Twisted van der Waals Josephson Junction Based on a High-Tc Superconductor

Lee, Jongyun; Lee, Wonjun; Kim, Gi-Yeop; Choi, Yong-Bin; Park, Jinho; Jang, Seong; Gu, Genda; Choi, Si-Young; Cho, Gil Young; Lee, Gil-Ho; Lee, Hu-Jong

doi:10.1021/acs.nanolett.1c03906

Twisted van der Waals Josephson Junction Based on a High-T_c Superconductor

Journal Article · Wed Dec 08 23:00:00 EST 2021 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.1c03906· OSTI ID:1839201

Lee, Jongyun ^[1]; Lee, Wonjun ^[1]; ^[1]; Choi, Yong-Bin ^[1]; Park, Jinho ^[1]; Jang, Seong ^[1]; ^[2]; ^[1]; Cho, Gil Young ^[3]; ^[4]; ^[1]

Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of); Inst. of Basic Science, Daejeon (Korea, Republic of); Asia Pacific Center for Theoretical Physics, Pohang (Korea, Republic of)
Pohang Univ. of Science and Technology (POSTECH) (Korea, Republic of); Asia Pacific Center for Theoretical Physics, Pohang (Korea, Republic of)

Stacking two-dimensional van der Waals (vdW) materials rotated with respect to each other show versatility for studying exotic quantum phenomena. In particular, anisotropic layered materials have great potential for such twistronics applications, providing high tunability. In this work, we report anisotropic superconducting order parameters in twisted Bi₂Sr₂CaCu₂O_8+x (Bi-2212) vdW junctions with an atomically clean vdW interface, achieved using the microcleave-and-stack technique. The vdW junctions with twist angles of 0° and 90° showed the maximum Josephson coupling, comparable to that of intrinsic Josephson junctions. As the twist angle approaches 45°, Josephson coupling is suppressed, and eventually disappears at 45°. The observed twist angle dependence of the Josephson coupling can be explained quantitatively by theoretical calculation with the d-wave superconducting order parameter of Bi-2212 and finite tunneling incoherence of the junction. Our results revealed the anisotropic nature of Bi-2212 and provided a novel fabrication technique for vdW-based twistronics platforms compatible with air-sensitive vdW materials.

View Accepted Manuscript (DOE)

Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Research Foundation of Korea (NRF); Samsung Science and Technology Foundation

Grant/Contract Number:: SC0012704

OSTI ID:: 1839201

Report Number(s):: BNL--222597-2022-JAAM

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 24 Vol. 21; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
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Twisted van der Waals Josephson Junction Based on a High-Tc Superconductor

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Twisted van der Waals Josephson Junction Based on a High-T_c Superconductor