Physics Letters AAuthor(s): M.A. Prakapenia, I.A. Siutsou, G.V. VereshchaginAbstractThe non-equilibrium electron–positron–photon plasma thermalization process is studied using relativistic Boltzmann solver, taking into account quantum corrections both in non-relativistic and relativistic cases. Collision integrals are computed from exact QED matrix elements for all binary and triple interactions in the plasma. It is shown that in non-relativistic case (temperatures kBT≤0.3mec2) binary interaction rates dominate over triple ones, resulting in establish...

**Source: **Physics Letters A - October 27, 2018 **Category: **Physics **Source Type: **research

**Exploration the p-type doping mechanism of GaAs nanowires from first-principles study**

Publication date: Available online 26 October 2018Source: Physics Letters AAuthor(s): Yu Diao, Lei Liu, Sihao XiaAbstractUsing first-principle calculations, we present a systematic investigation upon the influence of p-type doping on the structural and electronic properties of H-passivated GaAs nanowires with wurtzite structure. The GaAs nanowire models of different doping types, different doping elements, different doping positions and different doping concentrations are established. The calculated formation energies show that Zn element becomes more competitive or even slightly favored in realizing p-type doping compared...

**Source: **Physics Letters A - October 27, 2018 **Category: **Physics **Source Type: **research

**Effects of mass transfer on MHD second grade fluid towards stretching cylinder: A novel perspective of Cattaneo-Christov heat flux model**

This study can be used an application of central heating system and to measure the fast chemical reactions rates. (Source: Physics Letters A)

**Source: **Physics Letters A - October 27, 2018 **Category: **Physics **Source Type: **research

**Ab initio and Monte Carlo studies of phase transitions and magnetic properties of YCrO3: Heisenberg model**

Publication date: Available online 26 October 2018Source: Physics Letters AAuthor(s): S. Sidi Ahmed, G. Dimitri Ngantso, M. Boujnah, A. Benyoussef, A. El KenzAbstractBy using the density functional theory (DFT) and Monte Carlo simulations (MCS) with the Heisenberg model, we have studied magnetic properties of the bulk perovskite YCrO3. The exchange couplings of the Heisenberg model and the magnetic anisotropy are investigated. The 110 direction in the crystalline structure of the compound has shown the minimum energy, it is the easy magnetic direction. Using Monte Carlo simulations, the magnetizations behavior, the effects...

**Source: **Physics Letters A - October 27, 2018 **Category: **Physics **Source Type: **research

**Picturing quantum phase transitions**

Publication date: Available online 26 October 2018Source: Physics Letters AAuthor(s): C. Muñoz, M. Gaeta, R. Gomez, A.B. KlimovAbstractWe discuss the quantum phase transitions (QPT) in N-spin chains from the point of view of collective observables. We show that the measurement space representation is a convenient tool for the analysis of phase transitions, allowing the determination of an appropriate set of macroscopic order parameters (for a given Hamiltonian). Quantum correlations in the vicinity of the critical points are analyzed both in the ground states and low temperature thermal states. (Source: Physics Letters A)

**Source: **Physics Letters A - October 27, 2018 **Category: **Physics **Source Type: **research

**Crossover effects and finite-size scaling on the temperature dependence of paraconductivity in YBa2Cu3O6.9 and Bi2Sr2CaCu30x compounds**

Publication date: Available online 25 October 2018Source: Physics Letters AAuthor(s): A.V. Wirngo, R.M. Keumo Tsiaze, S.C. Kenfack, E. BaloïtchaAbstractAn investigation into the superconducting order parameter thermodynamic fluctuations and their manifestations on paraconductivity in cuprate superconductors is done using a renormalized Gaussian approach based on the Ginzburg–Landau theory. The temperature dependence of paraconductivity is affected by repulsive interactions between Cooper pairs and does not follow the universal power laws predicted by the conventional Aslamazov–Larkin theory. In addition to...

**Source: **Physics Letters A - October 26, 2018 **Category: **Physics **Source Type: **research

**Thermalization of electron-positron plasma with quantum degeneracy**

Publication date: Available online 25 October 2018Source: Physics Letters AAuthor(s): M.A. Prakapenia, I.A. Siutsou, G.V. VereshchaginAbstractThe non-equilibrium electron-positron-photon plasma thermalization process is studied using relativistic Boltzmann solver, taking into account quantum corrections both in non-relativistic and relativistic cases. Collision integrals are computed from exact QED matrix elements for all binary and triple interactions in the plasma. It is shown that in non-relativistic case (temperatures kBT≤0.3mec2) binary interaction rates dominate over triple ones, resulting in establishment of the ...

