Relaxation dynamics in quantum electron-glasses

Details Relaxation dynamics in quantum electron-glasses Relaxation dynamics in quantum electron-glasses

2007-10-14

arxiv.org/abs/0710.2637v2

PRL 99, 226603 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

4 figures

Scientific paper

10.1103/PhysRevLett.99.226603

It is experimentally shown that, depending on the carrier-concentration of the system $n$, the dynamics of electron-glasses either \textit{slows down }with increasing temperature or it is \textit{independent} of it. This also correlates with the dependence of a typical relaxation time (or `viscosity') on $n$. These linked features are argued to be consistent with a model for dissipative tunneling. The slow relaxation of the electron glass may emerge then as a manifestation of friction in a many-body quantum system. Our considerations may also explain why strongly-localized granular metals are likely to show electron-glass effects while semiconductors are not.

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