Structural instabilities of a two-dimensional Wigner crystal in a lateral superlattice

被引：0

作者：

Govorov, AO

机构：

[1] Univ Munich, Sekt Phys, D-80539 Munich, Germany

[2] Inst Semicond Phys, Novosibirsk 630090 90, Russia

来源：

SUPERLATTICES AND MICROSTRUCTURES | 1998年 / 24卷 / 04期

关键词：

two-dimensional electron systems; Wigner crystal; semiconductor quantum wells; phase transitions;

D O I：

10.1006/spmi.1996.0375

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We consider the instability of a two-dimensional Wigner crystal in a short-period lateral superlattice. To find instabilities, we calculate the phonon spectrum of the electron lattice deformed by a periodic potential. We show that one of the transverse modes of the deformed electron crystal becomes soft when the electron density exceeds a critical value. This can result in a phase transition with the formation of a charge-density wave. (C) 1998 Academic Press.

引用

页码：305 / 308

页数：4

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