**The investigation of structural, electronic, elastic and thermodynamic properties of Gd1−xYxAuPb alloys: A first principle study**

Publication date: Available online 19 October 2018Source: Physics Letters AAuthor(s): Parviz Saeidi, Shahram Yalameha, Zahra NourbakhshAbstractFirst principle calculations have been employed to investigate the effects of Y concentration, pressure and temperature on various properties of Gd1−xYxAuPb (x=0,0.25,0.5,0.75,1) alloys using density functional theory (DFT). The full potential linearized augmented plane wave (FP-LAPW) method within a framework of the generalized gradient approximation (GGA) is used to perform the calculated results of this paper. Phase stability of Gd1−xYxAuPb alloys is studied using the...

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

**Temperature control of spin wave propagation over 100 μm distance in 100 nm-thick YIG film**

Publication date: Available online 18 October 2018Source: Physics Letters AAuthor(s): Md Shah Alam, Chuangtang Wang, Jilei Chen, Jianyu Zhang, Chuanpu Liu, Jiang Xiao, Yizheng Wu, Lei Bi, Haiming YuAbstractThe spin wave propagating along a film of 100 nm- thick yttrium iron garnet is studied with temperature control. Using a vector network analyzer, temperature dependence of spin wave transmission is measured. We observe a clear resonance frequency shift of 210 MHz with temperature change of 40 K. This can be explained by the dispersion variation of the temperature. These results enable a complete pass or forbidden spin wa...

**Source: **Physics Letters A - October 19, 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). Especially, t...

**Source: **Physics Letters A - October 19, 2018 **Category: **Physics **Source Type: **research

**On symmetry preserving and symmetry broken bright, dark and antidark soliton solutions of nonlocal nonlinear Schrödinger equation**

We present explicit one and two bright soliton solutions and show that they exhibit stable structures only when we combine the field and parity transformed complex conjugate field. Further, we derive two dark/antidark soliton solution with the help of DT method. Unlike the bright soliton case, dark/antidark soliton solution exhibits stable structure for the field and the parity transformed conjugate field separately. In the dark/antidark soliton solution case we observe a contrasting behaviour between the envelope of the field and parity transformed complex conjugate envelope of the field. For a particular parametric choic...

**Source: **Physics Letters A - October 18, 2018 **Category: **Physics **Source Type: **research

**Oxygen vacancy-assisted high ionic conductivity in perovskite LaCoO3−δ (δ = 1/3) thin film: A first-principles-based study**

Publication date: Available online 17 October 2018Source: Physics Letters AAuthor(s): Hong Wu, Feng LiAbstractSynthesizing a solid state material with high oxygen-ionic conductivity is a challenge. In this work, an integrated method of density functional theory and first-principles molecular dynamics (FPMD) simulations has been performed to investigate the oxygen-ionic conductivity in the LaCoO3−δ films. We demonstrated that, in the strained epitaxial LaCoO3−δ films, O vacancy superstructures release strain and produce the high oxygen-ionic conductivity with an activation barrier of 0.65±0.1 ...

**Source: **Physics Letters A - October 17, 2018 **Category: **Physics **Source Type: **research

**Structural, magnetic, magnetocaloric and impedance spectroscopy analysis of Pr0.8Sr0.2MnO3 manganite prepared by modified solid-state route**

Publication date: Available online 15 October 2018Source: Physics Letters AAuthor(s): A. Ben Jazia Kharrat, K. Khirouni, W. BoujelbenAbstractOrthorhombic Pr0.8Sr0.2MnO3 sample is prepared by solid-state reaction method and quenched in water. The occurrence of a second-order phase transition is confirmed by Arrott plots. The critical exponents determined using different models are in good agreement with the 3D-Ising model. The magnetocaloric results have shown an important maximum of the magnetic entropy change and relative cooling power evaluated at 2.14 J kg−1 K−1 and 101.52 J kg−1 u...

