Prof. Ting-Kuo Lee [Institute of Physics, Academia Sinica, Taiwan]

Title: Density waves in Cuprates  -- a theoretical study

Time: 2:00 - 3:00 PM, Thursday, May 12, 2016

Place: Auditorium Room 410, Building 6, HPSTAR (Shanghai)

Host: Dr. Xiaojia Chen

Abstract:

There is more experimental evidence that various charge density waves (CDW) observed in different cuprate families may be part of a new state with intertwined orders. Based on the well-known strongly correlated t-J model and by using a renormalized mean field theory, we obtain self-consistent solutions of a number of nearly degenerate these intertwined-order states. Besides CDW these orders could include pair density wave (PDW) and/or spin density wave (SDW).  PDW is like a FFLO state with finite momentum for the pairing order but it may or may not have superconducting long range order.    Spectra of one of these states without SDW will be discussed in detail and shown excellent agreement with ARPES and STS results of Cuprates. It provides a simple explanation of many novel properties like Fermi arcs, two different gaps, pseudogap, etc.

Biography of the Speaker:

2012‐ Director, Institute of Physics, Academia Sinica

2008‐ 2012 Executive Secretary, Academia Sinica Central Advisory Committee

2007‐ 2012 Director, Academic Affairs Office, Academia Sinica, Taipei, Taiwan

2004‐ Distinguished Research Fellow, Institute of Physics, Academia Sinica,

2001‐ Adjunct Professor, National Tsinghua University

1998‐ Adjunct Professor, National Taiwan University

2004‐2006 Executive Director, National Science and Technology Program for Nanoscience and Nanotechnology

1997‐2003 Head, Physics Division, National Center for Theoretical Sciences,Hsinchu, Taiwan

1996‐2004 Research Fellow, Institute of Physics, Academia Sinica, Taipei, Taiwan

1981‐1996 Faculty of Physics, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061

1979‐1981 Research Associate, Institute for Theoretical Physics, University of California, Santa Barbara, California

1975‐1979 Research Associate, Dept. of Physics, City College of City Univ. of New York, New York.