Existence of a metallic phase in a 1D Holstein-Hubbard model at half filling

Date
2007
Authors
Krishna, P. M.
Chatterjee, A.
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Source Title
Physica C : Superconductivity and its Applications
Print ISSN
0921-4534
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Publisher
Elsevier B.V.
Volume
457
Issue
1-2
Pages
55 - 59
Language
English
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Abstract

The one-dimensional half-filled Holstein-Hubbard model is studied using a series of canonical transformations including phonon coherence effect that partly depends on the electron density and is partly independent and also incorporating the on-site and the nearest-neighbour phonon correlations and the exact Bethe-ansatz solution of Lieb and Wu. It is shown that choosing a better variational phonon state makes the polarons more mobile and widens the intermediate metallic region at the charge-density-wave-spin-density-wave crossover recently predicted by Takada and Chatterjee. The presence of this metallic phase is indeed a favourable situation from the point of view of high temperature superconductivity.

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