**Source: **Physics Letters A - October 16, 2018 **Category: **Physics **Source Type: **research

**Editors**

Publication date: 30 November 2018Source: Physics Letters A, Volume 382, Issue 47Author(s): (Source: Physics Letters A)

**Source: **Physics Letters A - October 16, 2018 **Category: **Physics **Source Type: **research

**Stability and coherence of strong-coupling magneto-bipolaron in asymmetric quantum dot under laser field effect**

This study enables to construct superconducting materials. (Source: Physics Letters A)

**Source: **Physics Letters A - October 15, 2018 **Category: **Physics **Source Type: **research

**Critical and multicritical behavior in the Ising–Heisenberg universality class**

Publication date: Available online 12 October 2018Source: Physics Letters AAuthor(s): A.O. SorokinAbstractCritical behavior of three-dimensional classical frustrated antiferromagnets with a collinear spin ordering and with an additional twofold degeneracy of the ground state is studied. We consider two lattice models, whose continuous limit describes a single phase transition with a symmetry class differing from the class of non-frustrated magnets as well as from the classes of magnets with non-collinear spin ordering. A symmetry breaking is described by a pair of independent order parameters, which are similar to order pa...

**Source: **Physics Letters A - October 15, 2018 **Category: **Physics **Source Type: **research

**Ultracold Rydberg Atoms for Efficient Storage of Terahertz Frequency Signals using Electromagnetically Induced Transparency**

Publication date: Available online 11 October 2018Source: Physics Letters AAuthor(s): Sumit Bhushan, Vikas S. Chauhan, Raghavan K. EaswaranAbstractQuantum communication with terahertz (THz) frequency signals has many advantages like reduced attenuation and scintillation effects in certain atmospheric conditions along with very high level of data security. In this work, we propose a scheme to realize Quantum Memory (QM) for efficient storage of terahertz (THz) frequency signals using Electromagnetically Induced Transparency (EIT) in an ultracold atomic medium of 87Rb Rydberg atoms prepared in a Two Dimensional Magneto Optic...

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

**A theoretical prediction of rotating waves in Type-I hydraulic jumps**

Publication date: Available online 9 October 2018Source: Physics Letters AAuthor(s): Arnab K. Ray, Niladri Sarkar, Abhik Basu, Jayanta K. BhattacharjeeAbstractThe rotation of polygons in a Type-II hydraulic jump prompts us to look for a rotational feature in the Type-I hydraulic jump. Coupling the radial and azimuthal flows breaks the azimuthal symmetry of the shallow-water circular jump. An unstable rotating wave along the circumference of the jump is possible with a kinematic viscosity of very small order, whose upper threshold value is less than the kinematic viscosity of water. (Source: Physics Letters A)

**Source: **Physics Letters A - October 10, 2018 **Category: **Physics **Source Type: **research

**Extreme Narrow Escape: shortest paths for the first particles among n to reach a target window**

Publication date: Available online 10 October 2018Source: Physics Letters AAuthor(s): K. Basnayake, A. Hubl, Z. Schuss, D. HolcmanAbstractWhat are the paths associated with the fastest Brownian particles that reach a narrow window located on the boundary of a microdomain? Although the distribution of the fastest arrival times has been well studied in dimension 1, much less is known in higher dimensions. Based on the Wiener path-integral, we suggest that the paths of the fastest particle are concentrated near the shortest paths that minimize the energy-action. Stochastic simulations confirm the present result when an obstac...

**Source: **Physics Letters A - October 10, 2018 **Category: **Physics **Source Type: **research

**Editors**

Publication date: 23 November 2018Source: Physics Letters A, Volume 382, Issue 46Author(s): (Source: Physics Letters A)

**Source: **Physics Letters A - October 10, 2018 **Category: **Physics **Source Type: **research

**Stability of symmetry breaking states in finite-size Dicke model with photon leakage**

Publication date: 23 November 2018Source: Physics Letters A, Volume 382, Issue 46Author(s): R. Imai, Y. YamanakaAbstractWe investigate the finite-size Dicke model with photon leakage. It is shown that the symmetry breaking states, which are characterized by non-vanishing 〈aˆ〉≠0 and correspond to the ground states in the superradiant phase in the thermodynamic limit, are stable, while the eigenstates of the isolated finite-size Dicke Hamiltonian conserve parity symmetry. We introduce and analyze an effective master equation that describes the dynamics of a pair of the symmetry breaking states that are the degene...

