**Comparing geometric discord and negativity for bipartite states**

Publication date: Available online 18 September 2019Source: Physics Letters AAuthor(s): Priyabrata Bag, Santanu Dey, Hiroyuki OsakaAbstractThe geometric discord D of a state is a measure of the quantumness of the state and the negativity N is a measure of the entanglement of a state. It was proved by D. Girolami and G. Adesso that for states on C2⊗C2, the geometric discord is always greater than or equal to the square of the negativity and conjectured that this holds in general. S. Rana and P. Parashar showed that this relation does not hold for all states on C2⊗Cn for n>2. We provide several analytic fami...

**Source: **Physics Letters A - September 20, 2019 **Category: **Physics **Source Type: **research

**Effect of pressure and temperature on spin-dependent tunneling in InAs/GaAs heterostructure with Dresselhaus spin-orbit interaction**

Publication date: Available online 18 September 2019Source: Physics Letters AAuthor(s): L. Bruno Chandrasekar, M. Karunakaran, K. GnanasekarAbstractUsing the transfer matrix, spin-dependent electron tunneling was studied in InAs/GaAs double barrier symmetrical heterostructure. The effect of Dresselhaus spin-orbit interaction in this system was analysed as a function of pressure and temperature. Both pressure and temperature influences the polarization efficiency, barrier transparency and dwell time of electrons. The increasing pressure increases polarization efficiency, tunneling life time and dwell time of electrons, wher...

**Source: **Physics Letters A - September 20, 2019 **Category: **Physics **Source Type: **research

**RKKY interaction in the zigzag-edge silicene-like nanoflake**

Publication date: Available online 18 September 2019Source: Physics Letters AAuthor(s): Fatemeh Mazhari Mousavi, Rouhollah FarghadanAbstractBy considering the Kane-Mele-Hubbard approximation on the honeycomb lattice, we investigate the spin-spin correlation for two magnetic impurities in zigzag edge silicene-like nanoflake (ZSiLF). The dependence of the spatial behaviors of RKKY interaction on the electron-electron (e-e), intrinsic spin-orbit interactions (ISOI) and, electric field are systematically investigated. Generally, the spatial behaviors of the RKKY interaction sensitively change by changing e-e interaction and el...

**Source: **Physics Letters A - September 20, 2019 **Category: **Physics **Source Type: **research

**Carrier mobility and relaxation time in BiCuSeO**

Publication date: Available online 17 September 2019Source: Physics Letters AAuthor(s): Jian Liu, Qiao-Yu Jiang, Shi-Da Zhang, Heng ZhangAbstractTo obtain thermoelectric properties of materials, a constant relaxation time approximation is generally employed. By employing deformation potential theory, a derivation of relaxation time and carrier mobility of BiCuSeO system is proposed combining with density functional theory calculation. And the inter-valley scattering, acoustic phonon scattering and ionized impurity scattering were considered in the model. The calculated values of relaxation time and carrier mobility in BiCu...

**Source: **Physics Letters A - September 18, 2019 **Category: **Physics **Source Type: **research

**Half-metallicity modulation of zigzag BC2N nanoribbons by transverse electric fields: A first principles study**

Publication date: Available online 17 September 2019Source: Physics Letters AAuthor(s): Xiaoling Lü, Jimin Huang, Shuhui Lv, Wenyue Dong, Yanwei Li, Yu Shen, Zhenjun Si, Qian Duan, Yisong ZhengAbstractWe performed density functional theory calculations to investigate the electronic and magnetic properties of H-terminated zigzag BC2N nanoribbons (ZBC2NNRs) with the atoms arranged as B-C-N-C along zigzag lines. The ribbons can be classified into three groups according to the profiles of band structures and edge atoms: BN-BN, CC-CC and BN-CC. Among them, CC-CC and BN-CC ZBC2NNRs behave magnetic ground states. The results...

**Source: **Physics Letters A - September 18, 2019 **Category: **Physics **Source Type: **research

**Observation of topological valley transport of elastic waves in bilayer phononic crystal slabs**

Publication date: Available online 17 September 2019Source: Physics Letters AAuthor(s): Junrui Jiao, Tinggui Chen, Hongqing Dai, Dejie YuAbstractIn this Letter, we propose a unique bilayer design of phononic crystal slabs that are constructed by two layers of snowflake phononic crystal plates connected by a honeycomb array of cylinders. By tuning orientations of snowflake-shaped holes in both layers, we achieve two kinds of valley-projected topological elastic insulators distinguished by conventional and layer-polarized topological valley Hall phases. Then, between different conventional and layer-polarized topological val...

