Andreev Bound States in Superconductor – Topological Insulator Nanowire Devices

by Prof. Junya Feng (冯军雅) (Institute of Physics, Chinese Academy of Sciences)

Tuesday 29 Sept 2026, 15:00 → 16:00 Asia/Shanghai

Tsung-Dao Lee Institute/N4F-N400 - meeting room (Tsung-Dao Lee Institute)

Host: Prof. Jianghua Ying  

Venue: TDLI Meeting Room N400

Tencent Meeting link:  https://meeting.tencent.com/dm/knd2lnOZMT2E

Meeting ID: 682389058, no password

 

Abstract:

Topological insulator nanowires (TINWs) proximitized by superconductors (SCs) provide a rich platform for exploring exotic quantum states and novel transport phenomena, with direct relevance to topological quantum computation. In this talk, we present a systematic study of Andreev bound states (ABSs) in BiSbTeSe₂-based TINWs, including long-range crossed Andreev reflection and flux-tunable ABSs. These results demonstrate that SC–TINW hybrid devices constitute a promising platform for Majorana physics. At the sub-millikelvin (sub-mK) station of the Synergetic Extreme Condition User Facility (SECUF), we have achieved a base temperature of 0.3 mK with large cooling power, magnetic fields of up to 16 T, and an ultra-low-noise measurement environment. Together, these capabilities offer an ideal platform for observing and manipulating quantum states, such as Majorana bound states, in SC–TINW hybrids and other topological quantum devices.

 

Biography:

Junya Feng, Associate Professor at the Institute of Physics, Chinese Academy of Sciences, and Head of the Sub-millikelvin Experimental Station of the Comprehensive Extreme Conditions Experimental Facility. He was selected for the "Outstanding Talent Recruitment Program (Category II)" of the Institute of Physics, Chinese Academy of Sciences. He received his bachelor's degree from the Department of Physics, Nanjing University in 2012 and his PhD in Physics from the University of Chinese Academy of Sciences in 2017. Afterwards, he pursued postdoctoral research at the University of Cologne in Germany. He joined the Huairou Research Division of the Institute of Physics, Chinese Academy of Sciences in October 2025.

His long-term research focuses on low-temperature transport studies of topological quantum devices. His research interests include ultra-low temperature technology, topological superconducting proximity effect, transport properties of topological materials and superconducting quantum bits. He has achieved systematic research results in the field of superconducting proximity effect of topological insulators. He is skilled in the construction of ultra-low temperature experimental platforms, micro-nano device fabrication and quantum transport measurement techniques. He has presided over or participated in multiple national research projects such as the General Program of the National Natural Science Foundation of China and the National Key R&D Program of China.