SU(2) Coherent State Path Integral Investigation of the Holstein Dimer
T. Hakio─člua, V.A. Ivanovb and M.Ye. Zhuravlevb
a Bilkent University, Department of Physics, 06533 Ankara, Turkey
b N.S. Kurnakov Institute of General and Inorganic Chemistry of the RAS, 117907 Moscow, Russia
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The SU(2) coherent state path integral is used to investigate the partition function of the Holstein dimer. This approach naturally takes into account the dynamical symmetry of the model. The ground-state energy and the number of the phonons are calculated as functions of the parameters of the Hamiltonian. The renormalizations of the phonon frequency and electron hopping for bonding and antibonding states are considered. The destruction of quasiclassical mean field solution is discussed.
DOI: 10.12693/APhysPolA.97.927
PACS numbers: 03.65.Db, 71.36.+c, 64.60.Ak