Beyond the Vegard's law: solid mixing excess volume and thermodynamic potentials prediction, from end-members
Publication date: Available online 15 October 2019Source: Physics Letters AAuthor(s): Marcello Merli, Alessandro PaveseAbstractA method has been developed, herein presented, to model binary solid solutions' volume, enthalpy and Gibbs energy using the energy state functions, E(V,S), of the end-members only. The E(V,S)s are expanded around an unknown mixing volume, VMix, and the fundamental equilibrium equation −(∂E/∂V)S=P is used to determine VMix. VMix allows us to model enthalpy, straightforwardly. The same argument holds using Helmholtz energy, F(V,T), in place of E(V,S), and the equilibrium equation beco...
Source: Physics Letters A - October 16, 2019 Category: Physics Source Type: research

Self-consistent mean-field theory to anisotropic ferrimagnetic chain with bond alternation
Publication date: Available online 14 October 2019Source: Physics Letters AAuthor(s): Xin Yang, Yuge Chen, Bin ChenAbstractWe investigate the finite temperature properties of anisotropic ferrimagnetic chain with bond alternation. The spin excitation spectrum as well as the thermodynamic quantities are calculated by means of the extended self-consistent mean-field theory. Two branches of energy spectrum are obtained and the energy gap between them is 1.7641 at zero temperature which agrees quite well with other numerical results. The contribution of bonding alternation δ, anisotropy λ and magnetic field H to th...
Source: Physics Letters A - October 15, 2019 Category: Physics Source Type: research

A shape memory alloy-based tunable phononic crystal beam attached with concentrated masses
Publication date: Available online 14 October 2019Source: Physics Letters AAuthor(s): Xu-Feng Lv, Shao-Feng Xu, Zhi-Long Huang, Kuo-Chih ChuangAbstractShape memory alloys (SMAs) in phononic crystals (PCs) or metamaterials mostly serve as smart inserts or local resonators to generate tunable bandgaps for other structures. In this letter, we address the method for creating tunable bandgaps in structures made of SMA. Specifically, we consider concentrated masses, realized by steel balls, as attachments on a SMA. To provide a design guideline, we derived the closed-form bandgap formula of the proposed SMA PC beam. As the bandg...
Source: Physics Letters A - October 15, 2019 Category: Physics Source Type: research

High coercivity in α-Fe2O3 nanostructures synthesized by surfactant-free microwave-assisted solvothermal method
In this report, the cube-like shaped α-Fe2O3 nanostructures were prepared by the simple microwave-assisted solvothermal method without using any surfactants. The as-prepared samples were characterized by X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy and field emission scanning electron microscopy. The well dispersed and size-controlled cubic-like shaped α-Fe2O3 nanostructures were obtained by systematic variation of solvents, reaction temperature and time. The magnetic studies manifest that the magnetic properties of α-Fe2O3 samples are strongly dependent on the shape and ...
Source: Physics Letters A - October 13, 2019 Category: Physics Source Type: research

Preface
Publication date: Available online 11 October 2019Source: Physics Letters AAuthor(s): Ming Liu, Ziyao Zhou, Zhongqiang Hu (Source: Physics Letters A)
Source: Physics Letters A - October 13, 2019 Category: Physics Source Type: research

Splitting and rotating of optical vortices due to non-circular symmetry in amplitude and phase distributions of host beams
Publication date: Available online 10 October 2019Source: Physics Letters AAuthor(s): Guo Liang, Wenjing ChengAbstractDiscussed is the dynamics of optical vortices carrying multi-topological charges, which are nested in optical envelopes with non-circular symmetric amplitudes and phases. As a result of the non-circular symmetry either in amplitudes or in phases, the vortices can split in pairs from the centers of the host beams. During the splitting process of every constituent vortex, its carried integer charges evolves into fractional ones. Furthermore, an overall rotations of the host optical envelopes are found to happ...
Source: Physics Letters A - October 11, 2019 Category: Physics Source Type: research

Editors
Publication date: 5 December 2019Source: Physics Letters A, Volume 383, Issue 34Author(s): (Source: Physics Letters A)
Source: Physics Letters A - October 11, 2019 Category: Physics Source Type: research

