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Josephson Diode Effect in Twisted Interface of Cuprate Superconductors

ORAL

Abstract

We report a tunable superconducting diode effect across the twisted cuprate Josephson junctions (JJs) near 45 degrees of twisting angle. The JJs are formed by twisted Van der Waals interfaces of two optimally doped Bi2Sr2CaCu2O8+x crystals assembled in a controlled environment. When the twisting angles are close to 45 degrees, we find the interfacial JJ coupled superconducting order parameter gains a nontrivial phase between the two layers. In these JJs, the second harmonic term becomes dominant in the current-phase relationship, leading to spontaneous time-reversal symmetry breaking. We observe the superconducting diode effect with non-reciprocal switching current distributions. The polarity of the diode can be switched by controlling the sweeping sequences of biasing current as the two TRS broken ground states can be selectively prepared according to resistively and capacitively shunted JJ model.

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Publication: <br>https://doi.org/10.48550/arXiv.2108.13455

Presenters

  • Xiaomeng Cui

    Harvard University

Authors

  • Xiaomeng Cui

    Harvard University

  • Pavel Volkov

    Harvard University; University of Connecticut, Rutgers University, Harvard University; University of Connecticut; Rutgers University

  • Shu Yang Frank Zhao

    MIT, Massachusetts Institute of Technology

  • Nicola Poccia

    IFW-Dresden

  • Hyobin Yoo

    Sogang University

  • Rebecca Engelke

    Harvard University

  • Yuval Ronen

    Weizmann Institute of Science, Harvard University, Weizmann Institute of Science

  • Ruidan Zhong

    Shanghai Jiao Tong Univ

  • Genda Gu

    Brookhaven National Laboratory

  • Stephan Plugge

    University of British Columbia

  • Tarun Tummuru

    University of British Columbia

  • Marcel Franz

    University of British Columbia

  • Jedediah H Pixley

    Rutgers University, New Brunswick, Rutgers University, Flatiron Institute, Department of Physics and Astronomy, Center for Materials Theory, Rutgers University, Piscataway, NJ, 08854, USA, Rutgers University

  • Philip Kim

    Harvard University