Excitation spectrum of a two-dimensional Wigner lattice

Lenac, Z. and Šunjić, Marijan (1993) Excitation spectrum of a two-dimensional Wigner lattice. Physical Review B, 48 (19). pp. 14496-14501. ISSN 1098-0121

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Abstract

We propose a spectroscopic method to determine the existence of an electronic Wigner lattice at a given electron density n. We derive the ‘‘perpendicular’’ excited states of the two-dimensional Wigner lattice on a dielectric layer with a metallic substrate, and compare them with the corresponding excited states of the two-dimensional electron gas at the same electron densities. The transitions from the ground to the first excited state are studied in detail and we have found a significant difference between the lattice and the gas excitation energies for n≳10^8 cm^-2. In that sense, the spectroscopy of electronic transitions can prove the existence of a Wigner lattice and a rapid change in the excitation spectrum can serve for determination of the lattice melting temperature. A linear Stark effect in the case of a Wigner lattice is also analyzed.

Item Type: Article
Date: November 1993
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (1993) 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 11:47
Last Modified: 27 Aug 2014 11:47
URI: http://digre.pmf.unizg.hr/id/eprint/1435

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