After two decades since the discovery of ferromagnetism in manganese-doped gallium arsenide, its origin is still debated, and many doubts are related to the electronic structure. Here we report an experimental and theoretical study of the valence electron spectrum of manganese-doped gallium arsenide. The experimental data are obtained through the differences between off- and on-resonance photo ...

Recently, spiral inductors have widely been used instead of resistors in the design of matching circuits to enhance the thermal noise performance of a wireless transceiver. However, such elements usually have low quality factor (Q) and may encounter the self-resonance in microwave-frequency band which permits its use in higher frequencies, and on the other hand, they occupy the large on-chip sp...

In this paper, the structural parameters, energy bands structure, density ofstates and charge density of HgSe in the Zincblende(B3) phase have been investigated.The calculations have been performed using the Pseudopotential method in theframework of density functional theory (DFT) by Quantum Espresso package. Theresults for the electronic density of states (DOS) show tha...

-The phonon-assisted band-to-band tunneling rate in crystalline silicon is calculated using the equilibrium Green's function formalism. Electron-phonon collisions, that balance the momentum, are included in the perturbation operator. Houston-type solutions are used for the time dependence of the Bloch states. RPA deeoupling yields a tractable expression for the differential tunneling conductivi...

Ground based Ka-band (33 GHz) cloud radar measurements collected at the Southern Great Plains (SGP) Cloud and Radiation Testbed (CART) site show that liquid cloud measurements are often contaminated by insect echoes during warm weather. Depolarization is one method of identifying and filtering insects from radar data. However, this technique often fails because the high number density of insect...

the optical spectrum band positions and epr parameters (g factors g//, g^ and hyperfine structure constants a// and a^) for vo2+ ions in zn(antipyrine)2(no3)2 are theoretically studied from the complete diagonalization (of energy matrix) method (cdm) and the perturbation theory method (ptm). in the two methods, the contributions from the spin–orbit (so) coupling of central 3dn ion and ligand ar...

The band-gap energy and the band line-up of InGaAlAs quaternary compound material on InP are essential information for the theoretical study of physical properties and the design of optoelectronics devices operating in the long-wavelength communication window. The bandgap interpolation of In1 − x − yGaxAlyAs on InP is known to be a challenging task due to the observed discrepancy of experimenta...

We present first-principles calculations of the electronic structure of BiVO4 at various levels of theory. In the calculations, we take into account a series of effects that affect the band gap, i.e., spin-orbit coupling, electron-hole interaction, nuclear quantum motions, and thermal vibrations. All these effects lead to a significant renormalization of the band gap. After including the releva...

Utilizing the rigorous field distribution of the ridge waveguide eigemnortes, this paper presents an accurate computer-aided design of compact, low-cost, low-insertion-loss evanescent-mode waveguide band-pass filters with bilateral metallic E-plane fins. The design theory takes into account the influences of both the finite fin thickness and the higher order mode interaction at all discontinuit...