**Source: **Physics Letters A - October 10, 2018 **Category: **Physics **Source Type: **research

**On subgame perfect equilibria in quantum Stackelberg duopoly with incomplete information**

Publication date: Available online 6 October 2018Source: Physics Letters AAuthor(s): Piotr Fra̧ckiewiczAbstractThe Li–Du–Massar quantum duopoly model is one of the generally accepted quantum game schemes. It has applications in a wide range of duopoly problems. Our purpose is to study Stackelberg's duopoly with incomplete information in the quantum domain. The result of Lo and Kiang has shown that the correlation of players' quantities caused by the quantum entanglement enhances the first-mover advantage in the game. Our work demonstrates that there is no first-mover advantage if the players' actions are maxim...

**Source: **Physics Letters A - October 9, 2018 **Category: **Physics **Source Type: **research

**Correlation between Hydrogen/Deuterium Exchange and Amide I Band Intensity in Hemoglobin Aqueous Solution under Static or 50 Hz Magnetic Field**

Publication date: Available online 9 October 2018Source: Physics Letters AAuthor(s): Emanuele Calabrò, Salvatore MagazùAbstractSamples of hemoglobin in deuterium oxide solution (D2O) and in bidistilled H2O water solution, both at the concentration of 100 mg/ml, were exposed to a static magnetic field at 100 mT; analogue samples were exposed to 50 Hz magnetic field at 1 mT. Fourier Transform Infrared (FTIR) Spectroscopy was used to analyze separately the response of the secondary structure of this protein (diluted in both aqueous solutions) to separated exposure to both magnetic fields. The most relevant resul...

**Source: **Physics Letters A - October 9, 2018 **Category: **Physics **Source Type: **research

**Generalized squeezed states**

Publication date: Available online 5 October 2018Source: Physics Letters AAuthor(s): Kevin Zelaya, Sanjib Dey, Véronique HussinAbstractSqueezed states are one of the most useful quantum optical models having various applications in different areas, especially in quantum information processing. Generalized squeezed states are even more interesting since, sometimes, they provide additional degrees of freedom in the system. However, they are very difficult to construct and, therefore, people explore such states for individual setting and, thus, a generic analytical expression for generalized squeezed states is yet inad...

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

**On subgame perfect equilibria in quantum Stackelberg duopoly with incompete information**

Publication date: Available online 6 October 2018Source: Physics Letters AAuthor(s): Piotr Fra̧ckiewiczAbstractThe Li-Du-Massar quantum duopoly model is one of the generally accepted quantum game schemes. It has applications in a wide range of duopoly problems. Our purpose is to study Stackelberg's duopoly with incomplete information in the quantum domain. The result of Lo and Kiang has shown that the correlation of players' quantities caused by the quantum entanglement enhances the first-mover advantage in the game. Our work demonstrates that there is no first-mover advantage if the players' actions are maximally correla...

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

**Scaling invariance in a social network with limited attention and innovation**

We describe the behavior of the diversity of information in a social network as a function of time by using scaling arguments and we demonstrate its scaling invariant with respect of time as well as information load, attention and network sizes. Scaling transformations are used to overlap different curves of diversity, obtained by distinct parameters, onto an universal plot. (Source: Physics Letters A)

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

**Benefits of intervention in spatial public goods games**

Publication date: Available online 4 October 2018Source: Physics Letters AAuthor(s): Luhe Yang, Zhaojin Xu, Lianzhong Zhang, Duoxing YangAbstractThe anarchy driven by private punishment is inopportune and inappropriate in modern human societies. It is necessary for a person to appeal to a higher authority such as the police so that a society can maintain more stable. We introduce strategy intervention instead of punishment in spatial public goods game. Some defectors are forced to contribute to the common pool. We show how strategy intervention affects cooperation of a population. Interestingly, weak intervention restrains...

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

**Electronic vacuum charge for an overcritical nucleus**

Publication date: Available online 21 September 2018Source: Physics Letters AAuthor(s): Sergey F. Garanin, Ekaterina M. KravetsAbstractA “cut-off” Coulomb potential taking into account the finite size of the nucleus is finite, and a solution of the Dirac equation can be constructed for any energy, both positive and negative. In the paper we develop an exact solution of the Dirac equation for a fixed value of the total momentum j for the whole spectrum of energies, which allows us to determine the vacuum charge and its spatial distribution. We consider nuclei with different charges Z, both ZZc, where Z=Zc is the...

