Charge–density-wave and superconductivity in the two-dimensional Little model

As a non-phonon mechanism of superconductivity (SC), Little has proposed models in which the pairing force is induced by electronic polarization of molecules embeded in the conductor. Hirsch and Scalapino have studied a tight-binding model of this type in one dimension (1D) and have found that super...

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Bibliographic Details
Published in:Synthetic metals 2004-03, Vol.141 (1), p.39-42
Main Authors: Cheng, Ming, Su, W.P.
Format: Article
Language:English
Subjects:
Charge–density-wave
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure
Exact sciences and technology
Exciton mechanism
Physics
Properties of type I and type II superconductors
Superconductivity
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Summary:As a non-phonon mechanism of superconductivity (SC), Little has proposed models in which the pairing force is induced by electronic polarization of molecules embeded in the conductor. Hirsch and Scalapino have studied a tight-binding model of this type in one dimension (1D) and have found that superconductivity is dominated by charge–density-wave (CDW). We extend their calculations to two dimensions (2D). Our quantum Monte Carlo calculations suggest that the charge–density-wave formation is limited to a region close to half-filling. Outside of that superconductivity flourishes even in the presence of a finite onsite repulsion, demonstrating the Little model as a viable model for electronic mechanism of superconductivity. The results might be relevant to high-temperature superconductors.
ISSN:0379-6779
1879-3290
DOI:10.1016/j.synthmet.2003.10.025