Atomically thin high-temperature superconductors

ORAL

Abstract


The emergent technique of van der Waals stacking has started to impact on high temperature superconductivity [1][2]. Here we report the realization of superconducting unprotected Bi2Sr2CaCu2O8+δ (BSCCO) flakes down to 2.5 unit cells for studying high Tc superconductivity mechanism. We employ a novel solid state gating technique to effectively tune the carrier density of thin flakes, inducing the superconductor-insulator transition (SIT) in BSCCO. The corresponding evolution of the density of states (DOS) is unveiled by using planar tunnel junctions of graphite/BSCCO. The combination of gate tuning and tunneling spectroscopy shall be applicable to other two-dimensional materials.

[1] M. Liao, Y. Zhu, J. Zhang, R. Zhong, J. Schneeloch, G. D. Gu, K. Jiang, D. Zhang, X. Ma, and Q. K. Xue, Nano Lett. 18, 5660 (2018).
[2] S. Y. F. Zhao, N. Poccia, M. G. Panetta, C. Yu, J. W. Johnson, H. Yoo, R. Zhong, G. D. Gu, K. Watanabe, T. Taniguchi, S. V. Postolova, V. M. Vinokur, and P. Kim, arXiv: 1809.06944.

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Presenters

  • Yuying Zhu

    Tsinghua University

Authors

  • Yuying Zhu

    Tsinghua University

  • Menghan Liao

    Tsinghua University

  • Jin Zhang

    Tsinghua University

  • Ruidan Zhong

    Brookhaven National Laboratory

  • John Schneeloch

    Physics, University of Virginia, Brookhaven National Lab, Brookhaven National Laboratory, University of Virginia

  • Genda Gu

    Brookhaven National Laboratory, Brookhaven National Lab, Department of Condensed Matter Physics and Materials Science, Brookhaven, Brookhaven National Laboratory, Upton, New York 11973-5000, USA., Cond. Matt. Physics and Material Science, Brookhaven Natl Lab, Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Condensed Matter Physics & Materials Science Department, Brookhaven National Laboratory, Brookhaven National Labs, Long Island, NY, USA, 11973, Condensed Matter Physics & Materials Science, Brookhaven National Laboratory, Condensed Matter Physics, Brookhaven National Laboratory, Brookhaven National Laboratories, Chinese Academy of Sciences, Condensed Matter Physics & Materials Science, Brookhaven National Lab, Brookhaven Natl Lab

  • Kaili Jiang

    Tsinghua University

  • Ding Zhang

    Tsinghua University, State Key Laboratory of Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University

  • Xucun Ma

    Department of Physics, Tsinghua University, Tsinghua University, State Key Laboratory of Low-dimensional Quantum Physics, Department of Physics, Tsinghua University

  • Qikun Xue

    Department of Physics, Tsinghua University, Tsinghua University, State Key Laboratory of Low-dimensional Quantum Physics, Department of Physics, Tsinghua University