Broad and colossal edge supercurrent in Dirac semimetal Cd3As2 Josephson junctions

Chun-Guang Chu, Jing-Jing Chen, An-Qi Wang (), Zhen-Bing Tan (), Cai-Zhen Li, Chuan Li, Alexander Brinkman, Peng-Zhan Xiang, Na Li, Zhen-Cun Pan, Hai-Zhou Lu, Dapeng Yu and Zhi-Min Liao ()
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Chun-Guang Chu: Peking University
Jing-Jing Chen: Southern University of Science and Technology
An-Qi Wang: Peking University
Zhen-Bing Tan: Southern University of Science and Technology
Cai-Zhen Li: Southern University of Science and Technology
Chuan Li: University of Twente
Alexander Brinkman: University of Twente
Peng-Zhan Xiang: Peking University
Na Li: Peking University
Zhen-Cun Pan: Peking University
Hai-Zhou Lu: Southern University of Science and Technology
Dapeng Yu: Southern University of Science and Technology
Zhi-Min Liao: Peking University

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: Abstract Edge supercurrent has attracted great interest recently due to its crucial role in achieving and manipulating topological superconducting states. Proximity-induced superconductivity has been realized in quantum Hall and quantum spin Hall edge states, as well as in higher-order topological hinge states. Non-Hermitian skin effect, the aggregation of non-Bloch eigenstates at open boundaries, promises an abnormal edge channel. Here we report the observation of broad edge supercurrent in Dirac semimetal Cd3As2-based Josephson junctions. The as-grown Cd3As2 nanoplates are electron-doped by intrinsic defects, which enhance the non-Hermitian perturbations. The superconducting quantum interference indicates edge supercurrent with a width of ~1.6 μm and a magnitude of ~1 μA at 10 mK. The wide and large edge supercurrent is inaccessible for a conventional edge system and suggests the presence of non-Hermitian skin effect. A supercurrent nonlocality is also observed. The interplay between band topology and non-Hermiticity is beneficial for exploiting exotic topological matter.

Date: 2023
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DOI: 10.1038/s41467-023-41815-4

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