Melting of the Wigner lattice at T=0

Lenac, Z. and Šunjić, Marijan (1995) Melting of the Wigner lattice at T=0. Physical Review B, 52 (15). pp. 11238-11247. ISSN 1098-0121

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A two-dimensional electron system is expected to form a Wigner lattice at zero temperature but at very high electron densities even at T=0 one expects a phase transition from a crystal to a gas phase. For a Wigner lattice on a dielectric layer, a T=0 melting was also predicted at very low electron densities. Here we explain both high- and low-density phase transitions, studying the behavior of an external electron added to the periodic potential of a Wigner lattice. The band structure of this electron is calculated within a model of a quasi-two-dimensional lattice. The T=0 melting criterion is derived, comparing the chemical potentials of an additional electron when it joins the lattice or stays delocalized. Good qualitative agreement is found between our results and those obtained from the quantum extension of the Kosterlitz-Thouless melting theory.

Item Type: Article
Date: October 1995
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (1995) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 27 Aug 2014 13:12
Last Modified: 27 Aug 2014 13:12

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