We have studied the effects of strong impurity scattering on disordered superconductors beyond the low impurity concentration limit. By applying the full CPA to a superconductiong A-B binary alloy, we calculated the fluctuations of the local order parameters ∆A,∆B and charge densities, nA, nB for weak and strong on site disorder. We find that for narrow band alloy s-wave superconductors the con...

The predicted x-ray and neutron scattering by random semiconductor alloys A1−xBxC with the zinc-blende structure has been analysed using direct simulation of the scattering from the atoms in the lattice, and also using a continuum theory. This initial work focuses on the special case of the single-impurity limit (small concentration x) where the elastic properties of both of the pure crystals (...

Nanowires are strong candidates as potential replacements for Bulk MOSFET architectures due to their better electrostatic integrity and performance. Impurity scattering is the source of series resistance that degrades the performance of small, doped nanowire transistors. In this work we have used a silicon nanowire transistor to investigate the inclusion of series resistance in quantum transpor...

We present electronic structure and transport calculations for hydrogen and lithium chains, using density functional theory and scattering theory on the Green's function level, to systematically study impurity effects on the transmission coefficient. To this end we address various impurity configurations. Tight-binding results allow us to interpret our the findings. We analyze under which circu...

Resonant classical light scattering by impurity atoms inside dielectric cubic lattices is investigated in the point-dipole limit. Modifications to resonance frequencies and linewidths are shown to be different for substitutional and interstitial impurities. Spontaneous emission rates inside dielectrics exhibit the well-known empty-cavity and Lorentz local-field factors for substitutional and in...

Electron – impurity scattering in the crust of neutron stars may be a relevant mechanism in delaying the cooling and in enhancing the decay of the pulsar’s magnetic field. Extending previous work, in the present note I investigate the physics of the interfaces between layers in the crust of an isolated neutron star. The calculations confirm the possible presence of high impurity concentrations ...

We analyze the dephasing effect on the backscattering behavior of the helical surface states in 3D topological insulators. We show that the combination of dephasing and impurity scattering can cause backscattering in the helical states. Especially for the charge impurity case, the backscattering cross section becomes extremely large around the Dirac point. This large backscattering behavior can...

We study the properties of an impurity immersed in a weakly interacting Bose gas, i.e., polaron. In perturbatively-tractable limit weak impurity-boson interactions many its are known to depend only on scattering length. Here we demonstrate that for strong (unitary) all static quasiproperties polaron dilute such as energy, residue, Tan's contact and number bosons trapped nearby impurity, potenti...

Time-resolved terahertz (THz) electromodulation spectroscopy is applied to investigate the high-frequency transport of electrons in gallium nitride at different doping concentrations and densities of threading dislocations. At THz frequencies, all structures reveal Drude transport. The analysis of the spectral response provides the fundamental transport properties, such as the electron scatteri...