【学术报告】Shichao Yan----Scanning tunneling microscopy and spectroscopy: from atomic spin dynamics to quantum materials

发布者:邢晓东发布时间:2016-06-29浏览次数:109

 

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) TiSeand  the first 1structured TMD superconductor 1T-CuxTiSe2. I  will talk about imaging the charge distribution in 1T-TiSeand  the influence of Cu doping in the CDW and electronic structure of  CuxTiSesample.  Furthermore, we extracted the electronic structures of both the valence and  conductance bands of CuxTiSeby  using quasiparticle interference imaging.

 

讲座地点:3104

讲座时间:2016629日下午4

邀请人:罗延安,张国权

  

欢迎老师和同学莅临。