Effects of electric and magnetic fields on electronic states and transport of a Hall bar
Publication date: Available online 8 October 2019Source: Physics Letters AAuthor(s): Gen-Hua Liu, Hui-Ying Zhou, Piao-Rong XuAbstractWe study the edge-state band and transport property for a HgTe/CdTe quantum well Hall bar under the combined coupling of a transverse electric field and a perpendicular magnetic field. It is demonstrated that a weak magnetic field can protect one of the two edge states, open or enlarge a gap of the other edge state in the Hall bar. However, an appropriate electric field can remove the gap, restoring the quantum spin Hall effect. Using the scattering matrix method, we study the electronic tran...
Source: Physics Letters A - October 10, 2019 Category: Physics Source Type: research

High thermoelectric performance can be achieved in two-dimensional (PbTe)2 layer
Publication date: Available online 8 October 2019Source: Physics Letters AAuthor(s): Caiyu Sheng, Dengdong Fan, Huijun LiuAbstractThe electronic, phonon and thermoelectric transport properties of (PbTe)2 layer are investigated by using first-principles pseudopotential method combined with Boltzmann transport equation. We demonstrate that there is a valley degeneracy of six for the top valence band, which leads to larger carrier concentration and thus higher electrical conductivity without obvious reduction in the Seebeck coefficient. Moreover, the intrinsic van der Waals interactions between neighboring Pb layers induce ad...
Source: Physics Letters A - October 10, 2019 Category: Physics Source Type: research

Enhancement of image quality by using metamaterial inspired energy harvester
Publication date: Available online 9 October 2019Source: Physics Letters AAuthor(s): Fatih Ozkan Alkurt, Olcay Altintas, Meliksah Ozakturk, Muharrem Karaaslan, Oguzhan Akgol, Emin Unal, Cumali SabahAbstractMetamaterial energy harvester based subwavelength imaging structure is presented. Besides, 2×2 array patch antenna is designed to create incident radiated signal towards the proposed harvester structure. Harvested energy is converted to DC voltage signal by using Schottky diodes and each cell is represented by 256 grey levelled pixel value. Therefore, any incident electromagnetic wave placed in the operating freque...
Source: Physics Letters A - October 10, 2019 Category: Physics Source Type: research

Emergence of seismic metamaterials: Current state and future perspectives
Publication date: Available online 7 October 2019Source: Physics Letters AAuthor(s): Stéphane Brûlé, Stefan Enoch, Sébastien GuenneauAbstractFollowing the advent of electromagnetic metamaterials, researchers working in wave physics have translated concepts of engineered media to acoustics, elastodynamics and diffusion processes. In elastodynamics, seismic metamaterials have emerged in the last decade for soft soils structured at the meter scale, and have been tested with full-scale experiments on holey soils. Born in the soil, seismic metamaterials have emerged from the field of tuned-resonators ...
Source: Physics Letters A - October 10, 2019 Category: Physics Source Type: research

Resonant-interaction-induced Rydberg antiblockade and its applications
Publication date: Available online 8 October 2019Source: Physics Letters AAuthor(s): Jin-Lei Wu, Jie Song, Shi-Lei SuAbstractDifferent from the conventional Rydberg antiblockade (RAB) regime that either requires weak Rydberg-Rydberg interaction (RRI), or compensates the RRI-induced energy shift by introducing off-resonant interactions, we show that RAB regime can be achieved by resonantly driving the transitions between ground state and Rydberg state under strong RRI. The Rabi frequencies are of small amplitude and time-dependent harmonic oscillation, which plays a critical role for the presented RAB. The proposed unconven...
Source: Physics Letters A - October 10, 2019 Category: Physics Source Type: research

Detection of exhaled gas by γ-graphyne and twin-graphene for early diagnosis of lung cancer: A density functional theory study
Publication date: Available online 8 October 2019Source: Physics Letters AAuthor(s): Roya Majidi, Marzieh NadafanAbstractIn lung cancer, primary diagnosis is quite essential to guarantee human health. In this work, the capability of γ-graphyne and twin-graphene sheets to detect typical breath gases such as benzene, styrene, aniline, and o-toluidine is studied based on density functional theory. The results indicate that these gases are physisorbed on γ-graphyne and twin-graphene. Because of relatively low gas binding strength between gases and γ-graphyne and twin-graphene, these sheets can be proper for t...
Source: Physics Letters A - October 10, 2019 Category: Physics Source Type: research

