Please use this identifier to cite or link to this item: http://repository.vnu.edu.vn/handle/VNU_123/27113
Title: Optical conductivity for a dimer in the dynamic Hubbard model
Authors: Bach, G. H.
Marsiglio, F
Keywords: HOLE SUPERCONDUCTIVITY;SUM-RULE;ENERGY;WEIGHT;STATE
Issue Date: 2012
Publisher: AMER PHYSICAL SOC, ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
Citation: ISIKNOWLEDGE
Abstract: The dynamic Hubbard model represents the physics of a multiband Hubbard model by using a pseudospin degree of freedom to dynamically modify the on-site Coulomb interaction. Here we use a dimer system to obtain analytical results for this model. The spectral function and the optical conductivity are calculated analytically for any number of electrons, and the distribution of optical spectral weight is analyzed in great detail. The impact of polaronlike effects due to overlaps between pseudospin states on the optical spectral weight distribution is derived analytically. Our conclusions support results obtained previously with different models and techniques: holes are less mobile than electrons.
Description: TNS06889 ; PHYSICAL REVIEW B Volume: 85 Issue: 15 Article Number: 155134 Published: APR 20 2012
URI: http://repository.vnu.edu.vn/handle/VNU_123/27113
ISSN: 1098-0121
Appears in Collections:Bài báo của ĐHQGHN trong Web of Science

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