Proximity effect in PbTe-Pb hybrid nanowire Josephson junctions
Zitong Zhang, Wenyu Song, Yichun Gao, Yuhao Wang, Zehao Yu, Shuai, Yang, Yuying Jiang, Wentao Miao, Ruidong Li, Fangting Chen, Zuhan Geng,, Qinghua Zhang, Fanqi Meng, Ting Lin, Lin Gu, Kejing Zhu, Yunyi Zang, Lin Li,, Runan Shang, Xiao Feng, Qi-Kun Xue, Ke He, Hao Zhang
TL;DR
This paper demonstrates superconductivity induction in PbTe-Pb hybrid nanowires, showing gate-tunable supercurrents and a hard gap, which could advance Majorana research and quantum device development.
Contribution
It presents the first evidence of proximity-induced superconductivity in PbTe nanowires coupled with Pb, expanding the material platforms for Majorana and quantum applications.
Findings
Gate-tunable supercurrent observed in PbTe-Pb junctions
Hard superconducting gap demonstrated in tunneling regime
Potential for Majorana zero mode realization in new material system
Abstract
Semiconductor-superconductor hybrid nanowires are a leading material platform for the realization of Majorana zero modes. The semiconductors in previous studies are dominantly InAs or InSb. In this work, we show the induced superconductivity in a PbTe nanowire epitaxially coupled to a superconductor Pb. The Josephson junction device based on this hybrid reveals a gate-tunable supercurrent in the open regime and a hard superconducting gap in the tunneling regime. By demonstrating the superconducting proximity effect, our result can enable Majorana searches and other applications like gate-tunable qubits in a new semiconductor system.
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Taxonomy
TopicsPhysics of Superconductivity and Magnetism · Topological Materials and Phenomena · Cold Atom Physics and Bose-Einstein Condensates