High coercivity in α-FeO32 nanostructures synthesized by surfactant-free microwave-assisted solvothermal method
In this report, the cube-like shaped α-Fe2O3 nanostructures were prepared by the simple microwave-assisted solvothermal method without using any surfactants. The as-prepared samples were characterized by X-ray diffraction, Raman spectroscopy, Fourier transform infrared spectroscopy and field emission scanning electron microscopy. The well dispersed and size-controlled cubic-like shaped α-Fe2O3 nanostructures were obtained by systematic variation of solvents, reaction temperature and time. The magnetic studies manifest that the magnetic properties of α-Fe2O3 samples are strongly dependent on the shape and ...
Source: Physics Letters A - October 10, 2019 Category: Physics Source Type: research

Gaussian states as minimum uncertainty states
Publication date: Available online 8 October 2019Source: Physics Letters AAuthor(s): Shuangshuang Fu, Shunlong Luo, Yue ZhangAbstractIn bosonic fields, Gaussian states, which consist of a rather wide family of states including coherent states, squeezed states, thermal states, etc., have many classical-like features, and are usually defined from the mathematical perspective in terms of characteristic functions. It is well known that some special Gaussian states, such as coherent states, are minimum uncertainty states for the conventional Heisenberg uncertainty relation involving canonical pair of position and momentum obser...
Source: Physics Letters A - October 10, 2019 Category: Physics Source Type: research

Characteristics of anodic glow pulsed plasma
Publication date: Available online 8 October 2019Source: Physics Letters AAuthor(s): M. Kiruthika, G. ShanmugavelayuthamAbstractUsing the triple Langmuir probe, the characteristics of the glowing plasma adjacent to a constricted anode is obtained. The glow discharge is generated by applying a train of high voltage pulses between the constricted anode and cylindrical cathode with a pulse frequency of 2 kHz at 50% duty cycle. The axial plasma characteristics along the central line of the anode shows crest and trough resembling a double layer. The bulk plasma showed uniform electron density outside the glow. The visual images...
Source: Physics Letters A - October 10, 2019 Category: Physics Source Type: research

Mechanical properties, lattice thermal conductivity, infrared and Raman spectrum of the fullerite C24
In this study, the stability, mechanical properties, lattice thermal conductivity, electronic structure, infrared and Raman spectrum of sp3 hybridized low-density fullerite C24 were investigated according to density functional theory (DFT) calculations. It was found that the fullerite C24 was both thermodynamic and dynamic stable. Quasi-harmonic approximation and Grüneisen parameter calculations clarified why the fullerite C24 had a positive thermal expansion coefficient at low temperature. The fullerite C24 also exhibited excellent mechanical properties. Interestingly, the Vickers hardness of carbon allotropes was fo...
Source: Physics Letters A - October 10, 2019 Category: Physics Source Type: research

Gravitational wave emission from quadrupole Josephson junction device
Publication date: Available online 8 October 2019Source: Physics Letters AAuthor(s): Victor AtanasovAbstractWe suggest a hybrid quantum mechanical/classical set up capable of gravitational wave emission. The proposed device consists of two superconducting tunneling junctions which act as quantum voltage-to-frequency converters and produce oscillation of the charges (masses) in the superconducting condensate. The classical interpretation of the set up is associated with the particular arrangement which leads to suppression of the dipole radiation and formation of time dependent quadrupole mass moment - the gravitational wav...
Source: Physics Letters A - October 10, 2019 Category: Physics Source Type: research

Nonlocal behaviors of spin correlations in the Haldane-Shastry model
Publication date: Available online 8 October 2019Source: Physics Letters AAuthor(s): Maowen Tang, Yan HeAbstractThe nonlocal factors of spin correlations are introduced for lattice spin models. Based on this concept, we investigate the nonlocal behavior of the Haldane-Shastry model with or without ring frustration. The ground state and spin correlations of the Haldane-Shastry model are calculated for both even and odd number of spins, then the nonlocal factors can be deduced analytically. It is found that the nonlocal factor due the ring frustration is the same as the Heisenberg model. (Source: Physics Letters A)
Source: Physics Letters A - October 10, 2019 Category: Physics Source Type: research

