Abstract We study the asymptotic decay of the Friedel density oscillations induced by an open boundary in a one-dimensional chain of lattice fermions with a short-range two-particle interaction. From Tomonaga-Luttinger liquid theory it is known that the decay follows a power law, with an interaction dependent exponent, which, for repulsive interactions, is larger than the noninteracting value − 1.

Abstract In the one-dimensional Bose-Hubbard model with on-site and nearest-neighbor interactions, a gapped phase characterized by an exotic non-local order parameter emerges, the Haldane insulator. Bose-Hubbard models with cavity-mediated global range interactions display phase diagrams, which are very similar to those with nearest-neighbor repulsive interactions, but the Haldane phase remains elusive

Abstract Herein, we report our density functional theory calculations for structure, electronic, thermodynamic and mechanical properties of MBiO3 (M = Rb, Cs, Tl), compounds of perovskites oxide family. Exchange-correlation potential was treated with generalized gradient and local density approximations. From available ionic data, the tolerance factors and lattice constants were calculated. The values

Abstract The electronic, magnetic and optical properties of dual doped bilayer graphene (BLG), containing the impurity of Se in one monolayer, and X (= Ga, P, S) in other one, were calculated by DFT approach. Given the band structures and DOS diagrams, for the Se-P doped BLG the half-metallic, for the case of Se-Ga the metallic, and for the Se-S doped BLG the semiconductor behavior was observed. These

Abstract With the increasing requirement of metamaterials, integration and intellectualization have become the trends in order to enhance the manipulation efficiency of physical fields. Therefore, multiphysical functions and metamaterials have been proposed intensively. Meanwhile, the higher requirement of materials and structures is also put forward. In this work, by applying a shell and a dipole

Abstract The electronic, structural, mechanical, lattice dynamics and the electronic transport properties of ACuO2(A = K, Rb and Cs) are investigated using density functional theory. The calculated elastic constants and their related elastic moduli, phonon spectra and electronic transport properties of these compounds are reported here for the first time. The predicted structural parameters are in

Abstract The structural, mechanical and thermal properties of perovskite BaZrS3 have been investigated in terms of first-principles plane-wave pseudopotential method. Four structures such as GdFeO3-type, BaNiO3-type, NH4CdCl3-type and CaTiO3-type structures are considered. The results show that the calculated lattice structural results of perovskite BaZrS3 with the GdFeO3-type phase are in good agreement

Abstract We discuss a two-dimensional model that leads to a phase diagram which reproduces at least qualitatively that of a pure substance. It is known that a spring between two atoms is due to a bond created by the interaction between the electrons of both atoms. Consequently a variation of the quantum state of the electrons involved in the bond can modify the elastic force constant of the spring

Abstract The thermal and electrical resistivity of f-electron cubic intermetallic metals with well localized and stable stable f-shells are calculated as functions of the temperature. The interaction of the conduction electron with both acoustic and optical phonons as well as the exchange s–f interaction with the crystal field presence are taken into account by applying the Matthiessen rule on the

Abstract The physical properties of Fe2CoAl (FCA) Heusler alloy are systematically investigated using the first-principles calculations within generalized gradient approximation (GGA) and GGA+U. The influence of atomic ordering with respect to the Wyckoff sites on the phase stability, magnetism and half metallicity in both the conventional L21 and XA phases of FCA is focused in this study. Various

Abstract Considering the impact of reputation on social benefits of people in reality, we introduce the reputation-based payoff transfer mechanism to investigate cooperative behaviors on the lattice in the process of public goods game (PGG). Here individual reputation is quantified by score rules and players are ranked based on reputation scores. Payoffs can be transferred from low-ranking groups to

Abstract Identifying modular properties of multiplex networks presents additional subtleties to the already corresponding difficult problem in single layer networks. One most evident issue is the presence of conflicting module partitions, when two or more layers have very clear community structure that differ from one another. Based on the well known Newman-Girvan method, a framework (MultiNG) to reach

Abstract We develop a general formalism for the magnetic oscillations (MO) in two dimensional (2D) systems. We consider general 2D Landau levels, which may depend on other variable or indices, besides the perpendicular magnetic field. In the ground state, we obtain expressions for the MO phase and amplitude. From this we use a Fourier expansion to write the MO, with the first term being a sawtooth