**Source: **Physics Letters A - October 5, 2018 **Category: **Physics **Source Type: **research

**Analysis of drivers' characteristics on continuum model with traffic jerk effect**

Publication date: Available online 25 September 2018Source: Physics Letters AAuthor(s): Zhai Cong, Wu WeitiaoAbstractIn this paper we propose an enhanced continuum model for traffic flow considering the effect of driver characteristics and traffic jerk. Based on the linear stability condition, the sufficient conditions of model stability is given. In the nonlinear stability analysis, we derive the KdV–Burger equation to describe the propagation characteristics of traffic density waves near the neutral stability curve. The simulation example verified that the driver characteristics and traffic jerk have a significant ...

**Source: **Physics Letters A - October 5, 2018 **Category: **Physics **Source Type: **research

**Exact density matrix of an oscillator-bath system: Alternative derivation**

Publication date: Available online 25 September 2018Source: Physics Letters AAuthor(s): Fardin KheirandishAbstractStarting from a total Lagrangian describing an oscillator-bath system, an alternative derivation of exact quantum propagator is presented. Having the quantum propagator, the exact density matrix, reduced density matrix of the main oscillator and thermal equilibrium fixed point are obtained. The modified quantum propagator is obtained in the generalised case where the main oscillator is under the influence of a classical external force. By introducing auxiliary classical external fields, the generalised quantum ...

**Source: **Physics Letters A - October 5, 2018 **Category: **Physics **Source Type: **research

**Moment of inertia of superconductors**

Publication date: Available online 25 September 2018Source: Physics Letters AAuthor(s): J.E. HirschAbstractWe find that the bulk moment of inertia per unit volume of a metal becoming superconducting increases by the amount me/(πrc), with me the bare electron mass and rc=e2/mec2 the classical electron radius. This is because superfluid electrons acquire an intrinsic moment of inertia me(2λL)2, with λL the London penetration depth. As a consequence, we predict that when a rotating long cylinder becomes superconducting its angular velocity does not change, contrary to the prediction of conventional BCS-London...

**Source: **Physics Letters A - October 5, 2018 **Category: **Physics **Source Type: **research

**Influences of strains on the formation of the quasi-Dirac cone and the Landau levels in black phosphorus**

Publication date: Available online 26 September 2018Source: Physics Letters AAuthor(s): Zhaotan Jiang, Zengtao LvAbstractA tunable tight-binding (TB) Hamiltonian, which can be tuned continuously by applying the strains, is proposed based on the two tight-binding Hamiltonian models used to describle the pristine and compressed black phosphorus (BP). This tunable TB Hamiltonian should be of fundamental significance in two aspects: i) A general tunable TB Hamiltonian making it possible to study the BP more conveniently and deeply; ii) An extension of the study of the strain effect from the monolayer phosphorene to the multila...

**Source: **Physics Letters A - October 5, 2018 **Category: **Physics **Source Type: **research

**The first principle study of the electronic structure of SixGe(1−x) alloy films**

Publication date: Available online 1 October 2018Source: Physics Letters AAuthor(s): Xue-ke Wu, Wen-jing Chen, You-sheng Yu, Yan-lin TangAbstractFirst principles calculation based on density functional theory (DFT) with the generalized gradient approximation (GGA) are carried out to investigate the electronic band structures of SixGe(1−x) alloys nanofilms. The calculation results show that the band gaps of (100), (110) and (111) surfaces SixGe(1−x) alloy films with different thickness first increase with the increase of Si content, then flatten out, and finally decrease. At the same time, the transformation of ...

