Quantum Energy Expectation in Periodic Time‐Dependent Hamiltonians via Green Functions
Abstract
Let UF be the Floquet operator of a time periodic Hamiltonian H(t). For each positive and discrete observable A (which we call a probe energy), we derive a formula for the Laplace time average of its expectation value up to time T in terms of its eigenvalues and Green functions at the circle of radius e1/T. Some simple applications are provided which support its usefulness.
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