研究目的

To propose a new method of calculation of the mass operator in the Fourier image of Green’s function for the system of a three-level localized quasiparticle interacting with polarization phonons at T = 0 K, and to study the renormalized energy spectrum containing the complexes of bound-to-phonon states of the quasiparticle.

研究成果

The Feynman–Pines diagram technique is generalized for the calculation of the mass operator of a three-level localized quasiparticle interacting with polarization phonons at cryogenic temperature. The renormalized spectrum is calculated for resonant and non-resonant cases, showing that the spectrum varies significantly depending on whether the system is resonant or non-resonant. The study suggests that the revealed satellite groups of levels could significantly affect the functioning of quantum cascade lasers and detectors.

研究不足

The study is limited to a three-level localized quasiparticle interacting with polarization phonons at T = 0 K, and the coupling constants are assumed as known parameters. The method's applicability to systems with more levels or different types of phonons is not explored.