Dielectric properties of the electron glass

Lamba, Subhalakshmi ; Deepak Kumar, (1999) Dielectric properties of the electron glass Physical Review B, 59 (7). pp. 4766-4776. ISSN 0163-1829

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Official URL: http://prb.aps.org/abstract/PRB/v59/i7/p4766_1

Related URL: http://dx.doi.org/10.1103/PhysRevB.59.4766


The dielectric-constant matrix of a system of electrons that have been localized by disorder is calculated as a function of frequency and distance. It is shown that the basic polarization process in these systems is quite different from those with extended electrons, as the electronic transitions can only occur by phonon-mediated hops between localized states. It is also argued that the random-phase approximation is not adequate for such systems, as the correct account for the excitation energies of the system requires inclusion of electron-hole interaction. Our analysis provides an expression for screening length that shows a basic departure from the Thomas-Fermi approximation. On the basis of our results for polarizability, we also argue that a soft Coulomb gap for electron-hole excitations should exist to provide dielectric stability to the system.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:9873
Deposited On:02 Nov 2010 10:35
Last Modified:31 May 2011 09:28

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