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Existence of an Intermediate Metallic Phase at the SDW-CDW Crossover Region in the One-Dimensional Holstein-Hubbard Model at Half-Filling
Author
Source
Advances in Condensed Matter Physics
Issue
Vol. 2010, Issue 2010 (31 Dec. 2010), pp.1-14, 14 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2010-03-10
Country of Publication
Egypt
No. of Pages
14
Main Subjects
Abstract EN
The Holstein-Hubbard model serves as a useful framework to investigate this interplay between the phonon-induced electron-electron attractive interaction and the direct Coulomb repulsion and can afford interesting phase diagrams due to competition among charge-density wave (CDW), spin-density wave (SDW), and superconductivity.
However the detailed nature of the CDW-SDW transition is still not very well known.
It is generally believed that the system undergoes a direct insulator to insulator transition from CDW to SDW with the increase of the on-site Coulomb repulsion for a given strength of the electron-phonon coupling and this is the main bottleneck for the polaronic/bipolaronic mechanism of high-temperature superconductivity.
We have recently made an investigation to study the nature of the transition from SDW phase to CDW phase within the framework of a one-dimensional Holstein-Hubbard model at half-filling using a variational method.
We find that an intervening metallic phase may exist at the crossover region of the CDW-SDW transition.
We have also observed that if the anharmonicity of the phonons is taken into account, this metallic phase widens and the polarons become more mobile, which is a more favorable situation from the point of view of superconductivity.
We shall finally show that an improved variational calculation widens the metallic phase and makes the polarons more mobile, which reconfirms the existence of the intermediate metallic phase at the SDW-CDW crossover region.
American Psychological Association (APA)
Chatterjee, Ashok. 2010. Existence of an Intermediate Metallic Phase at the SDW-CDW Crossover Region in the One-Dimensional Holstein-Hubbard Model at Half-Filling. Advances in Condensed Matter Physics،Vol. 2010, no. 2010, pp.1-14.
https://search.emarefa.net/detail/BIM-464941
Modern Language Association (MLA)
Chatterjee, Ashok. Existence of an Intermediate Metallic Phase at the SDW-CDW Crossover Region in the One-Dimensional Holstein-Hubbard Model at Half-Filling. Advances in Condensed Matter Physics No. 2010 (2010), pp.1-14.
https://search.emarefa.net/detail/BIM-464941
American Medical Association (AMA)
Chatterjee, Ashok. Existence of an Intermediate Metallic Phase at the SDW-CDW Crossover Region in the One-Dimensional Holstein-Hubbard Model at Half-Filling. Advances in Condensed Matter Physics. 2010. Vol. 2010, no. 2010, pp.1-14.
https://search.emarefa.net/detail/BIM-464941
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-464941