A theoretical and experimental study of acoustic wave coupling in strongly coupled microcavities is presented. Here, we propose an acoustic analogy of Rabi rotations in a system based on porous silicon. We realize a structure consisting of two coupled acoustics microcavities fabricated by electrochemical etching from doped p-type (100) silicon wafers. We measure the acoustic transmission spectra in

This article introduces a method for generating spin-polarized photocurrent through light radiation on zigzag MoS2 nanoribbons. In this regard, we investigate local manipulation by exposing edge states to (i) a ferromagnetic, (ii) an antiferromagnetic exchange field, (iii) a parallel and an antiparallel electric field. These local manipulations at the edges with intrinsic spin-orbit interaction could

The rate of energy loss of the non-equilibrium electrons and their non-ohmic mobility characteristics have been analyzed here for a degenerate ensemble of two dimensional electron gas in a well of compound semiconductor, taking due account of some of the low temperature features. In place of the Fermi Dirac distribution function, a well-tested alternative form of the distribution function has been

Hollow copper oxide spheres with a diameter of 1.5–2 μm were prepared by hydrothermal reaction at 170 °C for 10 h in one step. The product was characterized by SEM, XRD, XPS, and EDX. We deduced the possible formation mechanism of the morphology through its nucleation process. Ostwald ripening process and NH3 produced by urea should be the main reason for the formation of hollow structure. We also

The successful fabrication of the lateral heterostructures (LHSs) open a promising avenue for the band structure engineering. Here, we design novel (C3N)2(C3B)2 LHSs integrating monolayer C3N and C3B along different directions and predict their electronic properties based on the density functional theory. It is found that (C3N)2(C3B)2 LHSs stitched semi-infinite monolayers along both armchair and zigzag

The performance and commercialization of dye sensitized solar cells is very much dependent on cost effective and robust catalyst. In this study, polyaniline (PANi) nano-rods have been synthesized and the effect of tungsten disulfite (WS2) nanosheets has been investigated for the catalytic and electronic properties of polyaniline. Various concentrations of WS2 nanosheets i.e., 1 wt%, 2 wt%, 5 wt% and

We study the ballistic transport of a two-dimensional (2D) electron gas with anisotropic semi-Dirac (SD) band structure modulated by magnetic and electrical barriers. The magnetic barriers are induced by an inhomogeneous magnetic field, which can form a parallel (P) or antiparallel (AP) magnetic configuration. Using the transfer matrix approach, we calculate the transport-direction-dependent transmission

Electron phonon coupling in (quasi)-two-dimensional structures within the first order theory is strongly constrained by symmetry, and the resulting deficiencies are manifested in a number of striking phenomena: electronic system dynamically decoupled from lattice, absence of totally symmetric phonons, Jahn-Teller theorem violation (with spontaneous symmetry breaking), insufficiency of the Kohn singularity

Owing to unique electromagnetic properties and support of surface plasmon polariton at terahertz frequency, graphene has gained momentum for the realization of the graphene plasmonic THz antenna. The appropriate selection of substrate for graphene THz antennas can provide an effective performance to the antenna. In this paper, we investigated the performance of graphene THz antennas over silicon-based

In this paper, we study the effect of geometric structure of gradient Al component AlxGa1-xN nanowires on their optical response. Based on the finite element simulation software Comsol Multiphysics, we systematically studied the optical properties of different geometric parameters of base radius (R), axis inclination (θ) and Angle of incident light (AOI). In the radial mode, we investigate the optical

The effect of non-uniform magnetic fields on the Ising-Heisenberg chain of a heterotrimetallic coordination compound Fe − Mn − Cu, modeling a magnetic impurity on one dimer is studied. This impurity is configured by imposing non-uniform magnetic fields on each sites of j−th interstitial ionic dimer Mn2+ −Cu2+ of the chain model. The quantum coherence and pairwise entanglement between spin-1/2 magnetic

