Time-reversal symmetry breaking superconductivity between twisted cuprate superconductors-Reference-Cited by-同舟云学术

Time-reversal symmetry breaking superconductivity between twisted cuprate superconductors

Published:2023-12-22 Issue:6677 Volume:382 Page:1422-1427
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Zhao S. Y. Frank¹^ORCID,Cui Xiaomeng¹^ORCID,Volkov Pavel A.¹²³^ORCID,Yoo Hyobin⁴^ORCID,Lee Sangmin⁵^ORCID,Gardener Jules A.⁶^ORCID,Akey Austin J.⁶^ORCID,Engelke Rebecca¹^ORCID,Ronen Yuval¹^ORCID,Zhong Ruidan⁷,Gu Genda⁷^ORCID,Plugge Stephan⁸^ORCID,Tummuru Tarun⁸^ORCID,Kim Miyoung⁵^ORCID,Franz Marcel⁸^ORCID,Pixley Jedediah H.²^ORCID,Poccia Nicola¹⁹^ORCID,Kim Philip¹^ORCID

Affiliation:

1. Department of Physics, Harvard University, Cambridge, MA 02138, USA.

2. Center for Materials Theory, Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA.

3. Department of Physics, University of Connecticut, Storrs, CT 06269, USA.

4. Department of Physics, Institute of Emergent Materials, Sogang University, Seoul 04107, Korea.

5. Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Korea.

6. Center for Nanoscale Systems, Harvard University, Cambridge, MA 02138, USA.

7. Department of Condensed Matter Physics and Materials Science, Brookhaven National Laboratory, Upton, NY 11973, USA.

8. Department of Physics and Astronomy and Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.

9. Leibniz Institute for Solid State and Materials Research Dresden (IFW Dresden), 01069 Dresden, Germany.

Abstract

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 Bi 2 Sr 2 CaCu 2 O 8+ 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.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Link

https://www.science.org/doi/pdf/10.1126/science.abl8371

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