**Source: **Physics Letters A - September 18, 2019 **Category: **Physics **Source Type: **research

**Controlled trapping of single particle states on a periodic substrate by deterministic stubbing**

We present a case here, where the wells have a hierarchically distribution of widths, hosting standing wave solutions in the thermodynamic limit. (Source: Physics Letters A)

**Source: **Physics Letters A - September 18, 2019 **Category: **Physics **Source Type: **research

**Effect of bilayer repeats on magnetic properties of Au-buffered Co/Ni multilayers with perpendicular magnetic anisotropy**

This study provides a deep understanding and effective control of magnetic properties of Co/Ni multilayers for spintronics devices. (Source: Physics Letters A)

**Source: **Physics Letters A - September 18, 2019 **Category: **Physics **Source Type: **research

**Confined clustering of AuCu nanoparticles under ambient conditions**

Publication date: Available online 16 September 2019Source: Physics Letters AAuthor(s): O. Rocha-Rocha, M. Cortez-Valadez, G. Calderón-Ayala, C. Martinez-Nuñez, M. Pedroza-Montero, M. Flores-AcostaAbstractThe study of bimetallic clusters has been increasing in recent years due to the wide range of novel applications, when compared with monometallic nanoparticles This paper presents a simple method of low toxicity to obtain bimetallic nanoparticle clusters of AuCu. The localized surface plasmon resonance (LSPR) of the nanoalloy was located in a value in between those reported for AuNP and CuNP. Raman bands of ...

**Source: **Physics Letters A - September 18, 2019 **Category: **Physics **Source Type: **research

**Optical absorption coefficients in asymmetric quantum well**

Publication date: Available online 13 September 2019Source: Physics Letters AAuthor(s): Chaojin Zhang, Cong Min, Bo ZhaoAbstractThe optical absorption coefficients considering electron-phonon interaction in asymmetrical quantum wells are theoretically studied. The result shows that the optical absorption coefficients depend strongly on the parameters of quantum well. Interestingly, the theoretical values of the optical absorption coefficients obviously increase with considering the electron-phonon interaction. (Source: Physics Letters A)

**Source: **Physics Letters A - September 15, 2019 **Category: **Physics **Source Type: **research

**Border effect corrections for diagonal line based recurrence quantification analysis measures**

Publication date: Available online 13 September 2019Source: Physics Letters AAuthor(s): K. Hauke Kraemer, Norbert MarwanAbstractRecurrence Quantification Analysis (RQA) defines a number of quantifiers, which base upon diagonal line structures in the recurrence plot (RP). Due to the finite size of an RP, these lines can be cut by the borders of the RP and, thus, bias the length distribution of diagonal lines and, consequently, the line based RQA measures. In this letter we investigate the impact of the mentioned border effects and of the thickening of diagonal lines in an RP (caused by tangential motion) on the estimation o...

**Source: **Physics Letters A - September 15, 2019 **Category: **Physics **Source Type: **research

**Dynamical properties of quasiparticles emerged in a nodal ring optical lattice**

Publication date: Available online 13 September 2019Source: Physics Letters AAuthor(s): Xi-Dan Hu, Yu-Lei Huang, Xin Shen, Kai-Yu Liao, Zhi LiAbstractThe dynamics of nodal ring quasiparticles (NRQPs) has been studied in an optical lattice. By tuning the lattice parameters, one can realize a Lifshits phase transition from a nodal ring semi-metallic to a band insulating phase. For the case where the initial state is a wavepacket, an effective Hamiltonian is obtained to simulate the system's dynamics. Analytical result is explicitly derived with the effective Hamiltonian and the dynamics shows the Zitterbewegung motion. We ha...

