Anomalous quantized plateaus in two-dimensional electron gas with gate confinement

Jiaojie Yan, Yijia Wu, Shuai Yuan, Xiao Liu, L. N. Pfeiffer, K. W. West, Yang Liu, Hailong Fu, X. C. Xie and Xi Lin ()
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Jiaojie Yan: Peking University
Yijia Wu: Peking University
Shuai Yuan: Peking University
Xiao Liu: Peking University
L. N. Pfeiffer: Princeton University
K. W. West: Princeton University
Yang Liu: Peking University
Hailong Fu: Zhejiang University
X. C. Xie: Peking University
Xi Lin: Peking University

Nature Communications, 2023, vol. 14, issue 1, 1-6

Abstract: Abstract Quantum information can be coded by the topologically protected edges of fractional quantum Hall (FQH) states. Investigation on FQH edges in the hope of searching and utilizing non-Abelian statistics has been a focused challenge for years. Manipulating the edges, e.g. to bring edges close to each other or to separate edges spatially, is a common and essential step for such studies. The FQH edge structures in a confined region are typically presupposed to be the same as that in the open region in analysis of experimental results, but whether they remain unchanged with extra confinement is obscure. In this work, we present a series of unexpected plateaus in a confined single-layer two-dimensional electron gas (2DEG), which are quantized at anomalous fractions such as 9/4, 17/11, 16/13 and the reported 3/2. We explain all the plateaus by assuming surprisingly larger filling factors in the confined region. Our findings enrich the understanding of edge states in the confined region and in the applications of gate manipulation, which is crucial for the experiments with quantum point contact and interferometer.

Date: 2023
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DOI: 10.1038/s41467-023-37495-9

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