Mobile exceptional points under cyclic modulation partition the Brillouin zone into switching domains that control band permutation after each cycle.
Heiss, Phases of wave functions and level repulsion, The European Physical Journal D7, 1 (1999)
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Mobile Exceptional Points Generate Momentum-Space Switching Domains
Mobile exceptional points under cyclic modulation partition the Brillouin zone into switching domains that control band permutation after each cycle.