TRANSPORT EVIDENCE FOR PHASE-SEPARATION INTO SPATIAL REGIONS OF DIFFERENT FRACTIONAL QUANTUM HALL FLUIDS NEAR THE BOUNDARY OF A 2-DIMENSIONAL ELECTRON-GAS

被引:39
作者
CHANG, AM [1 ]
CUNNINGHAM, JE [1 ]
机构
[1] AT&T BELL LABS,HOLMDEL,NJ 07733
关键词
D O I
10.1103/PhysRevLett.69.2114
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Near the boundary, a 2D electron gas can phase separate into fractional quantum Hall fluid regions of successively lower filling factors (nu), in the case of a slowly increasing boundary potential. We present experimental evidence in the nu = 1/3, 1/2 and 1 quantum Hall regimes on a four-lead Hall junction showing that by side gating the junction boundary, the Hall resistance can be made to approach the quantized value of the lower nu fluids in the top-gated leads, rather than the higher-nu fluid at the junction center. This implies the presence of the lower-nu fluids near the junction boundary.
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页码:2114 / 2117
页数:4
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