Existence of a metallic phase in a 1D Holstein-Hubbard model at half filling
Date
2007
Authors
Krishna, P. M.
Chatterjee, A.
Advisor
Instructor
Source Title
Physica C : Superconductivity and its Applications
Print ISSN
0921-4534
Electronic ISSN
Publisher
Elsevier B.V.
Volume
457
Issue
1-2
Pages
55 - 59
Language
English
Type
Article
Journal Title
Journal ISSN
Volume Title
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.
Course
Other identifiers
Book Title
Keywords
Carrier concentration, Coherent light, Correlation methods, Phase transitions, Phonons, Polarons, Coherence effects, Metallic phase, Phonon correlation, Spin density, Hubbard model