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Oct 13, 2012 at 0:26 comment added Xiao-Gang Wen " topological insulator cannot be defined in magnetic field" means that in magnetic field, topological insulator and trivial band insulator become the same phase. This does not prevent people to study Maxwell equation in such phase.
Oct 12, 2012 at 4:50 comment added Timothy Hi Prof. Wen, thanks for your answer. If topological insulator cannot be defined in magnetic field, why Qi's paper "topological field theory of time-reversal insulators" still studies the Maxwell equations in topological insulators?
Sep 11, 2012 at 14:31 comment added Machine Thank you for your answer! But it may not be too bad with a finite magnetic field.
Sep 11, 2012 at 13:54 vote accept Machine
Sep 9, 2012 at 3:46 history edited Xiao-Gang Wen CC BY-SA 3.0
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Sep 8, 2012 at 8:43 history answered Xiao-Gang Wen CC BY-SA 3.0