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- Title
Renormalized energy of ground and 1rst excited state of Fröhlich polaron in the range of weak coupling.
- Authors
Tkach, M. V.; Seti, Ju. O.; Voitsekhivska, O. M.; Pytiuk, O. Yu.
- Abstract
Partial summing of in1nite range of diagrams for the two-phonon mass operator of polaron described by Fröhlich Hamiltonian is performed using the Feynman-Pines diagram technique. Renormalized spectral parameters of ground and 1rst excited (phonon repeat) polaron state are accurately calculated for a weak electron-phonon coupling at T Æ 0 K. It is shown that the stronger electron-phonon interaction shifts the energy of both states into low-energy region of the spectra. The ground state stays stationary and the excited one decays at a bigger coupling constant.
- Subjects
POLARONS; EXCITED states; QUASIPARTICLES; ELECTRON-phonon interactions; ENERGY-band theory of solids; ENERGY levels (Quantum mechanics)
- Publication
Condensed Matter Physics, 2015, Vol 18, Issue 3, p1
- ISSN
1607-324X
- Publication type
Article
- DOI
10.5488/CMP.18.33707