We theoretically present a ring cavity optomechanical system including four interactions which are two optomechanical coupling with coupling strength G1 and G2, the interaction of the two resonators with coupling strength V, and the cavity-cavity coupling with coupling strength J. With the standard methods of quantum optics and input–output theory, the processes of evolution of the coherent reflection

Transfer characteristics of p-doped graphene/monolayer-MoS2 heterostructure at 300 K are measured experimentally and analyzed based on a model calculation. In the model, we first discretize the Poisson equation into multiple zones. In each zone the charge density is assumed constant and the Poisson equation can be transformed into a linear equation to determine the chemical potential self-consistently

The Zitterbewegung (ZB) effect is investigated in graphene with spacially modulated potential near the original Dirac point (ODP) and extra Dirac points (EDPs). Our calculations show that to get the large ZB oscillations in amplitude, the center of the Gaussian wave packet, characterized by the initial momentum κ0 and angle θ0, must be at θ0 = 0 for EDPs located at zero-energy, or θ0 = π/2 for both

An ultra-high sensitive sensor over a wide range of temperatures based on the optical Tamm resonance and the pyroelectric effect is presented. The lithium niobate (LN) material is considered in a one-dimensional photonic crystal (1D-PC) for such purpose. The sensing process is based on the displacement of the optical Tamm plasmon (TP) resonance in the near-infrared (NIR) region. All parameters were

In this work, we construct the BlueP/ZrSSe heterostructure and explore systematically its electronic characteristics and interface features in the framework of first principles calculations. The stacking and electric field effects on the interface characters of BlueP/ZrSSe heterostructure are also considered. We find that the BlueP layer interacts with Janus ZrSSe layer via the weak van der Waals forces

During recent years, ray tracing has frequently been used to study the absorption characteristics of structured solar cells. However, wave properties such as absorption enhancement due to resonances in optically thin solar films, cannot be explained by pure classical ray models. Here we present an exact three-dimensional ray model for oblique incidence of a plane electromagnetic wave on a thin film

In this work, detailed investigations of the electronic and optical properties of a Janus Ga2STe monolayer under a biaxial strain and electric field have been performed using density functional theory. Via the phonon spectrum and ab-initio molecular dynamics simulations, the dynamical and thermal stabilities of the Janus Ga2STe monolayer are verified. Our obtained results showed that the Janus Ga2STe

Si Nanowires (NWs) are typically synthesized on limited substrates that lack essential characteristics, such as mechanical flexibility and optical transparency. Most of the synthesis processes are also costly and inhibit widespread applications enabled by NWs. Throughout this study, therefore, we have shown that ordered and disordered single crystalline silicon nanowires can be grown and transferred

The thriving area of synthetic carbon allotropes witnesses theoretic proposals and experimental syntheses of many new two-dimensional monolayer structures, which are often achieved by careful arrangement of non-hexagon sp2 defects in graphene. Here, we introduce pyramid sp3 hybridization into sp2 network and propose a new carbon polymorph with clathrate pattern and minimum egg-tray shape (termed as

Zinc oxide nanosheet (ZnONS) is a favorable route to utilize for carrier various drug molecules in the human body. To realize suitable and optimized adsorption of the four anticancer drug molecules (6-MP, GB, 5-FU and CP) on the ZnONS surface, we substituted various concentrations of Zn atoms with Ga impurities on the ZnONS surface. Then, we studied different electronic properties of the nGa-doped

Recently, ferroelectric materials have attracted much attention in the field of spintronics since they enable to manipulation of spin splitting and spin textures via electric control of electric polarization. Here, two-dimensional ferroelectric SnSe monolayer (ML) comprises a promising candidate for spintronics since it has large and switchable in-plane electric polarization. However, the application

We study numerically the effect of the on-site Hubbard interaction U on the Anderson localization of two-interacting particles in a one-dimensional lattice with structural disorder. By solving the time-dependent Schrödinger equation to follow the time evolution of an initially localized two-electron state, we show the inter-particle interaction employing a non monotonic behavior on the Anderson localization

In the last four years, 2D-TMDs materials have gained huge attention from researchers because they represent another means of getting a material with bandgap energy and stable dynamically for electronics applications. Astonishingly, few of them have synthesized and there is still a lack of theoretical and experimental data on their bandgap energy, which limits the chance of producing new physical properties

The optical properties of InAs quantum dashes (QDashes) grown on InP and InAs quantum dots (QDots) grown on GaAs in a dashes- or dots-in-a-well (DWELL) configuration are comparatively investigated using temperature-dependent photoluminescence (PL) measurements. The trends in PL characteristics such as exciton energy, spectral bandwidth and integrated intensity with respect to temperature are found

