Wigner glass, spin liquids and the metal-insulator transition

被引:99
|
作者
Chakravarty, S [1 ]
Kivelson, S [1 ]
Nayak, C [1 ]
Voelker, K [1 ]
机构
[1] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
来源
PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES | 1999年 / 79卷 / 06期
关键词
D O I
10.1080/13642819908214845
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Recent experiments on the two-dimensional electron gas in various semiconductor devices have shown an unexpected metal-insulator transition. These experimental results cannot be understood from the conventional perspective of weak interactions. We propose that the low-density insulating state is the Wigner glass, a phase with quasi-long-range structural order and competing ferromagnetic and antiferromagnetic spin-exchange interactions; the transition is the melting of this Wigner glass, the disorder allowing the transition to be second order; within the Wigner glass phase there are at least two distinct magnetic ground states-a ferromagnetic state at very low electron density and a spin-liquid state with a spin pseudogap at higher densities; and the metallic side of the transition is a non-Fermi liquid. We present a proposed phase diagram as a function of disorder strength and density and suggest experimental signatures of the various phases and transitions.
引用
收藏
页码:859 / 868
页数:10
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