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Time-reversal symmetry breaking superconductivity between twisted cuprate superconductors.
Zhao, S Y Frank; Cui, Xiaomeng; Volkov, Pavel A; Yoo, Hyobin; Lee, Sangmin; Gardener, Jules A; Akey, Austin J; Engelke, Rebecca; Ronen, Yuval; Zhong, Ruidan; Gu, Genda; Plugge, Stephan; Tummuru, Tarun; Kim, Miyoung; Franz, Marcel; Pixley, Jedediah H; Poccia, Nicola; Kim, Philip.
Afiliação
  • Zhao SYF; Department of Physics, Harvard University, Cambridge, MA 02138, USA.
  • Cui X; Department of Physics, Harvard University, Cambridge, MA 02138, USA.
  • Volkov PA; Department of Physics, Harvard University, Cambridge, MA 02138, USA.
  • Yoo H; Center for Materials Theory, Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA.
  • Lee S; Department of Physics, University of Connecticut, Storrs, CT 06269, USA.
  • Gardener JA; Department of Physics, Institute of Emergent Materials, Sogang University, Seoul 04107, Korea.
  • Akey AJ; Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea.
  • Engelke R; Center for Nanoscale Systems, Harvard University, Cambridge, MA 02138, USA.
  • Ronen Y; Center for Nanoscale Systems, Harvard University, Cambridge, MA 02138, USA.
  • Zhong R; Department of Physics, Harvard University, Cambridge, MA 02138, USA.
  • Gu G; Department of Physics, Harvard University, Cambridge, MA 02138, USA.
  • Plugge S; Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, NY 11973, USA.
  • Tummuru T; Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, NY 11973, USA.
  • Kim M; Department of Physics and Astronomy and Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
  • Franz M; Department of Physics and Astronomy and Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
  • Pixley JH; Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea.
  • Poccia N; Department of Physics and Astronomy and Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
  • Kim P; Center for Materials Theory, Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA.
Science ; 382(6677): 1422-1427, 2023 Dec 22.
Article em En | MEDLINE | ID: mdl-38060675
Twisted interfaces between stacked van der Waals (vdW) cuprate crystals present a platform for engineering superconducting order parameters by adjusting stacking angles. Using a cryogenic assembly technique, we construct twisted vdW Josephson junctions (JJs) at atomically sharp interfaces between Bi2Sr2CaCu2O8+x crystals, with quality approaching the limit set by intrinsic JJs. Near 45° twist angle, we observe fractional Shapiro steps and Fraunhofer patterns, consistent with the existence of two degenerate Josephson ground states related by time-reversal symmetry (TRS). By programming the JJ current bias sequence, we controllably break TRS to place the JJ into either of the two ground states, realizing reversible Josephson diodes without external magnetic fields. Our results open a path to engineering topological devices at higher temperatures.
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2023 Tipo de documento: Article
Texto completo
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2023 Tipo de documento: Article