Broad and colossal edge supercurrent in Dirac semimetal Cd3As2 Josephson junctions
Chun-Guang Chu, Jing-Jing Chen, An-Qi Wang, Zhen-Bing Tan, Caizhen Li, Chuan Li, Alexander Brinkman, Peng-Zhan Xiang, Na Li, Zhen-Cun Pan, Hai‐Zhou Lu, Dapeng Yu, Zhi‐Min Liao
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 Cd 3 As 2 -based Josephson junctions. The as-grown Cd 3 As 2 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.