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Title: From electron to small polaron: an exact cluster solution
Authors: Alexandrov, A.S.
Issue Date: 1994
Publisher: © American Physical Society
Citation: ALEXANDROV, A.S., 1994. From electron to small polaron: an exact cluster solution. Physical Review B, 49 (14), pp. 9915 - 9923
Abstract: We perform the exact diagonalization of two, four, and six vibrating molecules strongly coupled with one electron to show that a small polaron describes both adiabatic and nonadiabatic regimes. Electron spectra are derived and compared with the adiabatic Holstein approximation and with the Lang-Firsov canonical transformation in a wide range of the adiabatic parameter and the coupling strength. We show that the self-consistent Migdal approximation is violated at an intermediate value of the coupling constant λ≃1 and the adiabatic or nonadiabatic small polaron is the ground state for the intermediate and strong coupling λ>1. The phonon frequencies are calculated for a wide range of the coupling, including the intermediate region.
Description: This article was published in the journal Physical Review B [© American Physical Society]. The definitive version is available at: http://link.aps.org/doi/10.1103/PhysRevB.49.9915
Version: Published
DOI: 10.1103/PhysRevB.49.9915
URI: https://dspace.lboro.ac.uk/2134/4283
ISSN: 1098-0121
Appears in Collections:Published Articles (Physics)

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