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Abstract: The Feynman all-coupling variational approach for the polaron isre-formulated and extended using the Hamiltonian formalism with time-orderedoperator calculus. Special attention is devoted to the excited polaron states.The energy levels and the inverse lifetimes of the excited polaron states are,for the first time, explicitly derived within this all-coupling approach.Remarkable agreement of the obtained transition energies with the peakpositions of the polaron optical conductivity calculated using diagrammaticquantum Monte Carlo is obtained.



Author: S. N. Klimin, J. T. Devreese

Source: https://arxiv.org/



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