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Band effects on the conductivity for a two-band Hubbard model

  • Solid State and Materials
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Abstract

The band effects on the conductivity of a one-dimensional two-band Hubbard model is studied based on the ground state energy analysis. It is found that the system with filling factor one is a metal at zero temperature if the on-site interaction U is smaller than a critical value Uc, and is an insulator if U is larger than Uc. The value of metal-insulator transition point Uc is obtained. This result is different from that of 1D single-band Hubbard model where the quantum phase transition point Uc=0. Therefore, the orbital degree of freedom plays an essential role in the states of matter.

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Authors and Affiliations

  1. Department of Physics and Institute of Theoretical Physics, The Chinese University of Hong Kong, Hong Kong, P.R. China

    S.-J. Gu, Y. Liu & H.-Q. Lin

  2. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, P.R. China

    J. Cao & S. Chen

Authors
  1. S.-J. Gu
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  2. J. Cao
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  3. S. Chen
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  4. Y. Liu
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  5. H.-Q. Lin
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Correspondence to J. Cao.

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Gu, SJ., Cao, J., Chen, S. et al. Band effects on the conductivity for a two-band Hubbard model. Eur. Phys. J. B 66, 477–481 (2008). https://doi.org/10.1140/epjb/e2008-00462-8

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  • DOI: https://doi.org/10.1140/epjb/e2008-00462-8

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