For magnetic hyperthermia (MHT) applications the magnetic nano-particles (NPs) should have high saturation magnetization M, low coercive field Hc, Curie temperature TC ≈ 315 K, size d < 20 nm and biocompatibility. M is very small in undoped CeO2 NPs but doping with transition metal ions could enhance M. To observe an increase of M and a decrease of Hc the enhanced oxygen vacancies, the interaction

We have theoretically investigated the drag resistivity in electron-electron bilayer system by using the random phase approximation (RPA) for weakly interacting regime, at low temperature, high density, and large interlayer separation limit. We show analytical expressions by using long wavelength (low frequency regime) expansion of response function in Boltzmann regime and bare Coulomb interaction

The present study explores the effect of annealing temperature on the charge injection and transport properties of the devices composed of the active layer of poly (3-hexylthiophene) (P3HT):graphene(G) nanocomposites. Changes in the molecular ordering of the P3HT domain induced by the thermal annealing were examined through UV–visible spectroscopy, Raman spectroscopy, and X-ray diffraction studies

Because the van der Waals (vdW) heterostructure offers unusual physical properties that can pave new ways toward design of nanoelectronic and optoelectronic devices, we have studied the electronic structures of C2N/germanane vdW heterostructures under vertical electric field and strain using density functional theory (DFT). It is found that metal-semiconductor phase transitions occurred at −0.4 and

2D nanomaterials have been reported to demonstrate interesting magnetic phases when doped with transition metal double impurities. To understand the atomistic origin of such magnetism in pristine, vacancy defected and cobalt (Co)-transition metal (V, Nb, Ta, Zr, Hf, W) pairs co-doped hexagonal boron nitride nanosheet (h-BNNS), we report a systematic investigation of the structural, electronics and

Plasmonic Fano resonances, which result from the interaction between two plasmon modes in subwavelength nanostructures, provide a unique way to realize promising applications in light manipulation technology. Here, we investigate the infrared plasmonic Fano resonances of subwavelength periodic hole arrays with different geometric configurations in a metallic film containing Z-shaped hole arrays, cross-shaped

We present a systematic study of the optical absorption coefficient (OAC) and refractive index change (RIC) for a symmetric semiconductor nanostructure. We derived the OAC and RIC following two approaches, one without approximations, besides the usual ones (rotating-wave approximation and application of a two-level model), and the other using an approximation keeping only the contribution of the linear

Due to quantum confinement effect, quantum dots (QDs) would show totally different electronic and optical properties from two-dimensional (2D) nanosheets. For the first time, we have systemically investigated the optical, electronic and photocatalytic properties of Ti3C2O2 QDs based on the first-principles calculations. Our results show that the most stable structures of Ti3C2O2 QDs have features of

Electronic and photocatalytic properties of single-layer Antimonene nanosheets have been investigated. The variation of the energy gap between HOMO and LUMO levels concerning the nanosheet width along with both armchair and zigzag directions has been explored up to 388 atoms. It is shown that the armchair edges in Antimonene nanosheet are chemically more active than that of zigzag edge. Here, we also

In this paper, a single-band tunable metamaterial absorber with metal disk array is verified in Terahertz (THz) range. An absorption peak Is achieved based on local surface plasmon (LSP) mode resonance at 14.3 THz with 90% amplitude under room temperature. In the first stage of measurement, this absorption peak is enhanced and shifted to lower frequencies with diameter increasing, while reduced and

Gamma-graphyne sheet is a semiconductor with a bandgap of about 0.5 eV. For electronic applications, we need a tunable energy gap. For this purpose, we introduce a tight-binding based method which enables us to study the effects of oriented strains and also electric fields on electronic properties of nanoribbons of monolayer gamma-graphyne. Our results shows that the system has a controllable bandgap

Co-phthalocyanine molecules have wide range of optoelectronics and sensor applications. Motivated by its importance, we studied the adsorption of CoPc thin to thick films on Au(111) surface by using ultraviolet photoelectron spectroscopy (UPS) coupled with angle resolved UPS (AR-UPS) and scanning tunnelling microscopy (STM). Molecular spectral emissions are found to be at 5.13, 7.94, and 10.32 eV below

We consider a ring geometry with a quantum dot (QD) embedded in one of its arms, which is coupled symmetrically to two normal leads and threaded by Aharonov-Bohm (AB) flux φ. The QD is coupled to a topological nanowire. Using scattering matrix method, the differential conductance and current cross correlation are investigated. By varying the external magnetic field strength and the coupling strength

One-dimensional nanotubes have become an indispensable ideal candidate material for nano-device applications due to their excellent and unique electronic, mechanical, and thermal properties. By the first-principles method of density functional theory, we have theoretically investigated the structural stability, electronic properties, carrier mobility, and Poisson's ratio of C3N single-walled nanotubes

This commentary shows that the heat generation parameter (γ) is dimensionless only if the parameter (n) = 1, which means constant surface thickness. However, the authors utilized n = 2 (shape with decreasing thickness) in their figures. For the motion type, n = 2 represents accelerated motion. Therefore, the heat generation parameter (γ) is dimensional.

