
主 持 人:姚道新 教授
报告摘要:Semiconductor-superconductor hybrid quantum devices have been extensively explored for revealing new, exotic physics in condensed matter and for potential applications in superconductor electronics and quantum computing technologies. In this talk, I will review our recent effort on experimental studies of semiconductor Josephson junction (JJ) devices towards topological quantum computing. The devices were made from strong spin-orbit coupled semiconductor nanostructures [1-5], grown by molecular beam epitaxy (MBE) [6-9], and s-wave superconductor Al, and were studied by quantum transport measurements in dilution refrigerators equipped with a uniaxial or a three-dimensional vector magnet and with an attenuated high-frequency transmission cable setup for microwave irradiation. After a brief overview of the physics of semiconductor JJ devices we have studied in recent years, including, e.g., complex quantum phase transition and anomalous negative magnetoresistance in semiconductor quantum-dot JJs [10,11], I will focus on our latest results obtained in the studies of Al-InAs nanowire-Al JJs [2], Al-InAs nanosheet-Al JJs [1,4] and Al-InSb nanosheet-Al JJs [5] under microwave irradiation. A perspective of these works towards topological quantum computing will be discussed.
报告人简历:徐洪起,北京大学讲席教授,北京量子信息科学研究院首席科学家。美国物理学会会士(APS Fellow),日本应用物理学会外籍会士(JSAP Fellow International)。1991年在瑞典Lund大学博士毕业,获理学博士学位。1991至1993年在瑞典Linkoping大学从事博士后研究。1993年获聘返回瑞典Lund大学工作,期间于1995年获授Docent学衔,历任助理教授 (1995-2001)、副教授 (2001-2003)、教授(2003-2014)及客座访问教授(2015-)。2010年受聘入职北京大学任讲席教授并于2017年至2025年期间担任北京大学“固态量子器件北京市重点实验室”主任。2021年受聘在北京量子信息科学研究院任首席科学家,并于2021年至2025年兼任量子计算部执行部长。
目前的研究方向包括量子结构中电子输运的实验与理论研究、拓扑物态、强关联体系、半导体自旋物理与自旋量子比特,以及用于拓扑量子器件和量子计算的半导体–超导复合体系。