Frequency-dependent conductivity of electron glasses

Universal frequency-dependent conduction of electron glasses

Frequency Dependent Conductivity of the Fibonacci–Chain

Quasicrystals (QC)1 and their periodic approximants reveal unusual transport properties, e.g., extremely low conductivity for alloys of metallic constituents2, and it is generally believed that these properties are directly related to the long range but nonperiodic order. However, no coherent theoretical framework has been successfully established. For instance, previous calculations of the den...

'taxonomy' of Electron Glasses

We report measurements of the real and imaginary parts of the AC conductivity in the quantum limit, ω > kBT of insulating nominally uncompensated n-type silicon. The observed frequency dependence shows evidence for a crossover from interacting Coulomb glass-like behavior at lower energies to non-interacting Fermi glass-like behavior at higher energies across a broad doping range. The crossover ...

Effects of many-electron jumps in the relaxation and conductivity of Coulomb glasses

A numerical study of the energy relaxation and conductivity of the Coulomb glass is presented. The role of many-electron transitions is studied by two complementary methods: a kinetic Monte Carlo algorithm and a master equation in configuration space. A calculation of the transition rate for two-electron transitions is presented, and the proper extension of this to multielectron transitions is ...

Frequency dependent conductivity of vortex cores in type II superconductors

The recent optical transmission experiment of Karräi et al. has probed the localized quasiparticle excitations of vortices in the superconductor YBa2Cu3O7. In this paper we develop a microscopic description of single vortex dynamics, based on the Bogoliubov-deGennes equations and self-consistency through the gap equation, to determine the response of vortices to a transverse time dependent elec...