**Source: **Physics Letters A - September 15, 2019 **Category: **Physics **Source Type: **research

**Stationary and dynamical properties of one-dimensional quantum droplets**

Publication date: Available online 13 September 2019Source: Physics Letters AAuthor(s): Sherzod R. Otajonov, Eduard N. Tsoy, Fatkhulla Kh. AbdullaevAbstractThe dynamics of quantum droplets in 1D is analyzed on the basis of the variational approach (VA). It is shown that the VA based on the super-Gaussian function gives a good approximation of stationary states. The period of small oscillations of the perturbed droplet is obtained. It is found numerically that oscillations are almost undamped for many periods. Based on the VA, an existence of stable localized states for different combinations of signs of nonlinearities is d...

**Source: **Physics Letters A - September 15, 2019 **Category: **Physics **Source Type: **research

**Non-autonomous wave solutions for the Gross-Pitaevskii (GP) equation with a parabola external potential in Bose-Einstein condensates**

Publication date: Available online 13 September 2019Source: Physics Letters AAuthor(s): Chunping Liu, Fajun Yu, Li LiAbstractA Gross-Pitaevskii (GP) equation with a parabola external potential is considered, and is transformed into a standard nonlinear Schrödinger (NLS) equation. By using the homogeneous balance principle and F-expansion method, we study non-autonomous wave solutions of the GP equation with a parabola external potential. In particular, based on the similarity transformation, several families of non-autonomous wave solutions of the GP equation are presented with snaking behaviors and different amplitud...

**Source: **Physics Letters A - September 15, 2019 **Category: **Physics **Source Type: **research

**Computing scalar products via a two-terminal quantum transmission line**

Publication date: Available online 12 September 2019Source: Physics Letters AAuthor(s): J. Stolze, A.I. ZenchukAbstractThe scalar product of two vectors with K real components can be computed using two quantum channels, that is, information transmission lines in the form of spin-1/2 XX chains. Each channel has its own K-qubit sender and both channels share a single two-qubit receiver. The K elements of each vector are encoded in the pure single-excitation initial states of the senders. After time evolution, a bi-linear combination of these elements appears in the only matrix element of the second-order coherence matrix of ...

**Source: **Physics Letters A - September 13, 2019 **Category: **Physics **Source Type: **research

**Neuron model with conductance-resistance symmetry**

Publication date: Available online 12 September 2019Source: Physics Letters AAuthor(s): Bo DengAbstractThis paper is to derive a mathematical model for neuron by imposing only a principle of symmetry that two modelers must obtain the same model when one models the conductances of ion channels and the other models the channels' resistances. Conductance-voltage characteristics for ion transport channels and protein gating channels are both derived. They are expressed as products of maximal conductances and opening probabilities for both types of channel. It gives an explanation to the role of spontaneous firing of individual...

**Source: **Physics Letters A - September 13, 2019 **Category: **Physics **Source Type: **research

**Pseudomagnetic fields and Landau levels for out-of-plane elastic waves in gradient snowflake-shaped crystals**

Publication date: Available online 12 September 2019Source: Physics Letters AAuthor(s): Ji-cheng Luo, Lu-yang Feng, Hong-bo Huang, Jiu-jiu ChenAbstractThe study of pseudomagnetic fields (PMF) in classical waves draws a growing attention due to the strength of PMF far higher than real magnetic fields. Here, we show that a giant PMF for out-of-plane elastic waves can be created in the snowflake-shaped crystals by introducing a gradient angle modulation along one direction. In particular, we demonstrate that the Landau energy levels for out-of-plane elastic waves can be formed near the Dirac cone region, as a hallmark of high...

**Source: **Physics Letters A - September 13, 2019 **Category: **Physics **Source Type: **research

**Observation of flux qubit states with the help of a superconducting differential double contour interferometer**

Publication date: Available online 12 September 2019Source: Physics Letters AAuthor(s): A.V. NikulovAbstractThe critical current of a new structure, the superconducting differential double contour interferometer (DDCI), investigated recently, depends on the parity of the sum of quantum numbers of the two superconducting loops connected in two points by two Josephson junctions. The theory confirms that the DDCI structure can be used for the ideal readout of quantum states of the flux qubit. Large jumps in the critical current and voltage enables to observe continuously the change in time the state of the flux qubit. Such ob...

