OBSERVATION OF MAGNETIC-FIELD-INDUCED DELOCALIZATION - TRANSITION FROM ANDERSON INSULATOR TO QUANTUM HALL CONDUCTOR

被引：184

作者：

JIANG, HW

JOHNSON, CE

WANG, KL

HANNAHS, ST

机构：

[1] UNIV CALIF LOS ANGELES,DEPT ELECT ENGN,LOS ANGELES,CA 90024

[2] MIT,FRANCIS BITTER NATL MAGNET LAB,CAMBRIDGE,MA 02139

来源：

PHYSICAL REVIEW LETTERS | 1993年 / 71卷 / 09期

关键词：

D O I：

10.1103/PhysRevLett.71.1439

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the first experimental observation of a magnetic-field-induced transition from an Anderson insulator to a quantum Hall conductor in a two-dimensional electron gas (2DEG) system. With sufficiently strong disorder, the 2DEG is an Anderson insulator with a divergent resistance at B = 0. The 2DEG is transformed into a quantum Hall conductor with a vanishing resistance as T --> 0 and a quantized Hall resistance when the lowest Landau level is filled. The observations demonstrate the magnetic-field-induced delocalization and are consistent with a recently proposed global phase diagram.

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页码：1439 / 1442

页数：4

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