Quasienergy
= Quasienergy
{title2=$U_F|u_j\rangle=e^{-i\varepsilon_jT/\hbar}|u_j\rangle$}
A <quasienergy> is defined by an <eigenvalue> of the <Floquet operator>. It is determined modulo $2\pi\hbar/T$, because adding an integer multiple of that quantity leaves the <complex exponential> unchanged. A time-independent effective <Hamiltonian> can be defined by a branch of the <matrix logarithm>; its <eigenvalues> are the corresponding chosen <quasienergies>.