**Source: **Physics Letters A - September 13, 2019 **Category: **Physics **Source Type: **research

**Influence of dilution on magnetization properties of geometrically frustrated magnetic systems: Effective-field theory cluster approximations on kagome lattice**

Publication date: Available online 12 September 2019Source: Physics Letters AAuthor(s): E. Jurčišinová, M. JurčišinAbstractThe influence of the site dilution on the magnetization properties of the antiferromagnetic spin-1/2 Ising model on the kagome lattice is systematically investigated using various n-site cluster effective-field theory approximations up to the cluster size n=12. It is shown that, regardless of the cluster approximation, the site dilution of the system leads, in addition to the existence of the standard saturated ground state, to the formation of four nontrivial plateau ground stat...

**Source: **Physics Letters A - September 13, 2019 **Category: **Physics **Source Type: **research

**Plasmon modes in 3-layer graphene structures: Inhomogeneity effects**

Publication date: Available online 11 September 2019Source: Physics Letters AAuthor(s): Dong Thi Kim Phuong, Nguyen Van MenAbstractWe calculate the plasmon frequency and damping rate in a 3-layer graphene system made of parallel monolayer and bilayer graphene sheets using the random-phase-approximation dielectric function and taking into account the inhomogeneity of the dielectric background of the system. Numerical results show that two out-of-phase acoustic and one in-phase optical plasmon modes can be found from the zeroes of dynamical dielectric function of the structure. Plasmon frequencies and damping rate of plasma ...

**Source: **Physics Letters A - September 13, 2019 **Category: **Physics **Source Type: **research

**Surface acoustic waves in 2D-phononic crystal of laminated pillars on a semi-infinite ZnO substrate**

Publication date: Available online 11 September 2019Source: Physics Letters AAuthor(s): Tengjiao Jiang, Chunlei Li, Qiang HanAbstractIn this paper a phononic crystal of laminated pillars which are composed of two materials on a semi-infinite ZnO substrate is proposed. The unit cell can be regarded as a double-resonator model, which explicates the variation of band gaps. It is revealed that the band structure of the PC is highly influenced by the proportion of PZT-4 in laminated pillars. Besides, the high-frequency band gaps are the result of combined actions of the local resonance and the Bragg scattering, and the former d...

**Source: **Physics Letters A - September 13, 2019 **Category: **Physics **Source Type: **research

**Conventional and rotating magnetoelectric effect of a half-filled spin-electron model on a doubly decorated square lattice**

Publication date: Available online 10 September 2019Source: Physics Letters AAuthor(s): Hana Čenčariková, Jozef StrečkaAbstractA conventional and rotating magnetoelectric effect of a half-filled spin-electron model on a doubly decorated square lattice is investigated by exact calculations. An importance of the electron hopping and spatial orientation of the electric field upon a magnetoelectric effect is examined in detail. A critical temperature may display one or two consecutive round maxima as a function of the electric field. Although the rotating magnetoelectric effect (RME) does not affect the ground-state ...

**Source: **Physics Letters A - September 12, 2019 **Category: **Physics **Source Type: **research

**Stress generation during anisotropic lithiation in silicon nanopillar electrodes: A reactive force field study**

Publication date: Available online 10 September 2019Source: Physics Letters AAuthor(s): Luoxia Cao, Hui Yang, Feifei FanAbstractModels that are developed to investigate lithiation-induced stress in high-volume-change electrodes are often based on continuum approaches with simplifying assumptions. In this work, we investigate stress generation during the first lithiation of crystalline silicon electrodes solely using atomistic simulations with chemo-mechanical fidelity. We use a -oriented silicon nanopillar as a model system and perform molecular statics simulations with a reactive force field. The simulation approach incor...

**Source: **Physics Letters A - September 12, 2019 **Category: **Physics **Source Type: **research

**Structural and electronic properties of armchair graphene nanoribbons functionalized with fluorine**

Publication date: Available online 9 September 2019Source: Physics Letters AAuthor(s): Kamal K. Jha, Neha Tyagi, Neeraj K. Jaiswal, Pankaj SrivastavaAbstractThe interaction of armchair graphene nanoribbons (AGNR) with F has been investigated by considering it as a passivating element as well as adatom impurity. The adsorption of F at three different sites viz. bridge (B), top (T) and hole (H) is examined to determine the most stable configuration. It is revealed that F passivation is slightly more favorable than the H passivation of AGNR and it also affects the band gap. Interestingly, F adsorbed AGNR exhibit magnetic grou...

