Back to Search Start Over

Proximity-Induced Superconductivity in Epitaxial Topological Insulator/Graphene/Gallium Heterostructures

Authors :
Li, Cequn
Zhao, Yi-Fan
Vera, Alexander
Lesser, Omri
Yi, Hemian
Kumari, Shalini
Yan, Zijie
Dong, Chengye
Bowen, Timothy
Wang, Ke
Wang, Haiying
Thompson, Jessica L.
Watanabe, Kenji
Taniguchi, Takashi
Hickey, Danielle Reifsnyder
Oreg, Yuval
Robinson, Joshua A.
Chang, Cui-Zu
Zhu, Jun
Publication Year :
2022

Abstract

The introduction of superconductivity to the Dirac surface states of a topological insulator leads to a topological superconductor, which may support topological quantum computing through Majorana zero modes. The development of a scalable material platform is key to the realization of topological quantum computing. Here we report on the growth and properties of high-quality (Bi,Sb)2Te3/graphene/gallium heterostructures. Our synthetic approach enables atomically sharp layers at both hetero-interfaces, which in turn promotes proximity-induced superconductivity that originates in the gallium film. A lithography-free, van der Waals tunnel junction is developed to perform transport tunneling spectroscopy. We find a robust, proximity-induced superconducting gap formed in the Dirac surface states in 5-10 quintuple-layer (Bi,Sb)2Te3/graphene/gallium heterostructures. The presence of a single Abrikosov vortex, where the Majorana zero modes are expected to reside, manifests in discrete conductance changes. The present material platform opens up opportunities for understanding and harnessing the application potential of topological superconductivity.<br />Comment: 19 pages, 4 figures, with a Supplemental Information. Comments are welcome

Details

Database :
arXiv
Publication Type :
Report
Accession number :
edsarx.2205.02806
Document Type :
Working Paper
Full Text :
https://doi.org/10.1038/s41563-023-01478-4