BROKEN SYMMETRIES AND LOCALIZATION LENGTHS IN ANDERSON INSULATORS - THEORY AND EXPERIMENT

被引:131
作者
PICHARD, JL [1 ]
SANQUER, M [1 ]
SLEVIN, K [1 ]
DEBRAY, P [1 ]
机构
[1] CEA SACLAY, SERV PHYS SOLIDE & RESONANCE MAGNET, F-91191 GIF SUR YVETTE, FRANCE
关键词
D O I
10.1103/PhysRevLett.65.1812
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Extending a random-matrix theory developed earlier, we show that breaking a basic symmetry in an Anderson insulator (e.g., time-reversal symmetry or spin-rotation symmetry) generically yields a multiplication of the localization length by universal factors. Numerical calculations and magnetoconductance measurements in the Mott variable-range-hopping regime confirm that the removal of time-reversal symmetry by a magnetic field yields 2 in the absence of spin-orbit scattering, and 2 in the presence of spin-orbit coupling. © 1990 The American Physical Society.
引用
收藏
页码:1812 / 1815
页数:4
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