Bulk properties of the 5/2 fractional quantum Hall state with Corbino geometry

ORAL

Abstract

The nature of the ground state of the fractional quantum Hall (FQH) effects at half-filling in the second Landau level has been an interesting problem. In high-quality GaAs samples, the exact quantization of the 5/2 FQH state has been observed in van der Pauw geometry, but the fully bulk insulation of the 5/2 FQH state remains unrevealed. Corbino geometry, known for its edge-free nature, has been applied in studying the bulk physics of FQH states and charge density wave states recently. We will show our observation of bulk insulation in the 5/2 FQH state with Corbino geometry at an estimated low electron temperature of 12 mK. With in-plane electrical field, the stability of the 5/2 FQH state was explored. In our measurement, the 5/2 FQH state wasn’t enhanced by a weak in-plane electrical field as suggested. Our observation indicates a fully charge insulating nature of the bulk at filling factor 5/2 and could be informative for the proposed thermal conductivity measurements to search the striped Pfaffian and anti-Pfaffian state.

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Presenters

  • Jian Sun

    Peking University, International Center for Quantum Materials, Peking University

Authors

  • Jian Sun

    Peking University, International Center for Quantum Materials, Peking University

  • Pengjie Wang

    Peking University, International Center for Quantum Materials, Peking University

  • Zheyi Zhu

    Peking University

  • Jiasen Niu

    Peking University

  • Loren Pfeiffer

    Electrical Engineering, Princeton University, Princeton University, Princeton Univ, Department of Electrical Engineering, Princeton University, PRISM, Princeton University, Physics, Princeton University, Electrical Engineering, Princeton

  • Kenneth West

    Electrical Engineering, Princeton University, Princeton University, Princeton Univ, Department of Electrical Engineering, Princeton University, PRISM, Princeton University, Physics, University of Pittsburgh, Electrical Engineering, Princeton

  • Xi Lin

    Peking University