Relaxation Processes in Coulomb Glasses

  • J. Bergli Department of Physics, University of Oslo
  • Y. M. Galperin Centre for Advanced Study at the Norwegian Academy of Science and Letters

Abstract

Coulomb glasses are materials with electron states localized by the disorder under conditions of long-range interactions between their particles. One realization of a Coulomb glass is a doped semiconductor at low temperatures. Another example is granular metals. Coulomb glasses show complex dynamics typical for other complex systems: sluggish, non-exponential, relaxation of the conductance as well as aging and memory effects similar to those observed in structural glasses. We report dynamical Monte Carlo simulations of relaxation processes in a Coulomb glass. Both the relaxation to equilibrium following an initial temperature quench and during and after a driving by a strong current is studied. We see that out of equilibrium there is an effective electron temperature established on a short timescale, and this relaxes slowly to the bath temperature. We also study the response of the system to an external perturbation and observe how it relaxes after such a perturbation. Both from a random state and after a perturbation from equilibrium we find that the effective temperature relaxes logarithmically

Published
Aug 14, 2012
How to Cite
BERGLI, J.; GALPERIN, Y. M.. Relaxation Processes in Coulomb Glasses. Revista Cubana de Física, [S.l.], v. 29, n. 1E, p. 1E9-1E12, aug. 2012. ISSN 2224-7939. Available at: <https://revistacubanadefisica.org/index.php/rcf/article/view/RCF_29-1E_009_2012>. Date accessed: 13 aug. 2022.
Section
Original Articles (E)