讲座题目：Scanning tunneling microscopy and spectroscopy: from atomic spin dynamics to quantum materials
演讲人：Shichao Yan，博士
1. University of Illinois at Urbana-Champaign, USA
2. Max Planck Institute for the Structure and Dynamics of Matter, 22761 Hamburg, Germany
摘要：
Scanning tunneling microscopy and spectroscopy is a powerful technique for applications ranging from nanoscience to quantum materials. In the first part of my talk, I will report exploring single-atom or few-atom nanomagnets with low-temperature and high magnetic field scanning tunneling microscopy (STM). By combining all electronic pump-probe technique with STM, we measured the spin dynamics of artificially constructed atomic nanomagnets down to a few nanoseconds time resolution. We found that the spin dynamics of the nanomagnets could be fully controlled by tuning the atomic exchange coupling with the magnetic STM tip. In addition, we demonstrate that the atomic nanomagnets can be used as quantum spin sensors to sense the atomic scale spin environments.
In the second part of my talk, I will talk about using low-temperature STM to study the charge density wave (CDW) and superconducting materials. We focused on the 1T-structured transition metal dichalcogenide (TMD) TiSe2 and the first 1T structured TMD superconductor 1T-CuxTiSe2. I will talk about imaging the charge distribution in 1T-TiSe2 and the influence of Cu doping in the CDW and electronic structure of CuxTiSe2 sample. Furthermore, we extracted the electronic structures of both the valence and conductance bands of CuxTiSe2 by using quasiparticle interference imaging.
讲座地点：3教104室
讲座时间：2016年6月29日下午4点
邀请人：罗延安，张国权
欢迎老师和同学莅临。