**Source: **Physics Letters A - September 10, 2019 **Category: **Physics **Source Type: **research

**Darboux transformation and soliton solutions of the semi-discrete massive Thirring model**

Publication date: Available online 9 September 2019Source: Physics Letters AAuthor(s): Tao Xu, Dmitry E. PelinovskyAbstractA one-fold Darboux transformation between solutions of the semi-discrete massive Thirring model is derived using the Lax pair and dressing methods. This transformation is used to find the exact expressions for soliton solutions on zero and nonzero backgrounds. It is shown that the discrete solitons have the same properties as solitons of the continuous massive Thirring model. (Source: Physics Letters A)

**Source: **Physics Letters A - September 10, 2019 **Category: **Physics **Source Type: **research

**Thermospin effects in a T-shaped spin valves with spin-flip scattering**

Publication date: Available online 9 September 2019Source: Physics Letters AAuthor(s): Li Xu, Caili Zhang, Yanfang HuangAbstractWith the help of the nonequilibrium Green's function technique, we theoretically analyze the thermospin property through a typical T-shaped spin valve with spin-flip scattering in the linear regime. The influences of spin-flip coefficient of interdot λ, spin-flip coefficient of intradot η and interdot hopping coefficient t+δσΔt on thermospin property are discussed. As interdot hopping coefficient t is equal to energy level ε, the spectrum of Gs shows Fano-like ...

**Source: **Physics Letters A - September 10, 2019 **Category: **Physics **Source Type: **research

**Stabilization of E-type antiferromagnetic ordering in La and Y substituted orthorhombic LuMnO3: A first-principles study**

Publication date: Available online 9 September 2019Source: Physics Letters AAuthor(s): Sathya Sheela Subramanian, Sambandam Anandan, Baskaran NatesanAbstractWe carry out first principles density functional theory calculations of non-lone pairs, namely, La and Y substituted orthorhombic LuMnO3, to verify the generality of symmetry breaking effects observed in the lone pair cations substituted orthorhombic rare earth manganites. Our calculations revealed that similar to lone pair cations ordering at the A-site of LuMnO3, non-lone pair cations ordering also results in the lowering of the symmetry thereby proving that the symm...

**Source: **Physics Letters A - September 10, 2019 **Category: **Physics **Source Type: **research

**Exactly solvable chain of interacting electrons with correlated hopping and pairing**

Publication date: Available online 9 September 2019Source: Physics Letters AAuthor(s): Igor N. KarnaukhovAbstractA generalization of the Mattis-Nam model Mattis and Nam (1972) [7], which takes into account a correlated hopping and pairing of electrons, is proposed, its exact solution is obtained. In the framework of the model the stability of the zero energy Majorana fermions localized at the boundaries is studied in the chain in which electrons interact through both the on-site Hubbard interaction and the correlated hopping and pairing. The ground-state phase diagram of the model is calculated, the region of existence of ...

**Source: **Physics Letters A - September 10, 2019 **Category: **Physics **Source Type: **research

**Superalkali NM4 (M = Li, Na, K): Stabilities and electronic structures**

Publication date: Available online 9 September 2019Source: Physics Letters AAuthor(s): Zhaoyan Zhang, Hongshan ChenAbstractSuperatoms are clusters that mimic the chemistry of atoms and new materials with unique properties can be synthesized from them. Superalkali NM4 clusters with homo- and hetero-alkalis M = Li, Na, K are designed, and their vertical ionization potentials (3.22 ∼ 3.74 eV) are lower than that of Cs atom. The stabilities of the superalkalis are guaranteed by the binding energies and positive energies of the dissociation channel NM3 + M, and NLi4 is the most stable among the NM4 clusters. The high st...

**Source: **Physics Letters A - September 10, 2019 **Category: **Physics **Source Type: **research

**Planar metamaterial analogue of electromagnetically induced transparency for a miniature refractive index sensor**

Publication date: Available online 9 September 2019Source: Physics Letters AAuthor(s): Rong Li, Xiang-kun Kong, Shao-bin Liu, Zhi-ming Liu, Yu-meng LiAbstractA planar metamaterial of analogue of Electromagnetically Induced Transparency (EIT-like) is theoretically and experimentally investigated. The EIT-like metamaterial unit cell, whose electrical size is only 0.2λ0, consists of a split ring resonator (SRR) and a folded-line pair resonator (FLPR). For the TM wave incidence, a sharp transmitted peak with high quality factor can be observed. The EIT-like metamaterial is fabricated and measured. Good agreement is obta...

