Persistent Josephson tunneling between Bi2Sr2CaCu2O8+x flakes twisted by 45° across the superconducting dome

Zhu, Yuying1,2; Wang, Heng3,4; Wang, Zechao5,6; Hu, Shuxu3,4; Gu, Genda7; Zhu, Jing5,6; Zhang, Ding1,3,4,8; Xue, Qi-Kun1,3,4,9

2023-11-01

10.1103/PhysRevB.108.174508

PHYSICAL REVIEW B   影响因子和分区

2469-9950

2469-9969

There is a heated debate on the Josephson effect in twisted Bi2Sr2CaCu2O8+x flakes. Latest results suggest the presence of either anomalously isotropic pairing or exotic d + id-wave pairing, in addition to the commonly believed d-wave one. Here, we address this controversy by fabricating ultraclean junctions with uncompromised crystalline quality at the junction interface. In the optimally doped regime, we obtain prominent Josephson coupling (2-4 mV) in multiple junctions with the twist angle of 45 degrees , in sharp contrast to a recent report that shows two orders of magnitude suppression around 45 degrees from the value at 0 degrees. We further extend this study to the previously unexplored overdoped regime and observe pronounced Josephson tunneling at 45 degrees together with Josephson diode effect up to 50 K. Our study helps establish the persistent presence of an isotropic pairing component across the entire superconducting phase diagram.

SCI

英语

NI期刊 ; NI论文

通讯

Ministry of Science and Technology of China["2022YFA1403103","2017YFA0302902"] ; National Natural Science Foundation of China["12141402","12004041","12274249"] ; Innovation Program for Quantum Science and Technology[2021ZD0302600] ; US Department of Energy, office of Basic Energy Sciences[DE-SC0012704]

Materials Science ; Physics

Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:001111820500002

AMER PHYSICAL SOC

PHYSICS

Web of Science

1.Beijing Acad Quantum Informat Sci, Beijing 100193, Peoples R China
2.Hefei Natl Lab, Hefei 230088, Peoples R China
3.Tsinghua Univ, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China
4.Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China
5.Tsinghua Univ, Natl Ctr Electron Microscopy Beijing, State Key Lab New Ceram & Fine Proc, Sch Mat Sci & Engn,Key Lab Adv Mat MOE, Beijing 100084, Peoples R China
6.Ji Hua Lab, Foshan 528200, Guangdong, Peoples R China
7.Brookhaven Natl Lab, Dept Condensed Matter Phys & Mat Sci, Upton, NY 11973 USA
8.RIKEN Ctr Emergent Matter Sci CEMS, Saitama 3510198, Japan
9.Southern Univ Sci & Technol, Shenzhen 518055, Peoples R China

Zhu, Yuying,Wang, Heng,Wang, Zechao,et al. Persistent Josephson tunneling between Bi2Sr2CaCu2O8+x flakes twisted by 45° across the superconducting dome[J]. PHYSICAL REVIEW B,2023,108(17).

Zhu, Yuying.,Wang, Heng.,Wang, Zechao.,Hu, Shuxu.,Gu, Genda.,...&Xue, Qi-Kun.(2023).Persistent Josephson tunneling between Bi2Sr2CaCu2O8+x flakes twisted by 45° across the superconducting dome.PHYSICAL REVIEW B,108(17).

Zhu, Yuying,et al."Persistent Josephson tunneling between Bi2Sr2CaCu2O8+x flakes twisted by 45° across the superconducting dome".PHYSICAL REVIEW B 108.17(2023).