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
收藏
页码：305 / 308
页数：4
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