**Source: **Physics Letters A - September 10, 2019 **Category: **Physics **Source Type: **research

**Electron-phonon coupling in armchair silicene nanoribbons**

We report the effects of electron-phonon coupling on the charge density distribution of polarons in armchair nanoribbons of silicene by using an extended tight-binding model with lattice relaxation. The results show that the charge distribution in silicene nanoribbons is analogous to graphene and that the charge localization increases when the intensity of electron-phonon coupling also increases. We further show that silicene nanoribbons may be a conducting or semiconducting material, depending on both the width of the nanoribbon and the possibility of polaron formation. This contribution provides additional insight into t...

**Source: **Physics Letters A - September 10, 2019 **Category: **Physics **Source Type: **research

**Editors**

Publication date: 25 October 2019Source: Physics Letters A, Volume 383, Issue 30Author(s): (Source: Physics Letters A)

**Source: **Physics Letters A - September 10, 2019 **Category: **Physics **Source Type: **research

**Retraction notice to “Co-thickness and oxidation states effect on magnetic anisotropy in Co/MgO heterostructure” [Phys. Lett. A 383 (2019) 1977–1982]**

Publication date: 25 October 2019Source: Physics Letters A, Volume 383, Issue 30Author(s): S. Nazir (Source: Physics Letters A)

**Source: **Physics Letters A - September 10, 2019 **Category: **Physics **Source Type: **research

**Editors**

Publication date: 7 November 2019Source: Physics Letters A, Volume 383, Issue 31Author(s): (Source: Physics Letters A)

**Source: **Physics Letters A - September 10, 2019 **Category: **Physics **Source Type: **research

**Potential algebra approach to quantum mechanics with generalized uncertainty principle**

Publication date: Available online 6 September 2019Source: Physics Letters AAuthor(s): Satoshi Ohya, Pinaki RoyAbstractIn this note, we study the potential algebra for several models arising out of quantum mechanics with generalized uncertainty principle. We first show that the eigenvalue equation corresponding to the momentum-space HamiltonianH=−(1+βp2)ddp(1+βp2)ddp+g(g−1)β2p2−gβ, which is associated with some one-dimensional models with minimal length uncertainty, can be solved by the unitary representations of the Lie algebra su(2) if g∈{12,1,32,2,⋯}. We then apply this resul...

**Source: **Physics Letters A - September 7, 2019 **Category: **Physics **Source Type: **research

**First-principles studies of graphene antidot lattices on monolayer h-BN substrate**

Publication date: Available online 6 September 2019Source: Physics Letters AAuthor(s): Zeng-Xin Wei, Gui-Bin LiuAbstractThe structures and electronic structures of hetero bilayers composed of graphene antidot lattice (GAL) on monolayer h-BN substrate are studied in first-principles method. Bond lengths, interlayer distances, flatness, biaxial strain effects, and effects of translating the GAL layer are studied and analyzed in detail. Results show that introducing a monolayer BN substrate makes the zero-bandgap 5×5 GAL open a bandgap up to 28 meV, while it makes the semiconducting 6×6 GAL keep its low-energy ele...

**Source: **Physics Letters A - September 7, 2019 **Category: **Physics **Source Type: **research

**Electronic and structural properties of black phosphorene doped with Si, B and N**

Publication date: Available online 6 September 2019Source: Physics Letters AAuthor(s): Luiza Goulart, Liana Fernandes, Cláudia Lange, Jussane RossatoAbstractThe electronic and structural properties of substitutional and doped phosphorene with B, N and Si were studied using first principles calculations based on density functional theory. Moreover, electronic and structural properties of functionalized phosphorene slowly increasing the concentration of doping was investigated. Phosphorene strongly binds with doped functionalization; B doped phosphorene is the most stable configuration studied. Si doped phosphorene ma...