Comment on “Convergence towards asymptotic state in 1-D mappings: A scaling investigation” [Phys. Lett. A 379 (2015) (18–19) 1246-1250]
Publication date: Available online 3 October 2019Source: Physics Letters AAuthor(s): Mauricio Girardi-Schappo, Marcelo H.R. TragtenbergAbstractNonequilibrium phase transitions are characterized by the so-called critical exponents, each of which is related to a different observable. Systems that share the same set of values for these exponents also share the same universality class. Thus, it is important that the exponents are named and treated in a standardized framework. In this comment, we reinterpret the exponents obtained by Teixeira et al. [1] for the logistic and cubic maps in order to correctly state the universalit...
Source: Physics Letters A - October 4, 2019 Category: Physics Source Type: research

Bifurcations and solutions for the generalized nonlinear Schrödinger equation
Publication date: Available online 3 October 2019Source: Physics Letters AAuthor(s): Lingxi Du, Yuhuai Sun, Dashan WuAbstractThe theory of bifurcations for dynamical system is employed to construct new exact solutions of the generalized nonlinear Schrödinger equation. Firstly, the generalized nonlinear Schrödinger equation was converted into ordinary differential equation system by using traveling wave transform. Then, the system's Hamiltonian, orbits phases diagrams are found. Finally, six families of solutions are constructed by integrating along difference orbits, which consist of Jacobi elliptic function solu...
Source: Physics Letters A - October 4, 2019 Category: Physics Source Type: research

Fisher information for endohedrally confined hydrogen atom
Publication date: Available online 3 October 2019Source: Physics Letters AAuthor(s): Liangyong Wu, Shengqi Zhang, Bowen LiAbstractElectron localization and delocalization of endehedrally confined hydrogen atom has been investigated employing Fisher information theory. Confinement has been modeled using a spherical Gaussian-type potential. B-spline bases expansion method was used to solve the Schrödinger equation to obtain the required energy eigenvalues and the corresponding wave functions. Changes in energies with depths of potential are explained using Hellmann-Feynman theorem. The behavior of Fisher information aga...
Source: Physics Letters A - October 4, 2019 Category: Physics Source Type: research

Separation coordinates in Hénon-Heiles systems
Publication date: Available online 3 October 2019Source: Physics Letters AAuthor(s): Nicola SottocornolaAbstractIn this paper we apply the method of the Kowalewski's Conditions to separate the seven Hénon-Heiles integrable systems. For each of them we provide explicitly the separation coordinates in the form of eigenvalues of a matrix M called Control Matrix. A couple of systems (HH3 KK and HH4 1:12:16) are presented and discussed in a more general form than usually in the literature. We show that the process of separation of coordinates can be reduced, at the end, to the choice of a single function and, eventually,...
Source: Physics Letters A - October 4, 2019 Category: Physics Source Type: research

Free energy of nonideal two-component thermal plasma
Publication date: Available online 3 October 2019Source: Physics Letters AAuthor(s): A.V. Shavlov, V.A. DzhumandzhiAbstractThe free energy of nonideal two-component thermal plasma is calculated using the Poisson-Boltzmann equation. The possibility of the existence of a metastable state is shown for a component of heavy multicharged particles with particle charge values bounded from below and plasma temperature values bounded from above. The component of oppositely-charged light singly-charged particles and plasma generally do not feature the metastable state. (Source: Physics Letters A)
Source: Physics Letters A - October 4, 2019 Category: Physics Source Type: research

Numerical and experimental investigations on the band-gap characteristics of metamaterial multi-span beams
Publication date: Available online 3 October 2019Source: Physics Letters AAuthor(s): Shuaimin Hao, Zhijing Wu, Fengming Li, Chuanzeng ZhangAbstractA novel metamaterial multi-span beam with periodic simple supports and local resonators is designed and investigated. The frequency responses of the proposed metamaterial multi-span beam are computed by the spectral element method (SEM). The accuracy and feasibility of the SEM are verified by the finite element method (FEM) and the vibration experiments. The results show that the metamaterial multi-span beam could generate both the local resonance band-gaps in the low-frequency ...
Source: Physics Letters A - October 4, 2019 Category: Physics Source Type: research

