日本理化学研究所Kimitoshi Kono 教授及台湾交通大学Juhn-Jong Lin教授学术报告通知

发布者:邢晓东发布时间:2016-06-15浏览次数:94

  

讲座题目一:Surface State  Electrons on liquid helium surface

  

演讲人:Kimitoshi Kono  教授

Team  Leader, Quantum Condensed Phases Research, RIKEN CEMS

 

Electrons  slowly approaching from outside to liquid helium surface cannot enter liquid He  because of large negative electron affinity of He atoms.  Rather, they form a  weak bound state in the vicinity of surface by the action of image charges of  individual electrons in front of the surface, the image charge which is  analogous to one induced at the metal surface, but the magnitude is very much  smaller. The surface state electrons on liquid helium is known to form the  Wigner solid, a pure electron lattice.  In this seminar, we report about  peculiar transport properties of the Wigner solid on a liquid He surface.  In  addition, the investigation of superfluid helium-3 surface by means of surface  state electrons and ions may be briefly mentioned.

 

讲座题目二:The Kondo Effect – from Spin to Orbital  Degrees of Freedom

  

演讲人:Juhn-Jong Lin教授

NCTU–RIKEN Joint Research Laboratory, Institute of  Physics

National Chiao Tung University (Taiwan)

  

The Kondo effect is a long-standing paradigmatic many-body problem in  condensed matter physics. The recent progresses in nanoscience and technology  has further made possible new realizations of exotic Kondo physics. In this  talk, I will discuss some experimental aspects of (1) the standard Kondo effect  due to the existence of isolated localized spin-half magnetic moments, and (2)  the two-impurity Kondo effect featured quantum critical behaviors of the  transport properties. (3) I will briefly discuss our observation of nonmagnetic  Kondo effect due to two-level tunneling systems. In this case, the Kondo physics  originates from the coupling of the electronic orbital wavefunctions with  dynamical structural defects.

  

References:

[1] A. M. Chang and J. C. Chen, Rep. Prog. Phys. 72, 096501 (2009).  (A review)

[2] S. S. Yeh and J. J. Lin, Phys. Rev. B 79, 012411 (2009); and to  be published.

  

作者简介:

Professor  Juhn-Jong Lin (林志忠)  received his BS degree from National Chiao Tung University (NCTU, 台灣交通大學)  in 1979, and his PhD degree from Purdue University (USA) in 1986. He was an  associate professor and a professor in the Department of Physics at National  Taiwan University from 1988 to 1997. He joined the Institute of Physics of NCTU  in 1997. His research efforts focus on low temperature physics, mesoscopic  physics, nanoscale physics, and disordered electronic systems. Website:  http://web.it.nctu.edu.tw/~jjlin/

  

讲座地点:3104

讲座时间:2016621日下午230

邀请人:张国权,曹学伟

 

欢迎老师和同学莅临。