**Source: **Physics Letters A - September 7, 2019 **Category: **Physics **Source Type: **research

**Editors**

Publication date: 15 October 2019Source: Physics Letters A, Volume 383, Issue 29Author(s): (Source: Physics Letters A)

**Source: **Physics Letters A - September 7, 2019 **Category: **Physics **Source Type: **research

**Ordering induced transformation from high-entropy to Heusler CrVTiAl alloy**

Publication date: Available online 5 September 2019Source: Physics Letters AAuthor(s): Peiyu Cao, Hanyue Zhao, Shanshan Liu, Fuyang Tian, Yandong WangAbstractThe equimolar quaternary CrVTiAl is not only a potential spin filter, but also a light-weight high entropy alloy. The excellent performance strongly depends on the order degree. We use the ab initio calculation to investigate the structural, magnetic, elastic properties of CrVTiAl as a function of the order degree describing phase from full disorder A2 to DO3, B2, and L21 to full order Y-type (LiMgPdSn-type) structure. The Cr-Al bonding plays a key role in the local m...

**Source: **Physics Letters A - September 6, 2019 **Category: **Physics **Source Type: **research

**Vacancy-defect effect on the electronic and optical properties of Pmm2 BC2N: A first-principles study**

Publication date: Available online 5 September 2019Source: Physics Letters AAuthor(s): Xiong Li, Yan Zhu, Can HuangAbstractOrthorhombic-Pmm2-BC2N as a superhard photocatalyst simulates great interests in the researches of materials-design and application. To promote the studies of Pmm2 BC2N as a multifunctional material with both great hardness and good optical properties, we investigated the electronic and optical properties of Pmm2 BC2N with various vacancy-defects by the systematic first-principles density functional theory (DFT) calculations in this work. The absorption, refractivity, reflectivity, and photoconductivit...

**Source: **Physics Letters A - September 6, 2019 **Category: **Physics **Source Type: **research

**Controlling decoherence via PT-symmetric non-Hermitian open quantum systems**

Publication date: Available online 3 September 2019Source: Physics Letters AAuthor(s): Sanjib Dey, Aswathy Raj, Sandeep K. GoyalAbstractWe have studied the effect of a non-Hermitian Bosonic bath on the dynamics of a two-level spin system. The non-Hermitian Hamiltonian of the bath is chosen such that it converges to the harmonic oscillator Hamiltonian when the non-Hermiticity is switched off. We calculate the dynamics of the spin system and found that the non-Hermiticity can have positive as well as negative effects on the coherence of the system. However, the decoherence can be completely eliminated by choosing the non-Her...

**Source: **Physics Letters A - September 4, 2019 **Category: **Physics **Source Type: **research

**Discrete and generalized phase space techniques in critical quantum spin chains**

Publication date: Available online 3 September 2019Source: Physics Letters AAuthor(s): Zakaria Mzaouali, Steve Campbell, Morad El BazAbstractWe apply the Wigner function formalism from quantum optics via two approaches, Wootters' discrete Wigner function and the generalized Wigner function, to detect quantum phase transitions in critical spin-12 systems. We develop a general formula relating the phase space techniques and the thermodynamical quantities of spin models, which we apply to single, bipartite and multi-partite systems governed by the XY and the XXZ models. Our approach allows us to introduce a novel way to repre...

**Source: **Physics Letters A - September 4, 2019 **Category: **Physics **Source Type: **research

**Editors**

Publication date: 5 October 2019Source: Physics Letters A, Volume 383, Issue 28Author(s): (Source: Physics Letters A)

**Source: **Physics Letters A - September 4, 2019 **Category: **Physics **Source Type: **research

**The dynamics of two coupled Van der Pol oscillators with attractive and repulsive coupling**

Publication date: Available online 2 September 2019Source: Physics Letters AAuthor(s): Shiva Dixit, Amit Sharma, Manish Dev ShrimaliAbstractWe consider a variant of two coupled Van der Pol oscillators with both attractive and repulsive mean-field interactions. In the presence of attractive coupling, the system is in the complete synchrony, while repulsive coupling shows anti-synchronization state leading to suppression of oscillations with increasing interaction strength. The coupled system with both attractive and repulsive interactions shows competitive tendencies of being complete synchronization and anti-synchronizatio...