Optical solitons with complex Ginzburg–Landau equation having three nonlinear forms
Publication date: Available online 3 October 2019Source: Physics Letters AAuthor(s): Saima Arshed, Anjan Biswas, Fouad Mallawi, Milivoj R. BelicAbstractThis paper secures, dark, singular and dark–singular combo optical soliton solutions to complex Ginzburg–Landau equation that is considered with three nonlinear forms. Two forms of integration architectures provide these solutions. (Source: Physics Letters A)
Source: Physics Letters A - October 4, 2019 Category: Physics Source Type: research

Supersonic crowdion clusters in 2D Morse lattice
Publication date: Available online 3 October 2019Source: Physics Letters AAuthor(s): I.A. Shepelev, E.A. Korznikova, D.V. Bachurin, A.S. Semenov, A.P. Chetverikov, S.V. DmitrievAbstractFor the first time, the class of simple N-crowdions is expanded to M×N-crowdions, dynamics of which is investigated in two-dimensional triangular Morse lattice by means of molecular dynamics simulations. The M×N-crowdions are excited by giving initial velocity V0 to the chosen M×N block of atoms along a close-packed direction. In the notations here N is the number of neighboring atoms in one close-packed row and M is the nu...
Source: Physics Letters A - October 4, 2019 Category: Physics Source Type: research

Nonlocal heat conduction in suspended graphene
Publication date: Available online 2 October 2019Source: Physics Letters AAuthor(s): Mingtian XuAbstractIn order to investigate the mechanism of the extremely high thermal conductivity of the suspended graphene, a nonlocal heat conduction model of heat conduction in two-dimensional materials under a temperature gradient along the length direction is proposed. This model shows that the heat transport of the suspended graphene along the length direction under the nonlocal effect in the width and thickness directions demonstrates a similarity with the viscous Poiseuille flow between two parallel plates. Based on this model, t...
Source: Physics Letters A - October 3, 2019 Category: Physics Source Type: research

Ultra-broadband metamaterial absorber for infrared transparency window of the atmosphere
Publication date: Available online 2 October 2019Source: Physics Letters AAuthor(s): Ling Li, Hongjie Chen, Zhengwei Xie, Weidong Chen, Wenpeng Zhang, Wuming Liu, Ling LiAbstractThe broadband absorber at the wavelength range from 8 to 13 μm has attracted much attention because this range is exactly the infrared transparency window of the atmosphere. In this Letter, we propose a new structure of ultra-broadband absorber, which is composed of a periodic array of single-sized titanium (Ti) patches and a sandwich (Ti/SiO2/Ti) plane. In the infrared transparency window of the atmosphere, the structure proposed can achieve ne...
Source: Physics Letters A - October 3, 2019 Category: Physics Source Type: research

The effect of probe-Ohmic environment coupling type and probe information flow on quantum probing of the cutoff frequency
Publication date: Available online 2 October 2019Source: Physics Letters AAuthor(s): Fahimeh Salari Sehdaran, Mohammad H. Zandi, Alireza BahrampourAbstractThis work aims to compare results of dissipating and pure dephasing single-qubit probes in characterizing the cutoff frequency of a harmonic reservoir Ohmic spectral density. In particular, we proved that a dissipating single-qubit improves the estimation precision of the cutoff frequency estimator. The information backflow and outflow of the dissipating and the dephasing single-qubit are compared. The relation between the quantum Fisher information and the information o...
Source: Physics Letters A - October 3, 2019 Category: Physics Source Type: research

Convective boson-fermion pairing mode in one-dimensional oscillating optical superlattice
Publication date: Available online 1 October 2019Source: Physics Letters AAuthor(s): Tieyan SiAbstractA convective pairing mode of a boson-fermion mixture of ultracold atoms confined in an optical superlattice can be induced by the transformation between two optical superlattice configurations. This convective pairing mode only exists in discrete momentum vector zones for pairing energy gaps. The energy spectrum of gapped states is characterized by topological winding numbers, which is characterized by topological winding numbers characterize the energy spectrum of gapped states. Two neighboring gapped states are bridged b...
Source: Physics Letters A - October 3, 2019 Category: Physics Source Type: research