**Source: **Physics Letters A - October 5, 2018 **Category: **Physics **Source Type: **research

**Ultra-intense femtosecond super-heavy ion beams driven by a multi-PW laser**

Publication date: Available online 1 October 2018Source: Physics Letters AAuthor(s): Jarosław Domański, Jan BadziakAbstractThe paper reports the results of numerical studies on the laser-driven acceleration of super-heavy ions by a multi-PW laser pulse of ultra-relativistic intensity attainable with the Extreme Light Infrastructure lasers currently being built in Europe. Using a multi-dimensional (2D3V) particle-in-cell code, it is shown that multi-GeV super-heavy (thorium) ion beams with an intensity of ∼1021–1022W/cm2, fluence ∼1017–1018cm−2 and time duration ∼20–100fs can be produce...

**Source: **Physics Letters A - October 5, 2018 **Category: **Physics **Source Type: **research

**Study of EIT resonances in an anti-relaxation coated Rb vapor cell**

Publication date: Available online 1 October 2018Source: Physics Letters AAuthor(s): Mangesh Bhattarai, Vineet Bharti, Vasant Natarajan, Armen Sargsyan, David SarkisyanAbstractWe study the sign of resonances obtained in electromagnetically induced transparency (EIT). Resonances of both kinds—bright (corresponding to enhanced absorption) and dark (corresponding to reduced absorption)—are obtained when the frequency of a probe beam is scanned. The experimental results, presented earlier, use magnetic sublevels of a hyperfine transition in the D1 line of 87Rb along with a magnetic field of 27 G. The atoms are cont...

**Source: **Physics Letters A - October 5, 2018 **Category: **Physics **Source Type: **research

**Six-dimensional heavenly equation. Dressing scheme and the hierarchy**

Publication date: Available online 2 October 2018Source: Physics Letters AAuthor(s): L.V. Bogdanov, M.V. PavlovAbstractWe consider six-dimensional heavenly equation as a reduction in the framework of general six-dimensional linearly degenerate dispersionless hierarchy. We characterise the reduction in terms of wave functions, introduce generating relation, Lax–Sato equations and develop the dressing scheme for the reduced hierarchy. Using the dressing scheme, we construct a class of solutions for six-dimensional heavenly equation in terms of implicit functions. (Source: Physics Letters A)

**Source: **Physics Letters A - October 5, 2018 **Category: **Physics **Source Type: **research

**System of interacting harmonic oscillators in rotationally invariant noncommutative phase space**

Publication date: Available online 2 October 2018Source: Physics Letters AAuthor(s): Kh.P. GnatenkoAbstractRotationally invariant space with noncommutativity of coordinates and noncommutativity of momenta of canonical type is considered. A system of N interacting harmonic oscillators in uniform field and a system of N particles with harmonic oscillator interaction are studied. We analyze effect of noncommutativity on the energy levels of these systems. It is found that influence of coordinates noncommutativity on the energy levels of the systems increases with increasing of the number of particles. The spectrum of N free p...

**Source: **Physics Letters A - October 5, 2018 **Category: **Physics **Source Type: **research

**Nonlocality and local causality in the Schrödinger equation with time-dependent boundary conditions**

Publication date: Available online 2 October 2018Source: Physics Letters AAuthor(s): A. Matzkin, S.V. Mousavi, M. WaegellAbstractWe investigate the nonlocal dynamics of a single particle placed in an infinite well with moving walls. It is shown that in this situation, the Schrödinger equation (SE) violates local causality by causing instantaneous changes in the probability current everywhere inside the well. This violation is formalized by designing a gedanken faster-than-light communication device which uses an ensemble of long narrow cavities and weak measurements to resolve the weak value of the momentum far away f...

**Source: **Physics Letters A - October 5, 2018 **Category: **Physics **Source Type: **research

**Spin-polarized transport induced by photoirradiation in zigzag silicene nanosystem**

Publication date: Available online 3 October 2018Source: Physics Letters AAuthor(s): Yun-Lei Sun, Xing-Bo Wang, En-Jia YeAbstractWe study the spin-polarized transport induced by photoirradiation in zigzag silicene nanosystem, based on tight-binding approach, Green's function method and Landauer–Büttiker formula. By applying strong circular polarized light, silicene nanosystem can be transformed into a quantum Hall insulator, where the spin-down subband is gapped while the spin-up subband persists gapless edge state. Therefore, the dc conductance is dominated by the spin-up electrons, and the spin polarization ca...