Hot electrons relax by interacting with phonons, so information about the electron-phonon interaction mechanisms are obtained by examining the cooling processes of hot electrons. In this study, the effect of annealing time on the electron temperature and energy relaxation rates in as-grown and annealed n-type modulation-doped Ga0.68In0.32N0.017As0.983/GaAs quantum well (QW) samples were investigated

We study the localization properties of the two-dimensional Lieb lattice and its extensions in the presence of disorder using the transfer matrix method and finite-size scaling. We find that all states in the Lieb lattice and its extensions are localized for W≥1. Clear differences in the localization properties between disordered flat bands and disordered dispersive bands are identified. Our results

The electronic characteristics of transition metal adatoms (Fe, Co, Ni, Cu, Ru, Rh, Pd, Ag, Os, Ir, Pt and Au) adsorbed on monolayer stanene have been investigated by using the first-principles calculations. The results show that the transition metal atoms are energetically favorable at the hollow and top sites of the stanene. Stanene has good adsorption capacity to foreign adsorbed atoms, and the

This study demonstrates an Al0.3Ga0.7N/GaN heterostructure field-effect transistor (HFET), which features a regrown p-GaN gate layer formed by selective-area regrowth using Si ion implantation at the drain and source area as a mask layer. The surface of the Si-implanted area has distorted lattices compared with the implantation-free area. As such, selective-area growth (SAG) can be achieved when the

Recently, a novel carbon based nanomaterial, boron-graphdiyne (BGDY) was experimentally realized through a bottom-to-up synthetic strategy, which is a π-conjugated structure comprised of all sp-hybridized carbon skeleton and boron heteroatoms in a well-organized two-dimensional (2D) molecular plane, and has been demonstrated to exhibit good semiconducting properties with excellent conductivity. The

Phononic crystal sensor is a novel technology for sensing applications with high performance. The present work proposes theoretically a design of gas (CO2) sensor based on a one-dimensional (1D) porous silicon (PSi) phononic crystal (PnC) sandwiched between two thin rubber layers. The transfer matrix method (TMM) was used for the numerical modeling of the acoustic waves spectra through the 1DPSi-PnC

We present theoretical results for the temperature and magnetic field dependence of the thermoelectric response in monolayer graphene systems due to scattering by random charged impurity centers. The main effect of the random charged impurities is considered within the random phase approximation (RPA) and consists in a drastically changed energy dependence of the electron scattering time. The system’s

In the current study, the density functional theory is utilized to investigate the elastic and plastic properties of the 2×2 and 3×3 pristine and transition metal (TM) doped arsenene. Different atoms, including Co, Cr, Fe, Mn, Ni, Sc, Ti and V are selected for this purpose. It is shown that doping of the transition metal atoms would result in the reduction of Young's and bulk moduli of the pristine

Nickel oxide nanoparticles were first synthesized by sputtering high-purity nickel in an oxygen plasma of a low-pressure arc discharge. The structure, morphology, and optical and magnetic properties of NiO nanoparticles were studied by XRD, TEM, FTIR, UV-VIS, and VSM. TEM images showed that the obtained NiO nanoparticles have a narrow particle size distribution and an average particle size of 12 nm

The purpose of this study is to generalize the Coordinate Integral Transform recently introduced in literature for the self-consistent solution of Schrödinger equation in one-dimensional systems with position-dependent mass. It was revealed that the present generalized approach reveals several motivating properties in material sciences and may be used to model and solve a large number of problems arising

We theoretically investigate the orbital hybridization and spin-dependent transport in organic ferromagnetic co-oligomer molecules. The results reveal that the hybridized orbitals are sensitive to the spin configuration of the two moieties, which manifests in both the eigenvalue and spatial localization. A large tunneling magnetoresistance effect is achieved by calculating the transport property at

Based on a graphene asymmetric sdouble ellipse (ADE) structure, the tunable Fano resonance characteristics in the terahertz range have been symmetrically studied, including the effects of graphene Fermi levels, asymmetrical degrees, operation frequencies and structural parameters. The results show that due to the strong coupling between the incident THz waves and graphene ADE structures, a strong Fano

The theoretical study of hydrazine in the presence of moisture doped single-walled carbon nanotube (SWCNT) where the donor state (DS) occurred in the electronic band structure, which has previously been reported. Herein, We reveal that the density functional theory (DFT) studies of pure hydrazine formed the hydrogen bond network (HBN) on SWCNT, leading to the n-type behavior. DFT approaches including