Pressure controllable phase transition in MoTe2 by the interlayer band occupancy
Publication date: Available online 1 October 2019Source: Physics Letters AAuthor(s): J.G. Si, W.J. Lu, H.Y. Lv, B.C. Zhao, Y.P. SunAbstractHigh pressure can effectively control the phase transition of MoTe2 in experiment, but the mechanism is still unclear. In this work, we show by first-principles calculations that the phase transition is suppressed and 1T′ phase becomes more stable under high pressure, which originates from the pressure-induced change of the interlayer band occupancies near the Fermi energy. Specifically, the interlayer states of 1T′ phase tend to be fully occupied under high pressure, while ...
Source: Physics Letters A - October 3, 2019 Category: Physics Source Type: research

Editors
Publication date: 28 November 2019Source: Physics Letters A, Volume 383, Issue 33Author(s): (Source: Physics Letters A)
Source: Physics Letters A - October 3, 2019 Category: Physics Source Type: research

Asymptotic behavior of two-electron expectation values in two-electron excited states
Publication date: Available online 27 September 2019Source: Physics Letters AAuthor(s): H.E. Montgomery, Jacob Katriel, K.D. SenAbstractSingly-excited states of the two-electron atom cease being bound when Z→1 (from above), the outer orbital becoming infinitely diffuse. The asymptotic relationslimZ→1⁡(Z−1)k〈(1sns)1,3S|r12k|(1sns)1,3S〉=〈(n−1)s(0)|rk|(n−1)s(0)〉, where k=−1,1,2,3,⋯, are demonstrated to hold. Here, (n−1)s(0) is a hydrogenic s orbital with principal quantum number (n−1). New, more nuanced light is shed on the already challenged dogma that the Pauli princ...
Source: Physics Letters A - September 29, 2019 Category: Physics Source Type: research

Security of continuous-variable measurement-device-independent quantum key distribution with imperfect state preparation
Publication date: Available online 26 September 2019Source: Physics Letters AAuthor(s): Hong-Xin Ma, Peng Huang, Tao Wang, Shi-Yu Wang, Wan-Su Bao, Gui-Hua ZengAbstractThe state preparation operation of continuous-variable measurement-device-independent quantum key distribution (CV-MDI-QKD) protocol may become imperfect in practical applications. We address the security of the CV-MDI-QKD protocol based on imperfect preparation of the coherent state under realistic conditions of lossy and noisy quantum channel. Specifically, we assume that the imperfection of Alice's and Bob's practical state preparations equal to the ampli...
Source: Physics Letters A - September 27, 2019 Category: Physics Source Type: research

Editors
Publication date: 18 November 2019Source: Physics Letters A, Volume 383, Issue 32Author(s): (Source: Physics Letters A)
Source: Physics Letters A - September 27, 2019 Category: Physics Source Type: research

Encapsulation of glycine inside C60 fullerene: Impact of confinement
Publication date: Available online 25 September 2019Source: Physics Letters AAuthor(s): Mozhgan Shahamirian, S.M. AzamiAbstractConfinement of glycine inside C60 fullerene (gly@C60) is analyzed via geometrical, energetic and deformation density of intermolecular interaction. Results shows that the both fragments are significantly deformed due to the compression imposed by the confinement. Also kinetic energy pressure and relaxation deformation density analyses are used to describe the nature of interaction between components, and topological analysis of the steric deformation density in gly@C60 was carried out to find the c...
Source: Physics Letters A - September 26, 2019 Category: Physics Source Type: research

Effect of the third component on charge transfer character in ternary organic solar cells with a cascade-type electronic structure
Publication date: Available online 24 September 2019Source: Physics Letters AAuthor(s): Lingxia Xu, Chong Li, Xiaotao Hao, Kun GaoAbstractBy incorporating a third component into the host donor/acceptor organic components, we theoretically investigate the effects of its electronic structure and spatial location on charge transfer character. It is found that both of the two factors can modulate the distribution of transferred charges, and thus change the role of the third component in charge transfer (i.e., electron donor or acceptor). The binding energy of the formed charge transfer (CT) state is also determined by the two ...
Source: Physics Letters A - September 26, 2019 Category: Physics Source Type: research

Correlation effects and configuration of a one-dimensional bipolaron
Publication date: Available online 24 September 2019Source: Physics Letters AAuthor(s): N.I. Kashirina, V.D. LakhnoAbstractThe aim of the work is to study the structure of a one-dimensional (1D) bipolaron, taking into account three types of correlation effects: such as interelectronic correlations caused by the direct dependence of the wave function on the distance between electrons as well as the one-center and two-center correlations. Gaussian orbitals with exponentially-correlated multipliers were used for variational calculations. In is shown that in the domain of existence of an 1D optical bipolaron – unlike in ...
Source: Physics Letters A - September 26, 2019 Category: Physics Source Type: research

