Abstract:

In this talk, a brief review of the quantum Hall effect will be given with emphasis on its relevance to the topological order. It follows an introduction to spin physics in the fractional quantum Hall regime, in which the competition between electron-electron interaction and Zeeman energy gives rise to extraordinarily rich phenomena. Some of the latest developments in the spin physics in the half-filled Landau levels will be discussed, including the spin polarization of the 5/2 state, which has been argued to be a basis for topological quantum computation. Finally, recent progress in 3D topological insulators will be presented. In particular, field effect devices based on bismuth selenide (Bi2Se3) developed in Dan Tsui Laboratory will be described in detail.
 
 
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