Showing papers in "Physics Letters A in 2020"

TL;DR: In this article, the authors discuss the state of the art of quantum multiparameter estimation, with a particular emphasis on its theoretical tools, on application to imaging problems, and on the possible avenues towards the next developments.

TL;DR: In this article, the Gaussian process regression model was used to find statistical correlations between thermal conductivity enhancement and physical parameters among various types of nanofluids, such as particle thermal conductivities, particle size, particle volume fraction, and temperature.

TL;DR: In this article, a review of advances made in seismic metamaterials and an inventory of which material parameters can be achieved and which cannot, from the effective medium theory perspective, are presented.

TL;DR: In this paper, the effects of hydrogen and hydroxyl passivation on the structure, electrical and optical properties of SiCNWs were investigated by analyzing the distribution of electronic states and the polarity of chemical bonds.

TL;DR: A considerable amount of research has focused on electrical spin current generation in different types of non-magnetic materials, such as ferromagnetic materials as discussed by the authors, which has applications in nonvolatile magnetic memories, miniature microwave oscillators, thermoelectric converters and Terahertz devices.

TL;DR: In this article, an extended (2+1)-dimensional coupled Burgers system in fluid mechanics is investigated, where the authors construct a hetero-Backlund transformation and a similarity reduction, depending on the coefficients in the system.

TL;DR: In this paper, the exchange coupling interactions of the equiatomic quaternary Heusler alloy CoFeTiSn, using the two methods: Monte Carlo simulations and the ab-initio method.

TL;DR: In this article, the adiabatic parameter dynamics and optical soliton cooling with having quadratic-cubic nonlinearity were obtained. And the soliton perturbation theory was implemented to picture the dynamical system.

TL;DR: In this article, a 2×2 array patch antenna is designed to create incident radiated signal towards the proposed harvester structure, which can be used in various applications such as energy harvesting, incident wave tracing, crack detection, spy device detection, medical imaging, and so on.

TL;DR: In this article, Nikiforov-Uvarov (NU) and supersymmetric quantum mechanics (SUSYQM) methods were used to obtain the energy spectrum for any l-state and the corresponding radial wave functions in terms of the hypergeometric functions.

TL;DR: In this article, the authors investigated the steady state properties arising from the open system dynamics described by a memoryless (Markovian) quantum collision model, corresponding to a master equation in the ultra-strong coupling regime.

TL;DR: The validity of the Hilbert-Schmidt inner product, which becomes the squared overlap for pure states, as a positive definite and symmetric kernel is explicitly shown, thereby connecting the quantum binary classifier and kernel methods.

TL;DR: In this paper, a bilinear form for an extended ( 2 + 1 ) -dimensional generalized breaking soliton equation, namely, a ( 3 + 1 ), is presented, through using the Hirota direct method, and a type of new interaction solutions in terms of a new combination of quadratic function, trigonometric function and exponential function is generated.

TL;DR: The non-Hermitian skin effect arises in a non-reciprocal tight binding lattice with open edges as mentioned in this paper, where not only topological states but also bulk states are localized around the edges of the non-hermitian system.

TL;DR: A surface enhanced Raman scattering (SERS) substrate, Au nanodisk and Au film coupling structure with two surface plasmons resonant wavelengths is proposed in this article, and the results show that the substrate is capable of performing SERS detection at two wavelengths, and has good SERS characteristics at both wavelengths.

TL;DR: The wave propagation in micro structured solids is described by conformable time fractional strain wave equation and should be able to account for several scales of micro-structure (G ′ G 2 ) -expansion method has been used to propagate the different types of solutions like hyperbolic functions, trigonometric functions and rational functional solutions All the solutions are listed with their existence criterion on the parameters as mentioned in this paper.

TL;DR: In this article, the authors performed simulations of CoCrCuFeNi high-entropy alloy at various temperatures under uniaxial tension and found that the elastic modulus and ultimate tensile strength increase with temperature decreasing.

TL;DR: In this article, the semi-inverse variational principle was used to retrieve a bright 1-soliton solution to the perturbed Kudryashov's equation, where the perturbation terms appeared with maximum intensity and additionally higher order dispersion effects were included.

TL;DR: In this article, the adsorption and diffusion of H2, H2S, NH3, CO and H2O molecules on two-dimensional (2D) MoO3 layer were studied via density functional theory (DFT) calculations.

TL;DR: In this paper, a Lie-symmetric analysis of the Chen-Lee-Liu model is used to obtain optical solitons from a system of ordinary differential equations.

TL;DR: Detailed account of how HHL is exploited in different quantum machine learning (QML) models, and how it provides the desired quantum speedup in all these models is provided.

TL;DR: Zhang et al. as mentioned in this paper proposed a reputation-based strategy persistence mechanism, in which the increment of current reputation is determined by the persistence of last strategy, and introduced a parameter α to illustrate the impact of strategy persistence on reputation variation.

TL;DR: In this article, the authors explore an alternative method for discovering appropriate pulse sequences based on deep reinforcement learning algorithms and by imposing that the control laser can be only either on or off instead of being continuously amplitude-modulated.

TL;DR: In this paper, the authors constructed the PDM creation and annihilation operators for the position-dependent mass (PDM) oscillator via two different approaches, via von Roos PDM Hamiltonian and showed that the commutation relation between the creation A and annihilation A operators, [ A ˆ, A ǫ + ] = 1 ⇔ A Ã − 1 / 2 = A ´ + A´+ A´ + 1/2, not only offers a unique PDM-Hamiltonian H ´ 1 but also suggests a PDM deformation

TL;DR: In this article, two types of BC6N are found based on the BN bonds: an even number of π-bonds emerges indicating an aromatic structure and a large direct bandgap appears, while in the absence of BN-bond, an anti-aromatic structure with an odd number of bn bonds is found resulting a direct small bandgap.

TL;DR: In this paper, the irreversibility and heat transfer of hybrid nanomaterial within a permeable medium was scrutinized by means of a stream function formulation and the results were obtained using CVFEM and its accuracy was check by comparing with previous article.

TL;DR: In this paper, the authors examined a fractional version of the discrete nonlinear Schrodinger (dnls) equation, where the usual discrete laplacian is replaced by fractional discrete Laplacians, leading to the replacement of the usual nearest neighbor interaction to a long-range intersite coupling that decreases asymptotically as a power law.

TL;DR: In this paper, a (3 + 1 )-dimensional Boiti-Leon-Manna-Pempinelli (BLMP) equation with time-dependent coefficients was investigated.

TL;DR: In this paper, first-principle calculations were performed to investigate the adsorption behavior of NO2 gas on the pristine graphitic carbon nitride (gCN) and transition metals (TM)-embedded gCN systems (TM = Co, Rh, and Ir elements) in order to explore the sensing capabilities of gCN system as toxic gas sensor.

TL;DR: In this paper, a unified Riccati equation expansion scheme as well as extended auxiliary equation method was used to obtain bright, dark and singular solitons in magneto-optic waveguides.