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The calculations of the quasiparticle excitation spectra with damping for these models has been performed in the framework of the equation- of-motion method for two-time temperature Green’s Functions within a non-perturbative approach.
621, 165 (2016) )( ) ( ) Un Un = En Vn −h + λ V n • By solving this equation, we obtain the quasiparticle energies En and the matrices U and V which determine the generalized Bogoliubov quasiparticle transformation:
Quantum cooperative effects and quasiparticle dynamics in the basic microscopic models of quantum theory of magnetism:
Magnetic Polaron 55%
Quite generally, a self-consistent theory of a magnetic polaron is formulated within a nonperturbative many-body approach, the Irreducible Green Functions (IGF) method which is used to describe the quasiparticle many-body dynamics at finite temperatures.