Recently, how to induce magnetism for two-dimensional materials have become one of research hot topics. Here, we study geometrical stability and magneto-electronic properties for antimonene nanoribbons doped with low-concentration transition metal(TM) atom (Mn, Fe, Cr and Co). It is found that these structures are stable by the formation energy calculation and molecular dynamics simulation. In particular

We study the sub-gap spectrum and the transport properties of a double quantum dot coupled to metallic and superconducting leads. The coupling of both quantum dots to the superconducting lead induces a non-local pairing in both quantum dots by the Andreev reflection processes. Additionally, we obtain two channels of Cooper pair tunneling into a superconducting lead. In such a system, the direct tunneling

Based on density-functional theory, the catalytic property for hydrogen evolution reaction (HER) of square phase Janus MoSSe monolayer is systematically investigated. Similar to 2H-phase transition metal dichalcogenides, the basal plane of pristine 1S-MX2 and 1S-MXY (M: Mo; X/Y: S/Se) are catalytically inert. By introducing vacancy defects, the catalytic performance of the basal plane can be activated

MoS2-based two-dimensional (2D) heterostructure photocatalysts have attracted increasing attention due to their prominent photocatalytic performance, but still suffer from weak visible light absorption and low solar-to-hydrogen conversion efficiency. Herein, we comprehensively investigate the structural and electronic properties of 2D MoS2/SnS heterostructure using first-principles calculations. It

Wavelength-selective emitter is a critical component in thermophotovoltaic (TPV) systems. How to evaluate and further enhance TPV efficiency for different PV cells by designing selective emitter is still needed for realistic applications. Hence, the impact of the nanoparticle-based spectrally selective emitter on the TPV efficiency was investigated in this work. The nanoparticle material, radius, volume

The electronic and adsorption properties of chevron and cove-edged graphene nanoribbons (GNRs) are studied using first principles calculations. The positive binding and adsorption energies in conjunction with the positive infrared frequencies insure the stability of the considered GNRs. The results show that the binding strength of coved-edged GNRs is higher than that of chevron ones because the morphology

A new one-dimensional photonic crystal (1DPC) containing moderately doped silicon (m-Si) semiconductor is proposed and its tunable properties are theoretically investigated. The tunable complex permittivity of m-Si with temperature is the central idea that makes the 1DPC thermally tunable. The 1DPC systems such as (m-Si/SiO2)12 and defective (m-Si/SiO2)6D(m-Si/SiO2)6 are examined in the spectral range

We study exchange interaction between two magnetic impurities, i.e. (the Ruderman-Kittel-Kasuya-Yosida [RKKY]), in doped biased bilayer graphene by directly computing Green’s function within full band method. Tight binding model Hamiltonian in the presence of magnetic long range ordering has been applied to describe electron dynamics. RKKY interaction as a function of distance between localized moments

We determined the lateral mobility of photocarriers and activation energy of the photocurrent (PC) in stacked InAs quantum dot (QD) layers with ultrafast carrier relaxation times and 1.5-μm band absorption. Lateral mobility is one of the important parameters in the application of QD layers to photoconductive antennas operating with 1.5-μm gating light for terahertz (THz) wave detection. The activation

Influence of Γ-X crossover due to applied hydrostatic pressure on exciton dynamics has been studied in symmetric GaAs/Al0.3Ga0.7As double quantum wells using variation technique and effective mass approximation. The effect of Γ-X crossover is significant in narrow wells irrespective of the coupling, type of excitons and nature of confinement. The stability of both direct and indirect excitons has been

In this work, we present a novel ultra-thin 4H–SiC junctionless tied double gate field effect (DG-JLFET) transistors with a symmetrical dual p+ layer (S-D-P DG-JLFET) and the proposed structure compared with a conventional junctionless tied double gate field effect structure (DG-JLFET). By changing the depletion region in the proposed structure and due to the symmetrical dual p+ layer, off-current

To use the Full-Potential Linearized Augmented Plane Wave (FP-LAPW) method in density functional theory (DFT), we have calculated the electronic structure and linear optical properties of 2D Transition metal dichalcogenides (TMDs), MoX2 (X = S, Se, Te). The predicted optical gap of MoX2 monolayers are in good agreement with the available experimental and theoretical data. The real and imaginary parts