**Source: **Physics Letters A - September 3, 2019 **Category: **Physics **Source Type: **research

**Tunable double-beam optical bistability in an asymmetric double quantum-well system**

Publication date: Available online 30 August 2019Source: Physics Letters AAuthor(s): Yu-Yuan Chen, Ya-Nan Li, Ren-Gang Wan, Hong-Wei YanAbstractWe have proposed a scheme for double-beam optical bistability in a tunnel-coupled asymmetric double quantum-well driven by two optical fields circulating inside two independently unidirectional ring cavities. In contrast to the single-cavity case where single-photon saturated absorption and self Kerr-nonlinearity are dominant, the two-photon absorption and cross phase modulation can be enhanced via tunneling induced interference and have an important influence to the formation of b...

**Source: **Physics Letters A - September 1, 2019 **Category: **Physics **Source Type: **research

**Optical reflection properties for the interface associated with Chern insulator and chiral metamaterial**

Publication date: Available online 30 August 2019Source: Physics Letters AAuthor(s): Ran Zeng, Fangfang Chen, Chi Wang, Mingyue Zhang, Haozhen Li, Qiliang Li, Jun Ou, Yaping Yang, Shiyao ZhuAbstractBased on the topological nature of Chern insulator and magnetoelectric coupling of chiral metamaterial, we investigate the electrodynamics for the interface associated with the two media. The Fresnel coefficients of the interface between Chern insulator and chiral metamaterial, as well as the corresponding polarization rotation angles, are derived. The reflection characteristics of the linearly polarized incident wave at the int...

**Source: **Physics Letters A - September 1, 2019 **Category: **Physics **Source Type: **research

**Synchronization in a multiplex network of gene oscillators**

Publication date: Available online 29 August 2019Source: Physics Letters AAuthor(s): Abdul Jalil M. Khalaf, Fawaz E. Alsaadi, Fuad E. Alsaadi, Viet-Thanh Pham, Karthikeyan RajagopalAbstractStudy of the synchronization in the network of gene oscillator network has vital importance in understanding of rhythmicity of molecular and cellular activities. In this paper, we analyze a network of linearly coupled genetic oscillators in a multiplex structure. The coupling strength values are changed and the coupling range is considered to be fixed, but different in the two layers. The analyses are done in two cases of periodic and ch...

**Source: **Physics Letters A - August 31, 2019 **Category: **Physics **Source Type: **research

**Noether symmetry for fractional Hamiltonian system**

Publication date: Available online 29 August 2019Source: Physics Letters AAuthor(s): C.J. SongAbstractFractional Hamiltonian systems within combined Riemann-Liouville fractional order derivative and combined Caputo fractional order derivative are established. Then Noether quasi-symmetry and conserved quantity for the fractional Hamiltonian systems are presented. Thirdly, perturbation to Noether quasi-symmetry and adiabatic invariant are studied. Several special cases are discussed in each section. And finally, two applications, i.e., the fractional Lotka biochemical oscillator model and the fractional isotropic harmonic os...

**Source: **Physics Letters A - August 31, 2019 **Category: **Physics **Source Type: **research

**Evolution of breathers and interaction between high-order lump solutions and N-solitons (N → ∞) for Breaking Soliton system**

Publication date: Available online 29 August 2019Source: Physics Letters AAuthor(s): Wei TanAbstractBy employing the Hirota's bilinear method and different test functions, we investigate different forms of breather solitons and some new lump solutions of the (2+1)-dimensional Breaking Soliton system. During this process, some new nonlinear phenomena, such as degeneration of breather solitons, evolution of double breathers and emergence of lump solutions, are studied and shown. Besides, some interaction solutions between high-order lump solutions and N-soliton solutions (N→∞) are studied. We construct the existen...

**Source: **Physics Letters A - August 31, 2019 **Category: **Physics **Source Type: **research

**Enhanced acoustic localization in the two-dimensional phononic crystals with slit tube defect**

Publication date: Available online 29 August 2019Source: Physics Letters AAuthor(s): Xiao-peng Wang, Hui Sun, Tian-ning Chen, Xing-guo WangAbstractIn this paper, the acoustic localization characteristics of the two-dimensional phononic crystals with slit tube defect are investigated theoretically and experimentally. In contrast to the typical formation pattern of defect states, the proposed defect states are created by replacing a slotted tube in the center of perfect phononic crystal. Compared to perfect phononic crystal, the proposed structure can effectively localize waves of specific frequencies in the point defect and...

**Source: **Physics Letters A - August 31, 2019 **Category: **Physics **Source Type: **research