RF CONDUCTIVITY OF A 2-DIMENSIONAL ELECTRON-SYSTEM AT SMALL LANDAU-LEVEL FILLING FACTORS

被引：89

作者：

PAALANEN, MA

WILLETT, RL

LITTLEWOOD, PB

RUEL, RR

WEST, KW

PFEIFFER, LN

BISHOP, DJ

机构：

[1] AT and T Bell Laboratories, Murray Hill

来源：

PHYSICAL REVIEW B | 1992年 / 45卷 / 19期

关键词：

D O I：

10.1103/PhysRevB.45.11342

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have determined the dynamical conductivity-sigma(k,omega) of the two-dimensional (2D) electrons in extremely high-mobility GaAs/Al1-xGaxAs heterostructures by measuring the attenuation and velocity of surface acoustic waves. In the small-filling-factor limit we find a broad conductivity resonance indicating a pinning mode of the 2D electron system, which has condensed into an ordered phase. Surprisingly, the data suggest a relatively small correlation length even in these high-quality systems.

引用

页码：11342 / 11345

页数：4

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