ISSN:
1572-9605
Keywords:
electron–phonon interactions
;
polaronic Hamiltonian
;
correlated electron systems
Source:
Springer Online Journal Archives 1860-2000
Topics:
Electrical Engineering, Measurement and Control Technology
,
Physics
Notes:
Abstract The effective fermionic Hamiltonian derived from the extended Hubbard–Holstein model by a sequence of “generalized displacement” and “squeezing” transformations, contains new, long-range, intersite charge interactions. By exact diagonalization on a four-site ring with equally spaced sites, followed by variational optimization of the energy, we obtain the phase diagrams for 2, 3, and 4 electrons by using interaction parameters expressed as functions of the interatomic distance. Depending on the filling, the new charge interaction can modify the phase diagram appreciably.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1026418828434
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