Enhanced out-of-plane thermoelectric performance of Cmcm SnSe phase by uniaxial strain
Publication date: Available online 24 September 2019Source: Physics Letters AAuthor(s): Donglin Guo, Chunhong Li, Qiqi Yang, Kejian Li, Bin Shao, Dengming Chen, Yilong Ma, Jianchun Sun, Xianlong Cao, Wen Zeng, Zhongchang Wang, Haie ZhuAbstractThe electronic structure and thermoelectric property of SnSe are calculated by first-principles methods and Boltzmann transport theory. The deformation potential approximation and single parabolic band model are employed to compute the relaxation time. Owing to the accurate electronic structure calculated by Tran-Blaha modified Becke-Johnson (TB-mBJ) potential, the theoretical data (S...
Source: Physics Letters A - September 26, 2019 Category: Physics Source Type: research

Modelling the effect of heterogeneous vaccination on metapopulation epidemic dynamics
Publication date: Available online 23 September 2019Source: Physics Letters AAuthor(s): Yongwang Gong, Michael SmallAbstractVaccination as an epidemic control strategy has a significant effect on epidemic spreading. In this paper, we propose a novel epidemic spreading model on metapopulation networks to study the impact of heterogeneous vaccination on epidemic dynamics, where nodes represent geographical areas and links connecting nodes correspond to human mobility between areas. Using a mean-field approach, we derive the theoretical spreading threshold revealing a non-trivial dependence on the heterogeneity of vaccination...
Source: Physics Letters A - September 24, 2019 Category: Physics Source Type: research

Transmission control by asymmetric electromagnetically induced transparency-like metamaterials in transverse electromagnetic waveguide
Publication date: Available online 23 September 2019Source: Physics Letters AAuthor(s): Fulya Bagci, Baris AkaogluAbstractWe numerically and experimentally present passive and active electromagnetically induced transparency-like metamaterials in a TEM waveguide under normal excitation. Asymmetry of the metamaterial unit cell leads to the splitting of the radiative resonance. Surface current distributions are analyzed to account for each resonance. Moreover, by implementing a varactor diode to one of the gaps of the double-split ring resonator, electromagnetically induced transmission-like band is shifted in frequency and t...
Source: Physics Letters A - September 24, 2019 Category: Physics Source Type: research

Control of light in a quantized four level graphene atomic system via self and cross-Kerr nonlinearity
Publication date: Available online 23 September 2019Source: Physics Letters AAuthor(s): Usman Khan, Bakht Amin, Arif Ullah, Kefayat UllahAbstractWe investigate self and cross-Kerr nonlinearity in a four level quantized graphene atomic medium. The absorption, dispersion, transmission and subluminal/superluminal behaviors of a probe light field are studied. An amplification of the probe light field is observed in the absorption spectrum. The normal and anomalous slope of dispersion is also investigated at the positive/negative absorption region. It is shown that Kerr nonlinearity invert and enhance the subluminal/superlumina...
Source: Physics Letters A - September 24, 2019 Category: Physics Source Type: research

Comment on “Stabilization of trapless Bose-Einstein condensates without any management” [Phys. Lett. A, 383(17) (2019) 2033-2038]
Publication date: Available online 23 September 2019Source: Physics Letters AAuthor(s): Zhao-Hui Wang, Ji-Xuan HouAbstractA recent paper by T. Ramakrishnan and S. Subramaniyan shows that there is an enhancement of the stability of the trapless BECs due to the inclusion of the higher-order interaction along with the two-and three-body interactions. We point out and correct the erroneous results calculated by the authors concerning the effective potential of the trapless BECs. In addition we have shown that the incorrect expression used by authors leads to notable discrepancies between such results and exact ones. Moreover, ...
Source: Physics Letters A - September 24, 2019 Category: Physics Source Type: research

