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Kevin Lee edited textbf_Time_reversal_invariant_topological__.tex
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\textbf{Time reversal invariant topological insulator:} Now we turned our discussion into another type of topological insulator, this kind of system respects the time reversal symmetry. First, we see some characteristics of time reversal operator, $T$.
"$T$" is an antiunitary operator, which means it can represented by a unitary operator and a complex conjugation operator. It can be shown that $T^2=\pm1$.