Abstract Present study endeavors to analyze the role of Gaussian white noise and fluctuating confinement potential on time-average excitation rate (TAER) of impurity doped quantum dot (QD). The TAER profiles are exhaustively monitored as a number of physical quantities are varied over a range with and without noise. Application of noise to the system takes place in two different pathways known as ‘additive’

Abstract We study numerically the ordering kinetics in a two-dimensional Ising model with random coupling where the fraction of antiferromagnetic links a can be gradually tuned. We show that, upon increasing such fraction, the behavior changes in a radical way. Small a does not prevent the system from a complete ordering, but this occurs in an extremely (logarithmically) slow manner. However, larger

Abstract We study the survival of the current induced initially by applying a twist at the boundary of a chain of hard-core bosons (HCBs), subject to a periodic double δ-function kicks in the staggered on-site potential. We study the current flow and the work-done on the system at the long-time limit as a function of the driving frequency. Like a recent observation in the HCB chain with single δ-function

Abstract We investigate how entangled states can be created by considering collections of point-particles arranged at different spatial configurations, i.e., Fock states with spatial constraints. This type of states can be realized in Hubbard chains of spinless hard-core bosons, at different fillings, which have gapped energy spectrum with a highly degenerate ground state. We calculate the bipartite

Abstract We investigate the roles of both fermion-fermion interactions and impurities in pinning down the fates of fermion velocities in the line-nodal superconductors. Distinct sorts of four-fermion interactions and impurities as well as competitions among them are unbiasedly taken into account by adopting renormalization group approach. We firstly derive the coupled evolutions of all interaction

Abstract Mass-dependencies of a number of bound state properties are investigated in some light two-electron exitonic complexes (or clusters) Z+e−e−, where me ≤ mZ ≤ 2me. These exitonic complexes (or model ions) play a great role in modern solid state physics, since such complexes describe optical absorption in a number of semiconductors. We also derived and tested a number of accurate mass-interpolation

Abstract In this article, we have explored the exchange coupled behavior of MnFe2O4/α-Fe2O3 core-shell based nanocomposite systems. Four nanocomposite samples were prepared by varying weight percentage of α-Fe2O3 with the generic formula (1 − x) MnFe2O4/x α-Fe2O3 (x = 0.15, 0.30, 0.45 and 0.60). The existence of single spinel cubic phase of MnFe2O4 along with rhombohedral phase of α-Fe2O3 was verified

Abstract Aluminum zig-zag thin film was coated on the glass substrate by the oblique angle deposition (OAD) method. X-ray diffraction (XRD) revealed the formation of cubic phase with the peak in the (111) plane. The field emission scanning electron microscopy (FESEM) analysis used to estimate the films thickness, columns magnitude and its shape. The unpolarized light absorption spectrum of the zig-zag

Abstract Competing orders in condensed matter give rise to the emergence of fascinating, new phenomena. Here, we investigate the competition between superconductivity and charge density wave in the context of layered-metallic compounds, transition metal dichalcogenides, in which the superconducting state is usually suppressed by the charge density wave. We show, using real-space self-consistent Bogoliubov-de

Abstract Simulations of systems with quenched disorder are extremely demanding, suffering from the combined effect of slow relaxation and the need of performing the disorder average. As a consequence, new algorithms and improved implementations in combination with alternative and even purpose-built hardware are often instrumental for conducting meaningful studies of such systems. The ensuing demands

Abstract A long-range interacting spin chain placed in a staggered magnetic field can exhibit either first order phase transition or second order phase transition depending on the magnetic field intensity. The first order phase transition of this model is known to be accompanied with the temperature jump phenomenon in the microcanonical ensemble, while this anomalous temperature jump phenomenon can

Abstract The effects of symmetric helical interaction which is called the Kaplan, Shekhtman, Entin-Wohlman, and Aharony (KSEA) interaction on the ground-state properties of three kinds of spin chains in a transverse field have been studied by means of correlation functions and chiral order parameter. We find that the anisotropic transition of XY chain in a transverse field (XY TF) disappears because

