时间：2025年4月24日（周四）下午14:00-15:30

Time: 14:00-15:30, Thur, Apr. 24th, 2025

主持人: 西湖大学理学院徐水钢博士

Host: Dr. Shuigang Xu, PI of School of Science, Westlake University

地址：西湖大学云谷校区E10-215教室

Venue: Room E10-215, Yungu Campus, Westlake University

语言：中文

Lecture Language: Chinese

Prof. Zheng Han（韩拯）

School of Physics, Shanxi University

主讲人/Speaker：

Zheng Vitto Han’s studies mainly focus on the emerging physical properties of functional materials in mesoscopic sizes, and on further implementing these interesting properties in future applications of nano-assemblies and nanoelectronics. In the past few years, he has revealed a series of exotic physical properties of such systems, with the related works published in journals including Nature, Nature Nanotechnology, Nature Communications.

摘要/Abstract:

It is well known that since the discovery of the quantum Hall effect in high-mobility two-dimensional electron gases in quantum wells over 40 years ago, the realization of the quantum Hall effect or fractional quantum Hall effect in two-dimensional electron systems remains very limited. Among them, the low-temperature ground state of high-mobility two-dimensional semiconductors is particularly difficult to realize, mainly due to the extremely challenging acquisition of Ohmic contacts. In this talk, we will introduce our latest progress in the stable and reliable preparation of low-temperature Ohmic contacts in N-type molybdenum disulfide field-effect transistors, where the quantum limit (filling factor of niu=1) can be achieved, and fractional quantum Hall effect (FQHE) under mK temperatures are observed. Our results suggest that high mobility MoS₂ transistors can play as a platform for future cryogenic temperature quantum electronic devices.

联系人/Contact:

School of Science, Changdan Liao Email: liaochangdan@westlake.edu.cn