Melting of the Electron Glass

Details Melting of the Electron Glass Melting of the Electron Glass

1999-03-18

arxiv.org/abs/cond-mat/9903272v2

Phys. Rev. Lett. 83, 4642 (1999)

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 2 figures; minor corrections and new footnotes added

Scientific paper

10.1103/PhysRevLett.83.4642

A model of spinless interacting electrons in presence of randomness is examined using an extended dynamical mean-field formulation. When the interaction strength is large as compared to the Fermi energy, a low temperature glassy phase is identified, which in our formulation corresponds to a replica-symmetry breaking instability. The glassy phase is characterized by a pseudo-gap in the single particle density of states, reminiscent of the Coulomb gap of Efros and Shklovskii. Due to ergodicity breaking, the ``zero-field cooled'' compressibility of this electron glass vanishes at T=0, consistent with absence of screening. When the Fermi energy exceeds a critical value, the glassy phase is suppressed, and normal metallic behavior is recovered.

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