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Consider the time-periodical Hamiltonian $H(t)=H(t+T)$. In the Floquet theorem, the Schrödinger equation has a solution of the formbegin{align}|psi_alpha(t)rangle=e^{-iepsilon_alpha t}|phi_alpha(t)rangle,end{align}where $|phi_alpha(t)rangle=|phi_alpha(t+T)rangle$. This Floquet eigenstates...
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