**Source: **Physics Letters A - October 5, 2018 **Category: **Physics **Source Type: **research

**Domain wall nucleation and propagation in spin-transfer torque switching with thermal effects**

Publication date: Available online 3 October 2018Source: Physics Letters AAuthor(s): Bingjin Chen, Tiejun Zhou, Siang Yee Sim, Sze Ter Lim, Hao GongAbstractWe conduct micro-magnetic simulations to study spin-transfer torque induced magnetization switching in perpendicular magnetic tunneling junctions. The effects of current densities and temperatures on the switching processes are studied in details. We then proposed an approach to compute the deterministic switching time by taking thermal-effect into account. The switching time is less temperature-dependent under higher current density; however, as the current density dec...

**Source: **Physics Letters A - October 5, 2018 **Category: **Physics **Source Type: **research

**Multiple internal resonances in MEMS arch resonators**

Publication date: Available online 3 October 2018Source: Physics Letters AAuthor(s): A.Z. Hajjaj, N. Jaber, M.A.A. Hafiz, S. Ilyas, M.I. YounisAbstractMicromachined shallow arch resonant beams have attracted significant attention thanks to their rich dynamical behavior, inherent nonlinearities, and the potential to excite various internal resonances. Currently, there is a lack of comprehensive experimental studies for the various types of internal resonances in arches and particularly at the micro and nano scales. Here, we aim to investigate and identify different types of internal resonances of an initially curved beam, e...

**Source: **Physics Letters A - October 5, 2018 **Category: **Physics **Source Type: **research

**Editors**

Publication date: 9 November 2018Source: Physics Letters A, Volume 382, Issue 44Author(s): (Source: Physics Letters A)

**Source: **Physics Letters A - October 5, 2018 **Category: **Physics **Source Type: **research

**Editors**

Publication date: 16 November 2018Source: Physics Letters A, Volume 382, Issue 45Author(s): (Source: Physics Letters A)

**Source: **Physics Letters A - October 5, 2018 **Category: **Physics **Source Type: **research

**A denial-of-service attack on fiber-based continuous-variable quantum key distribution**

Publication date: 16 November 2018Source: Physics Letters A, Volume 382, Issue 45Author(s): Yuan Li, Peng Huang, Shiyu Wang, Tao Wang, Dengwen Li, Guihua ZengAbstractIn a fiber-based continuous-variable quantum key distribution (CVQKD) system, to perform the channel estimation, the channel transmittance is usually assumed to be a constant. Subsequently, when the channel parameters are intentionally manipulated, the employed parameter estimation method will lead to deviations of channel parameters and ultimately impacting the evaluation of the secret key rate. In this paper, we propose a denial-of-service attack strategy ba...

**Source: **Physics Letters A - October 5, 2018 **Category: **Physics **Source Type: **research

**Toward a topological scenario for high-temperature superconductivity of copper oxides**

Publication date: 16 November 2018Source: Physics Letters A, Volume 382, Issue 45Author(s): V.A. Khodel, J.W. Clark, M.V. ZverevAbstractThe structure of the joint phase diagram demonstrating high-Tc superconductivity of copper oxides is studied on the basis of the theory of interaction-induced flat bands. Prerequisites for an associated topological rearrangement of the Landau state are established, and related non-Fermi-liquid (NFL) behavior of the normal states of cuprates is investigated. We focus on manifestations of this behavior in the electrical resistivity ρ(T), especially the observed gradual crossover from nor...

**Source: **Physics Letters A - October 5, 2018 **Category: **Physics **Source Type: **research

**Possible higher temperature superconductivity in the modulation-doped superlattice structure of cuprate superconductors**

Publication date: 16 November 2018Source: Physics Letters A, Volume 382, Issue 45Author(s): Kazuhisa NishiAbstractWe design a new structure for a cuprate superconductor indicating the possibility of higher temperature superconductivity using our recently proposed composite fermions theory. It is constructed with modulation-doped superlattice structures, which are often used in the design of semiconductor superlattice devices. The superconductive critical temperature (Tc) was calculated in the superlattice structures of the superconductor in which the optimal doped CuO2 layer was sandwiched between two less-doped CuO2 layer...

**Source: **Physics Letters A - October 5, 2018 **Category: **Physics **Source Type: **research

**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