Transition to exponential relaxation in weakly disordered electron glasses

Metal-Insulator-Transition in a Weakly interacting Disordered Electron System

C. E. Ekuma, 2, ∗ S.-X. Yang, 2 H. Terletska, 2 K.-M. Tam, 2 N. S. Vidhyadhiraja, J. Moreno, 2 and M. Jarrell 2, † Department of Physics & Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA Center for Computation and Technology, Louisiana State University, Baton Rouge, Louisiana 70803, USA Theoretical Sciences Unit, Jawaharlal Nehru Center for Advanced Scientific Research,...

Electron-electron Relaxation in Disordered Interacting Systems

We study the relaxation of a non-equilibrium carrier distribution under the influence of the electron-electron interaction in the presence of disorder. Based on the Anderson model, our Hamiltonian is composed from a single particle part including the disorder and a two-particle part accounting for the Coulomb interaction. We apply the equation-of-motion approach for the density matrix, which pr...

Stretched exponential relaxation and ac universality in disordered dielectrics

Stretched Exponential Relaxation of Glasses at Low Temperature.

The question of whether glass continues to relax at low temperature is of fundamental and practical interest. Here, we report a novel atomistic simulation method allowing us to directly access the long-term dynamics of glass relaxation at room temperature. We find that the potential energy relaxation follows a stretched exponential decay, with a stretching exponent β=3/5, as predicted by Philli...

Mechanical relaxation in glasses and at the glass transition

The Gilroy-Phillips model of relaxational jumps in asymmetric double well potentials, developed for the Arrhenius-type secondary relaxations of the glass phase, is extended to a formal description of the breakdown of the shear modulus at the glass transition, the α-process. The extension requires the introduction of two separate parts of the barrier distribution function f(V ), with a different...