新葡萄88805官网“博约学术论坛”系列报告
第83期     (2016年第10期)

Title：Scanning tunneling microscopy and spectroscopy: from atomic spin dynamics to quantum materials
报告人：颜世超 博士 (University of Illinois at Urbana-Champaign)
时   间：6月27日（周一）下午2：00
地   点：中心教学楼610
ABSTRACT
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.

Curriculum Vitae
Shichao Yan is now a postdoctoral research associate in University of Illinois at Urbana-Champaign, United States. He received his B.Sc. degree in Material science and engineering from Shangdong University in 2006, and Ph.D. in condensed matter physics from the Institute of Physics, Chinese Academy of Sciences in 2012. During his Ph.D., he visited Wilson Ho’s group in University of California at Irvine in 2009. After graduation, he joined Max Planck Institute for the Structure and Dynamics of Matter and Max Planck Institute for Solid State Research from 2012-2015 as a postdoctoral researcher. Shichao Yan's current research is in the electronic structure of TMD by using low-temperature STM at the single-atom level. So far, he has published many papers in high impact journals including Nature Nanotechnology, ACS Nano, Nano Lett., etc.
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