Convergence of chaotic attractors due to interaction based on closeness
Publication date: Available online 23 September 2019Source: Physics Letters AAuthor(s): Sayantan Nag Chowdhury, Soumen Majhi, Dibakar Ghosh, Awadhesh PrasadAbstractExploration of coherence phenomena in ensembles of interacting dynamical systems has been in the centre of research in social, physical, biological and technological systems for decades. But, in most of the studies, either completely percolated time- and space-static networks or temporal connectivities disregarding the systems' own dynamics have been dealt with. In this work, we examine the correlation between structural and dynamical evolution in networks of in...
Source: Physics Letters A - September 24, 2019 Category: Physics Source Type: research

Anisotropic strain effects on light emission characteristics of CdZnO/ZnO quantum well structures
Publication date: Available online 23 September 2019Source: Physics Letters AAuthor(s): Seoung-Hwan ParkAbstractAnisotropic strain effects by strain relaxation on TE-polarized light emission characteristics of c-plane CdZnO/ZnO quantum well (QW) structures were theoretically investigated by using the multiband effective-mass theory. The CdZnO/ZnO QW structure with anisotropic strain has much larger emission intensity than conventional CdZnO/ZnO QW structure without the strain relaxation. In the case of the strain relaxation along x(or y)-direction, the x(or y)-polarized light emission is observed to be larger than the x(or...
Source: Physics Letters A - September 24, 2019 Category: Physics Source Type: research

Electronic and transport properties of zigzag-edge monolayer/bilayer phosphorene nanoribbon junctions under a perpendicular electric field
Publication date: Available online 20 September 2019Source: Physics Letters AAuthor(s): Jie Gong, Benhu Zhou, Benliang ZhouAbstractWe study the electronic and transport properties of monolayer/bilayer/bilayer (ML/BL/BL) and monolayer/bilayer/monolayer (ML/BL/ML) zigzag-edge phosphorene nanoribbon (ZPNR) junctions modulated by a perpendicular electric field (PEF). Within the tight-binding model Hamiltonian and by adopting the nonequilibrium Green's function, it is demonstrated that some oscillating conductance plateaus appear for the junctions, and the conductances are suppressed by the applied PEF. Interestingly, the direc...
Source: Physics Letters A - September 21, 2019 Category: Physics Source Type: research

Enhancement of THz absorption in monolayer graphene for light at Brewster angle incidence
Publication date: Available online 20 September 2019Source: Physics Letters AAuthor(s): Jun WuAbstractThe enhancement of absorption in graphene for light at Brewster angle incidence is investigated. It is achieved by placing a graphene on a resonant Brewster filter that incorporating a spacer layer. The absorber presents above 50% absorption at resonance, which is attributed to the excitation of guided mode resonances. The electromagnetic field intensity distributions are illustrated to intuitively confirm the physical mechanism of such phenomenon. Moreover, the influence of geometric parameters on absorption is investigat...
Source: Physics Letters A - September 21, 2019 Category: Physics Source Type: research

Prediction of 2D Li2X (X=Se, Te) monolayer semiconductors by first principles calculations
Publication date: Available online 18 September 2019Source: Physics Letters AAuthor(s): Mosayeb Naseri, D.M. HoatAbstractTwo dimensional monolayer materials play important roles in new generation of electronic and optical devices in nano scale. In this paper, by using first principles calculations, the existence of 2D Li2X (X=Se, Te) monolayer materials are theoretically predicted. Through cohesive energy calculation and phonon dispersion simulation, it is proved that the proposed 2D Li2Se and Li2Te monolayer materials are energetically and dynamically stable suggests their potential experimental realization. Our study sho...
Source: Physics Letters A - September 20, 2019 Category: Physics Source Type: research

Electronic properties of novel bismuthene nanosheets with adsorption studies of G-series nerve agent molecules – a DFT outlook
Publication date: Available online 18 September 2019Source: Physics Letters AAuthor(s): R. Bhuvaneswari, V. Nagarajan, R. ChandiramouliAbstractIn order to confirm the ability of bismuthene nanosheet in detecting the G-series nerve agents, electronic and adsorption properties are investigated. The alteration in the band gap is observed (from the energy band structure) upon adsorption of G-series nerve agents, which results in the modification in the conductivity of BiNS. In addition, to establish the potential application of BiNS as a nerve agent sensor, the adsorption energy, average energy gap variation and Bader charge t...
Source: Physics Letters A - September 20, 2019 Category: Physics Source Type: research