I was reading Hasan & Kane's review on topological insulators and right in the beginning, page 3, they say that the Bloch ground state is U(N) invariant. I do not see that. Would anyone be able to show it or point to a reference?(adsbygoogle = window.adsbygoogle || []).push({});

Thanks,

Jan.

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# Symmetry of the Bloch Ground State

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