TRANSPORT EVIDENCE FOR PHASE-SEPARATION INTO SPATIAL REGIONS OF DIFFERENT FRACTIONAL QUANTUM HALL FLUIDS NEAR THE BOUNDARY OF A 2-DIMENSIONAL ELECTRON-GAS
TRANSPORT EVIDENCE FOR PHASE-SEPARATION INTO SPATIAL REGIONS OF DIFFERENT FRACTIONAL QUANTUM HALL FLUIDS NEAR THE BOUNDARY OF A 2-DIMENSIONAL ELECTRON-GAS
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DOI：
10.1103/physrevlett.69.2114
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发表时间：
1992-10-05
影响因子：
8.6
通讯作者：
CUNNINGHAM, JE
中科院分区：
文献类型：
--
作者：
CHANG, AM;CUNNINGHAM, JE
在边界附近，在缓慢增加的边界势的情况下，2D电子气可以相分离成填充因子（nu）依次降低的分数量子霍尔流体区域。我们目前的实验证据表明，在nu = 1/3，1/2和1量子霍尔制度的四引线霍尔结显示，通过侧门的结边界，霍尔电阻可以接近量子化值的较低的nu流体在顶部门控的铅，而不是较高的nu流体在结中心。这意味着在接合边界附近存在低nu流体。
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.