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

Author

Listed:
  • 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
    University of Chinese Academy of Sciences)

  • Xi Lin

    (Peking University
    University of Chinese Academy of Sciences
    Peking University)

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.

Suggested Citation

  • Jiaojie Yan & Yijia Wu & Shuai Yuan & Xiao Liu & L. N. Pfeiffer & K. W. West & Yang Liu & Hailong Fu & X. C. Xie & Xi Lin, 2023. "Anomalous quantized plateaus in two-dimensional electron gas with gate confinement," Nature Communications, Nature, vol. 14(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-37495-9
    DOI: 10.1038/s41467-023-37495-9
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    References listed on IDEAS

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    1. R. de-Picciotto & M. Reznikov & M. Heiblum & V. Umansky & G. Bunin & D. Mahalu, 1997. "Direct observation of a fractional charge," Nature, Nature, vol. 389(6647), pages 162-164, September.
    2. Aveek Bid & N. Ofek & H. Inoue & M. Heiblum & C. L. Kane & V. Umansky & D. Mahalu, 2010. "Observation of neutral modes in the fractional quantum Hall regime," Nature, Nature, vol. 466(7306), pages 585-590, July.
    3. Mitali Banerjee & Moty Heiblum & Vladimir Umansky & Dima E. Feldman & Yuval Oreg & Ady Stern, 2018. "Observation of half-integer thermal Hall conductance," Nature, Nature, vol. 559(7713), pages 205-210, July.
    4. Mitali Banerjee & Moty Heiblum & Amir Rosenblatt & Yuval Oreg & Dima E. Feldman & Ady Stern & Vladimir Umansky, 2017. "Observed quantization of anyonic heat flow," Nature, Nature, vol. 545(7652), pages 75-79, May.
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