A study about magnetic behavior of 3×3 arrays, constituted by Ni squared pillars (SPs), is presented. Micromagnetic simulations using the OOMMF package reveal hysteresis loops that depend on the inter-pillar distance, d. Solid SPs with high L = 120 nm, lateral dimensions D (30 nm and 60 nm) and face to face distance d (20 nm and 30 nm) were used. Hollow pillars with rectangular cavity a (12 nm and

The GaN:Mn nanostructure was prepared using direct current (DC) arc discharge plasma method. No catalysts or templates are involved in the experiment. The test of energy dispersive x-ray spectroscopy (EDXS) detected the signals of Ga, N, Mn, and the Mn signal strength is slightly stronger with the increasing Mn content. The X-ray diffraction peak (XRD) is sharp, and there is a clear XRD peak shift

Using the effective mass and parabolic band approximations, we investigated the position-dependent effective mass and non-resonant intense laser field effects on the first and third-order corrections of the absorption and relative changes of the refraction index coefficients for intersubband transition in Razavy-like quantum wells. Calculations have been extended to the spherical Razavy-like quantum

We investigate the electronic and optical properties of zinc iodide (ZnI2) under the effect of the biaxial strains. It has been emphasized that ZnI2 monolayer is stable based on the molecular dynamics simulations, phonon dispersion curve and binding energy calculations. In the equilibrium state, the results revealed that the ZnI2 monolayer is a semiconductor with the indirect bandgap value of 2.018 eV/2

We study the electronic properties of multilayer armchair phosphorene nanoribbons (APNRs) modulated by certain strains. The band structure is calculated by solving the corresponding differential Schrödinger equation, and the density of states (DOS) is obtained combining the Green's function method. It is found that the certain strain has similar effects on different layer APNRs. The vertical tensile

In this work, the geometrical structure, stability, electronic and optical properties of the GaS/AlN van der Waals heterostructure have been explored based on first principles calculations considering the effect of vertical strain, in-plane biaxial strain and the electric field. It is demonstrated that, the GaS/AlN van der Waals heterostructure possesses an intrinsic typical type-II band alignment

In this work, wideband graphene-based near-infrared solar absorber with rectangular sawtooth at the outer edge of the C-shaped structure is proposed. The C-shaped with rectangular sawtooth metasurface provides better absorption in the near-infrared region (NIR) from 0.81μm to 1.07μm. The metallic resonators made up of tungsten and graphene monolayer helps to improve the absorption in the gaps of structure

We identify theoretically the possibility to determine the Rashba spin-orbit coupling strength in InSb nanowire quantum dots by measuring the magnetic susceptibility of the two-electron system in a double quantum dot. To realistically describe such a system, we study the role of finite temperature and the interaction of the double quantum dot spins with the nuclear environment. Magnetic susceptibility

In this work, we study thoroughly influences of cooling rate on the formation of two-dimensional (2D) germanene via molecular dynamics simulation using atomistic models composed of 104 atomic Ge atoms with the Stillinger - Weber potential. This influence is studied through the changes in the thermodynamic and structural properties of the model. We find that the relatively good quality amorphous germanene

A popular evidence of the existence of Majorana bound states (MBS) is a quantized zero-bias conductance peak (ZBCP) which is robust to scattering by impurities, a consequence of its topological protection. In this work we examine the stability of this MBS induced ZBCP in a metal-superconductor junction in the vicinity of a spin flipper. We analytically calculate the differential charge conductance

Spin Seebeck effect has been mostly explored in bulk magnetic materials, but the efficiency is not large enough for device application. Recently, we have found that the 2D ferromagnetic CrPbTe3 layer has rather a high Curie temperature of 110 K. Thus, we have investigated the spin dependent Seebeck effect using the Boltzmann transport approach. We have found the largest carrier mobility and relaxation

