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2017-12-11 Theory of the Valley and Spin Hall Effects Prof. Allan H. MacDonald (Department of Physics, The University of Texas at Austin)
Theory of the Valley and Spin Hall Effects

美國國家科學院院士 
Prof. Allan H.  MacDonald
                   (Department of Physics, The University of Texas at Austin) 
 

          2017/12/11 (Monday),12:00
           SC 353, Science Building III, NCTU.
          Host: Assistant Prof. Jung-Jung Su
 
Abstract: The Hall effect was discovered by Edwin Hall nearly 150 years ago and is now understood as an electronic transport effect that is always active when time reversal symmetry is broken. Recently there has been considerable interest in the valley and spin Hall effects, closely related phenomena related to Hall currents that flow in time-reversal invariant systems. Advances in developing practical hybrid magnetic/heavy-metal materials systems for magnetic state manipulation based on the spin-Hall effect have been especially exciting because of their promise for applications in magnetic information storage technology.
I will discuss the theories of the valley and spin Hall effects, which are complicated by imperfect conservation of spin and valley and by the possible importance of Berry phase effects in transport theory, placing emphasis on the many issues that are not well understood and the possibility of using conceptual advances in theory to improve technological possibilities.
 
※ Please register before 2017/12/8 (Fri.) 12:00.
https://goo.gl/jRv9GS 
 
Everyone is welcome!
 
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 Allan H. MacDonald
received the B.Sc. degree from St. Francis Xavier University, Antigonish, NS, Canada, in 1973 and the M.Sc. and Ph.D. degrees in physics from the University of Toronto, Toronto, ON, Canada, in 1974 and 1978, respectively.
   He was a member of the research staff of the National Research Council of Canada from 1978 to 1987 and has taught at Indiana University (1987– 2000) and the University of Texas at Austin, Austin (2000–present) where he now holds the Sid W. Richardson Chair in Physics. He has held visiting positions at the Swiss Federal Institute of Technology and the California Institute of Technology. He has contributed to research on the quantum Hall effect, electronic structure theory, magnetismand superconductivity, among a variety of other topics. He has more than 400 archival refereed publications and is now active in spintronics, cold atom, graphene, and quantum Hall physics research.
   Dr. MacDonald is a Fellow of the American Physical Society and a member of the American Academy of Arts and Sciences and has been awarded the Herzberg Medal (1987) and the Buckley Prize (2007).