Abstract Left-handedness signifies negative permittivity (εr) and permeability (μr) in the same frequency band. The εr and μr are evaluated in a quantized composite right-left handed transmission line (CRLH-TL), and the frequency band for left-handedness is also valuated in the balanced resonance (LrCl = LlCr) and unbalanced resonance (LlCr ≠ LrCl) cases in the displaced squeezed Fock state. The results

Abstract We study the spin transport in a zigzag silicene nanoribbon (ZSNR) ferromagnetic junction with different even(odd)-chain widths and a perpendicular electric field on its drain electrode. By using the tight-binding lattice model and Keldysh Green’s function method, we calculate the spin-dependent transverse conductance and find that the spin switching effect always exists in the system regardless

Abstract In models of hopping disorder in the absence of external fields and at the band center, the electrons are less localized in space than the standard exponential Anderson localization. A signature of this anomalous localization is the square root dependence of the logarithmic average of the conductance on the system length, in contrast to the linear length dependence for Anderson localized systems

Abstract In ergodic physical systems, time-averaged quantities converge (for large times) to their ensemble-averaged values. Large deviation theory describes rare events where these time averages differ significantly from the corresponding ensemble averages. It allows estimation of the probabilities of these events, and their mechanisms. This theory has been applied to a range of physical systems,

Abstract We investigate the evolution of competing languages, a subject where much previous literature suggests that the outcome is always the domination of one language over all the others. Since coexistence of languages is observed in reality, we here revisit the question of language competition, with an emphasis on uncovering the ways in which coexistence might emerge. We find that this emergence

Abstract In this paper, we explore the inducement of synchronization by transient uncoupling observed in unidirectionally coupled chaotic systems with inherent frequency parameters. The emergence of desyncronization with increase in frequency factor for fixed values of coupling strength and the suppression of stable synchronization to lower values of coupling strength in the presence of frequency factors

Abstract Using the field theoretic renormalization group technique the simultaneous influence of compressibility and finite time correlations of the non-solenoidal Gaussian velocity field on the advection of a passive scalar field is studied within the generalized Kraichnan model up to the second-order approximation in the corresponding perturbative expansion. The renormalization of the model is performed

Abstract We present the influence of the deGennes extrapolation length on the vortex matter in a two band superconducting square with a central defect. This is determined by considering different values of the de Gennes extrapolation length b on the lateral surface of the sample. Our investigation was carried out by solving the two-dimensional time-dependent Ginzburg-Landau equations for a two-band

Abstract We study the density of states (DOS) in band gaps of ideal and disordered three-dimensional photonic crystals of finite size. The ideal crystal is a diamond lattice of resonant point scatterers (atoms) whereas the disordered one is obtained from it by displacing the scatterers by random distances in random directions. We find that DOS inside a band gap of the ideal crystal decreases as the

Abstract A numerical model is developed to calculate characteristics of impurity transport (including non-classical regimes) in double porous media in the presence of colloids. A governing equation set in the space-time representation is formulated basing on earlier proposed by one of the authors (L. M.) model. Analytical expressions for transport characteristics in limiting time intervals in the one-dimensional

Abstract This article presents a Hamiltonian architecture based on vertex types and empires for demonstrating the emergence of aperiodic order in one dimension by a suitable prescription for breaking translation symmetry. At the outset, the paper presents different algorithmic, geometrical, and algebraic methods of constructing empires of vertex configurations of a given lattice. These empires have

Abstract We use a tensor network strong-disorder renormalization group (tSDRG) method to study spin-1 random Heisenberg antiferromagnetic chains. The ground state of the clean spin-1 Heisenberg chain with uniform nearest-neighbor couplings is a gapped phase known as the Haldane phase. Here we consider disordered chains with random couplings, in which the Haldane gap closes in the strong disorder regime

Abstract A theoretical analysis is reported for the spin waves in ferromagnetically-ordered magnonic crystals consisting of lateral periodic arrays of composite nanowires. The structure of each nanowire is a vertically-developed multilayer built up according to a quasiperiodic Fibonacci sequence. Each nanowire is separated by a non-magnetic spacer in either direction. The quasiperiodicity in these