**Source: **Physics Letters A - October 26, 2018 **Category: **Physics **Source Type: **research

**Effects of carbon doping and vacancy defect on the magnetism of anatase TiO2**

In this study, the effects of C doping and vacancy defect on the magnetism of TiO2 were investigated by generalized gradient approximation and Hubbard U method based on density functional theory. Systems with coexisting interstitial C and O vacancies achieved half-metallic ferromagnetism, and the Curie temperature was above the room temperature. The system used as electron injection source reached 100% electron spin polarization. The Ti32CO2O62c system exhibited ferromagnetism, and the Curie temperature was above the room temperature. The magnetism source of Ti16CiOa31 and Ti32CO2Oc62 demonstrated strong hybrid coupling el...

**Source: **Physics Letters A - October 26, 2018 **Category: **Physics **Source Type: **research

**High thermoelectric performance of one graphene nanoribbon with line defects**

Publication date: Available online 25 October 2018Source: Physics Letters AAuthor(s): Wen-Lai Mu, Hai-Na Wu, Yu Han, Wei-Jiang GongAbstractWe investigate the quantum transport through zigzag graphene nanoribbons with embedded “5-7-5”-edge line defects, by means of the non-equilibrium Green's function technique. It is found that when two semi-infinite line defects exist in the nanoribbon, notable Fano antiresonance takes place in the quantum transport process, which enables to drive the apparent thermoelectric effect. We propose this structure to be a promising candidate for improving the thermoelectric efficien...

**Source: **Physics Letters A - October 26, 2018 **Category: **Physics **Source Type: **research

**Tunneling-induced ultraslow solitons in triangular quantum dot molecules**

Publication date: Available online 25 October 2018Source: Physics Letters AAuthor(s): Dong Sun, Hongjun Zhang, Hui Sun, Xiaowei Li, Gaiying WangAbstractWe theoretically investigate the propagation of a weak probe laser pulse in a triangular quantum dot molecules scheme based on the tunneling induced transparency. We find that the ultraslow optical solitons can be realized due to the destructive quantum interference induced by the interdot tunneling coupling which can be adjusted by the gate voltage appropriately. This work may provide practical applications such as electro-optic modulated devices and other information proc...

**Source: **Physics Letters A - October 26, 2018 **Category: **Physics **Source Type: **research

**Dynamics of Bose–Einstein condensate in driven tilted optical lattices**

Publication date: Available online 25 October 2018Source: Physics Letters AAuthor(s): Ai-Xia Zhang, Li-Xia Cai, Zi-Fa Yu, Na-Na Chang, Si-Qi He, Ju-Kui XueAbstractWe study the dynamics of Bose–Einstein condensate in one-dimensional driven tilted periodic optical lattices by using variational approximation and numerical simulation. Rich phenomena are revealed, including diffusion, self-trapping, breather and soliton, which strongly depend on the atomic interaction, the amplitude of the modulation, the constant force and the phase difference between the Bloch oscillations and the drive. The critical conditions for the ...

**Source: **Physics Letters A - October 26, 2018 **Category: **Physics **Source Type: **research

**Quantum criticality of quantum speed limit for a two-qubit system in the spin chain with the Dzyaloshinsky-Moriya interaction**

Publication date: Available online 25 October 2018Source: Physics Letters AAuthor(s): Shaoying Yin, Jie Song, Shutian LiuAbstractWe study the quantum speed limit (QSL) time of a two-qubit system coupled to a spin-chain model with the Dzyaloshinsky-Moriya (DM) interaction. For the Bell state coupled to the Ising model or anisotropic XY model, we find that there is a prominent corresponding relationship between the QSL time and quantum phase transition in a spin-chain environment with larger scale, and the DM interaction can strongly enhance or suppress the response relation. Remarkably, when the surrounding environment is s...