Horizontally ordered TiO2 nanotubes with different wall thicknesses were fabricated by three processes: electrospinning, pulse laser deposition and annealing. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy X-ray photoelectron spectroscopy (XPS) and ultraviolet–visible (UV–vis) absorption were used to characterize the morphology, crystal structure, surface

We present a study of the electronic and optical properties of carriers in GaAs/AlxGa1-xAs quantum ring (QR) as a function of the aluminum concentration (x) in the barrier and the ring height (hM). We calculated the wavefunctions and the energies of the electrons and holes using the effective mass approximation. We found that the variation of x or hM, leads to a crossover, and consequently the mixing

We have investigated the electronic and optical properties of bilayer AA′ stacked hexagonal Boron Nitride (h-BN) with B and N vacancy defects by using density functional theory (DFT). The two single layers of h-BN are stacked in layers to form the h-BN bilayer. The inter-layer interaction between the two layers of h-BN bilayer is governed by the introduction of van der Waals potential (vdW). The calculated

In recent years, the two-dimensional ZnO has been emerged as promising material for thermoelectric applications due to its low-cost and non-toxic behavior. In this article, we report the thermoelectric response of two monolayers of ZnO derived from polar (0001) surface and non-polar (112‾0) surface in the framework of combined density functional theory and Boltzmann transport theory. The thermoelectric

The isomers of B12N12 nanocage with eighteen (Hn18) and sixteen (Hn16) homonuclear bonds have been proposed to capture/degrade the insecticide imidacloprid (Im). Calculations based on Density Functional Theory (DFT) were performed to analyze the interactions and electronic properties of the B12N12-Im, Hn18-Im, and Hn16-Im systems at HSEh1PBE/6-311G(d,p) level of theory. The large values of adsorption

A new-style two-dimensional C3N monolayer, unlike the honeycomb C3N monolayer, is proposed as a gas sensor, capture and separation. By using the first-principles method, the adsorption behaviors of gas molecules (NH3, H2S, SO2, CO, CO2, NO, NO2, CH4, HCN, N2, H2 and O2) on the C3N monolayer were investigated, and the charge density difference, density of state and Hirshfeld charge of those adsorption

All-optical encoders with high speed are required to achieve efficient information conversion in the field of ultra-fast information encoding, which can break the bottleneck of photoelectric conversion delay in traditional optical encoders and improve a tunable bandwidth of up to THz range. The modifiable advantages of light path about all-optical encoder can be widely used in modern high-precision

In this work, the electrical properties of bilayer Antimonene with different stacking orders are studied. Density functional theory with van der Waals (vdW) correction is used to investigate the electrical performances. Two configurations demonstrate considerable bandgaps, whereas, the bandgaps are close to zero for other structures. The in-plane biaxial strain is applied to modify the electrical properties

The theoretical investigation of linear and third-order nonlinear absorption coefficients and refractive index changes in the cylindrical quantum dot with two models of confinement potentials in axial direction, namely, modified Pöschl-Teller and Morse potentials, and parabolic potential in radial direction, have been considered in the presence of external electric and magnetic fields. The selection

In this paper, the exchange field effects are theoretically investigated to generate the mass in ferromagnetic/topological crystalline insulator SnTe heterostructure. The Dirac theory of exchange field-induced system predicts the anisotropic gaps in both low- and high-energy regimes. At small momenta, the group velocity is anisotropic, coinciding with orientation-dependent Fermi velocities, however;

We study the wake effect in a graphene-Al2O3-graphene composite system induced by an external charged particle moving parallel to it by using the dynamic polarization function of graphene within the random phase approximation for its π electrons described as Dirac's fermions and by using a local dielectric function for the bulk sapphire (aluminum oxide, Al2O3). We explore the effects of variation of

Black phosphorus (BP), as a newly emerging two-dimensional (2D) material, has received extensive interest due to its unique optical and electronic properties. In this work, we theoretically propose a monolayer BP-dielectric-metallic hybrid architecture, which exhibits a tunable nearly perfect absorption efficiency with ~99% at the mid-infrared wavelengths. The calculated results by finite-difference