Abstract In this paper, we have studied the three dimensional Coulomb glass lattice model at half-filling using Monte Carlo Simulations. Annealing of the system shows a second-order transition from paramagnetic to charge-ordered phase for zero as well as small disorders. We have also calculated the critical exponents and transition temperature using a finite sizing scaling approach. The Monte Carlo

Abstract By using the real-space Green-Kubo formalism we study numerically the electron transport properties of low-fluorinated graphene. At low temperatures the diffuse transport regime is expected to be prevalent, and we found a pronounced electron-hole asymmetry in electrical conductivity as a result of quasi-resonant scattering on the localized states. For the finite temperatures in the variable-range

Abstract We study 1 isolated or 2 neighboring Mn impurities, as well as 1 Mn and 1, 2, or 3 Mg ions as substitutional impurities for Ga in zinc-blende and wurtzite supercells of GaN by means of density functional calculations. Taking into account the electron correlation in the local spin density approximation with explicit correction of the Hubbard term (the LSDA+U method) and full lattice relaxation

Abstract We consider a Dice model with Dirac cones intersected by a topologically flat band at the charge neutrality point and analyze the inelastic scattering of massless pseudospin-1 particles on a circular, gate-defined, oscillating barrier. Focusing on the resonant scattering regime at small energy of the incident wave, we calculate the reflection and transmission coefficients and derive explicit

Abstract We discuss the ferromagnetic phase of the planar Kondo lattice model using the bond fermion technique. For sufficiently small Kondo exchange we find a weakly ferromagnetic phase already for the weakly doped Kondo insulator. We present the phase diagram of the model and its quasiparticle band structure in the different phases. Graphical abstract

Abstract We introduce a numerical method for computing conductivity via the Kubo formula for incommensurate 2D bilayer heterostructures using a tight-binding framework. We begin by deriving the momentum space formulation and Kubo formula from the real space tight-binding model using the appropriate Bloch transformation operator. We further discuss the resulting algorithm along with its convergence

Abstract The possibilities of formation and detection of the electromagnetic soliton-like wave in superlattices based on semi-Dirac crystals have been considered. The field of soliton-like wave obeys the d’Alembert equation which takes into account the current induced in superlattice by this wave. Resulting equation has the form of nonlinear Klein-Gordon equation. Some approximate methods of finding

Abstract Using the model of an elastic continuum, precise analytical solutions of the equations of motion are established and a theory of the spectrum and components of the displacement field of acoustic phonons is developed for a two-well resonant-tunneling nanostructure with AlN – quantum barriers and GaN∕AlxGa1−xN – quantum wells. For the experimentally realised nanostructure – the active zone of

Abstract We discuss the calculation of the refractive index by means of the ab initio scalar dielectric function and point out its inherent limitations. To overcome these, we start from the recently proposed fundamental, microscopic wave equation in materials in terms of the frequency- and wavevector-dependent dielectric tensor, and investigate under which conditions the standard treatment can be justified

Abstract This paper presents results of broadband dielectric spectroscopy studies in the composite system for which particularly strong interactions between polyvinylidene difluoride (PVDF: ferroelectric polymer, TC = 453−473 K) matrix and barium strontium titanate (BST) ferroelectric micro-particles can be expected. For PVDF the super-Arrhenius (SA) dynamics, associated with segmental motions freezing

Segmentation is a standard method of data analysis to identify change-points dividing a nonstationary time series into homogeneous segments. However, for long-range fractal correlated series, most of the segmentation techniques detect spurious change-points which are simply due to the heterogeneities induced by the correlations and not to real nonstationarities. To avoid this oversegmentation, we present

We use agent-based modeling to investigate the effect of conservatism and partisanship on the efficiency with which large populations solve the density classification task - a paradigmatic problem for information aggregation and consensus building. We find that conservative agents enhance the populations' ability to efficiently solve the density classification task despite large levels of noise in

We show that the transitions which occur between close orders of synchronization in the cardio-respiratory system are mainly due to modulation of the cardiac and respiratory processes by low-frequency components. The experimental evidence is derived from recordings on healthy subjects at rest and during exercise. Exercise acts as a perturbation of the system that alters the mean cardiac and respiratory