**Source: **Physics Letters A - October 26, 2018 **Category: **Physics **Source Type: **research

**Analytical prediction of multiple solutions for MHD Jeffery–Hamel flow and heat transfer utilizing KKL nanofluid model**

Publication date: Available online 23 October 2018Source: Physics Letters AAuthor(s): Puneet Rana, Nisha Shukla, Yogesh Gupta, Ioan PopAbstractIn this framework, the novel analytical approach is presented to predict the dual solutions of Jeffery–Hamel (JH) transport model utilizing KKL (Koo–Kleinstreuer–Li) Al2O3 model with magnetic field, Ohmic heating and viscous dissipation. The predictor homotopy analysis method (PHAM) is applied to realize the existence of multiple solutions (bifurcation) for stretching/shrinking parameter and channel angle. It is observed that the dual solutions exist only for conve...

**Source: **Physics Letters A - October 24, 2018 **Category: **Physics **Source Type: **research

**Wada boundary bifurcations induced by boundary saddle–saddle collision**

Publication date: Available online 23 October 2018Source: Physics Letters AAuthor(s): Xiao-Ming Liu, Jun Jiang, Ling Hong, Dafeng TangAbstractIn this letter, a Wada boundary bifurcation (WBB) induced by a boundary saddle touching another boundary saddle is first found through the study of a forced damped pendulum. The WBB can be quantitatively described by the change both in the number of basins involved and in the geometrical size of the boundary. We perceive the manifold structures of the two saddles, that is, a pre-existence of heteroclinic crossing and the other nearly forming heteroclinic tangency exist before the WBB...

**Source: **Physics Letters A - October 24, 2018 **Category: **Physics **Source Type: **research

**Boson–boson pure-dephasing model with non-Markovian properties**

Publication date: Available online 23 October 2018Source: Physics Letters AAuthor(s): Fei-Lei Xiong, Li Li, Zeng-Bing ChenAbstractIn this paper, we discuss the mechanism of pure-dephasing process with a newly proposed boson–boson model, namely, a bosonic field coupled to another bosonic bath in thermal equilibrium. Our model is fully solvable and can reproduce the pure-dephasing process which is usually described by the well-known spin–boson model, therefore offering a new perspective to understanding decoherence processes in open quantum systems of high dimension. We also show that this model admits a generica...

**Source: **Physics Letters A - October 24, 2018 **Category: **Physics **Source Type: **research

**Morse parameters for the interaction of metals with graphene and silicene**

We present Morse parameters for the interaction of graphene and silicene surfaces with the atoms of practically important metals Ni, Ag, and Li. The parameters' values are derived from the dispersion corrected density functional calculations. Two possible cases of sp2-hybridized C/Si atoms in the unbroken graphene/silicene sheets and sp-hybridized atoms near the vacancies are considered. Proposed Morse parameters' sets reproduce binding energies, bond lengths and oscillation frequencies of metal atoms adsorbed on the hollow positions over the rings of C60 and Si60 fullerenes. They also reproduce well the same quantities fo...

**Source: **Physics Letters A - October 24, 2018 **Category: **Physics **Source Type: **research

**Editors**

Publication date: 5 December 2018Source: Physics Letters A, Volume 382, Issue 48Author(s): (Source: Physics Letters A)

**Source: **Physics Letters A - October 24, 2018 **Category: **Physics **Source Type: **research

**Lump waves, solitary waves and interaction phenomena to the (2 + 1)-dimensional Konopelchenko–Dubrovsky equation**

Publication date: Available online 22 October 2018Source: Physics Letters AAuthor(s): Wenhao Liu, Yufeng Zhang, Dandan ShiAbstractIn this paper, we investigated the (2+1)-dimensional Konopelchenko–Dubrovsky equation. The lump waves, solitary waves as well as interaction between lump waves and solitary waves are presented based on the Hirota bilinear form of this equation. It is worth noting that the rational solutions are obtained by taking a long wave limit, and we also discussed the lump solutions and rogue wave solutions. Moreover, all these solutions are presented via 3-dimensional plots and density plots with ch...

**Source: **Physics Letters A - October 24, 2018 **Category: **Physics **Source Type: **research

**Classical breathers and quantum coherent states in discrete NLS systems**

We present a comparison of quantum and “semiclassical” trajectories of coherent states that correspond to classical breather solutions of finite discrete nonlinear Schrödinger (DNLS) lattices. The main goal is to explain earlier numerical observations of recurrent return to the vicinity of initial coherent states corresponding to stable breathers that are also spatially localized. This effect can be considered as a quantum manifestation of classical spatial localization. We show that these phenomena are encoded in a simple expression for the distance between the quantum and semiclassical states that involv...

