Time-reversal symmetry breaking superconductivity between twisted cuprate superconductors

被引：80

作者：

Zhao, S. Y. Frank ^{[1
]}

Cui, Xiaomeng ^{[1
]}

Volkov, Pavel A. ^{[1
,2
,3
]}

Yoo, Hyobin ^{[4
]}

Lee, Sangmin ^{[5
]}

Gardener, Jules A. ^{[6
]}

Akey, Austin J. ^{[6
]}

Engelke, Rebecca ^{[1
]}

Ronen, Yuval ^{[1
]}

Zhong, Ruidan ^{[7
,11
,12
]}

Gu, Genda ^{[7
]}

Plugge, Stephan ^{[8
,9
]}

Tummuru, Tarun ^{[8
,9
]}

Kim, Miyoung ^{[5
]}

Franz, Marcel ^{[8
,9
]}

Pixley, Jedediah H. ^{[2
]}

Poccia, Nicola ^{[1
,10
]}

Kim, Philip ^{[1
]}

机构：

[1] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA

[2] Rutgers State Univ, Ctr Mat Theory, Dept Phys & Astron, Piscataway, NJ 08854 USA

[3] Univ Connecticut, Dept Phys, Storrs, CT 06269 USA

[4] Sogang Univ, Inst Emergent Mat, Dept Phys, Seoul 04107, South Korea

[5] Seoul Natl Univ, Dept Mat Sci & Engn, Seoul 08826, South Korea

[6] Harvard Univ, Ctr Nanoscale Syst, Cambridge, MA 02138 USA

[7] Brookhaven Natl Lab, Dept Condensed Matter Phys & Mat Sci, Upton, NY 11973 USA

[8] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z4, Canada

[9] Univ British Columbia, Stewart Blusson Quantum Matter Inst, Vancouver, BC V6T 1Z4, Canada

[10] Leibniz Inst Solid State & Mat Res Dresden IFW Dre, D-01069 Dresden, Germany

[11] Shanghai Jiao Tong Univ, Tsung Dao Lee Inst, Shanghai 200240, Peoples R China

[12] Shanghai Jiao Tong Univ, Sch Phys & Astron, Shanghai 200240, Peoples R China

来源：

SCIENCE | 2023年 / 382卷 / 6677期

基金：

美国国家科学基金会; 加拿大自然科学与工程研究理事会;

关键词：

INTRINSIC JOSEPHSON-JUNCTIONS; ZERO-VOLTAGE STATE; GRAIN-BOUNDARIES; SHAPIRO STEPS; BI2SR2CACU2O8+DELTA; TRANSITION; BEHAVIOR; FIELD; OSCILLATIONS; STACKS;

D O I：

10.1126/science.abl8371

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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 degrees 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.

引用

页码：1422 / 1427

页数：6

共 98 条

[1]

Barone A., 1982, Physics and Applications of the Josephson Effect, DOI DOI 10.1002/352760278X

[2] Effect of Rashba and Dresselhaus spin-orbit coupling on supercurrent rectification and magnetochiral anisotropy of ballistic Josephson junctions [J].