**Source: **Physics Letters A - October 24, 2018 **Category: **Physics **Source Type: **research

**The anisotropic effect of hexagonal warping on the transport**

Publication date: Available online 22 October 2018Source: Physics Letters AAuthor(s): Mei-Mei Wu, Zhi-Ming Yu, Hui PanAbstractIn the presence of hexagonal warping (HW), the surface state of a topological insulator (TI) exhibits anisotropic Fermi surface. In this work, we study the transport properties of a TI junction, focusing on the influence of anisotropic effect of the HW on the scattering. We establish general expressions for calculating the scattering with an arbitrary angle between TI surface and the potential step, and find that the transmission probability and conductance have a strong dependence on the angle, mak...

**Source: **Physics Letters A - October 24, 2018 **Category: **Physics **Source Type: **research

**Pseudo topological insulators**

Publication date: Available online 22 October 2018Source: Physics Letters AAuthor(s): C. YuceAbstractWe predict pseudo topological insulators that have been previously overlooked. We determine some conditions under which robust pseudo topological edge states appear and illustrate our idea on the Su–Schrieffer–Heeger (SSH) model with extra chiral symmetry breaking potentials. We discuss that pseudo topological insulating phase transition occurs without band gap closing. (Source: Physics Letters A)

**Source: **Physics Letters A - October 24, 2018 **Category: **Physics **Source Type: **research

**Effect of interface structure on deformation behavior of crystalline Cu/amorphous CuZr sandwich structures**

Publication date: Available online 22 October 2018Source: Physics Letters AAuthor(s): H.Y. Song, J.J. Xu, Q. Deng, Y.L. LiAbstractThe effect of interface types (namely, sharp interface and graded interface) and its thickness on the deformation behavior of crystalline/amorphous/crystalline sandwich structures (CACSSs) under tensile loading are studied using molecular dynamics simulation. Compared with the CACSSs with sharp interface, the CACSSs with gradient interface consistently exhibit good plasticity when the interface thickness is larger than 6 nm, due to the coupling effects among crystalline layer, amorphous layer an...

**Source: **Physics Letters A - October 24, 2018 **Category: **Physics **Source Type: **research

**The effect of anti-site disorder and tetragonal distortion on the electronic structure of Ti2VSb**

Publication date: Available online 23 October 2018Source: Physics Letters AAuthor(s): A. Feng, X.Y. ZhangAbstractThe theoretical study published on J. Magn. Magn. Mater. 449 (2018) 515 has predicted that Hg2CuTi-type Ti2VSb is a fully compensated ferrimagnetic semiconductor. In this work, the effect of the anti-site disorder and the tetragonal distortion on the electronic structure of Ti2VSb has been investigated using first-principles calculations. The calculated results indicate that the fully compensated ferrimagnetic semiconductor (FCFS) property of Ti2VSb is sensitive to the tetragonal distortion and FCFS property can...

**Source: **Physics Letters A - October 24, 2018 **Category: **Physics **Source Type: **research

**Exotic vortex structures of the dipolar Bose–Einstein condensates trapped in harmonic-like and toroidal potential**

Publication date: Available online 18 October 2018Source: Physics Letters AAuthor(s): Rui-Fang Zhang, Xiao-Fei Zhang, Lu LiAbstractBased on the tunable intensity and waist of Gaussian laser, harmonic-like and toroidal potentials can be achieved and the ground-state properties of the dipolar Bose–Einstein condensate (BEC) trapped in such potentials are investigated. It is found that, in the harmonic-like potential, the singly and doubly quantized vortices can exist in the scale condensate and translate respectively into vortex pairs and triangular vortex lattice with increasing dipole–dipole interaction (DDI). E...

**Source: **Physics Letters A - October 20, 2018 **Category: **Physics **Source Type: **research

**Massless and quantized modes of kinks in the phase space of superconducting gaps**

Publication date: Available online 19 October 2018Source: Physics Letters AAuthor(s): Takashi Yanagisawa, Izumi Hase, Yasumoto TanakaAbstractWe investigated quantized modes of kinks in the phase space of superconducting gaps in a superconductor with multiple gaps. The kink is described by the sine-Gordon model in a two-gap superconductor and by the double sine-Gordon model in a three-gap superconductor. A fractional-flux vortex exists at the edge of the kink, and a fractional-flux vortex will be stable in a three-gap superconductor with time-reversal symmetry breaking. The kink and fractional-flux vortex exhibit massless m...

**Source: **Physics Letters A - October 20, 2018 **Category: **Physics **Source Type: **research