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Filling dependence of correlation exponents and metal-Mott insulator transition in strongly correlated electron systems |
| Lin Ming-Xi(林明喜)a) and Qi Sheng-Wen(祁胜文)b)† |
| a College of Physics and Electronics, Shandong Normal University, Jinan 250014, China; b Department of Physics, Zhejiang Ocean University, Zhoushan 316000, China |
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Abstract Using a universal relation between electron filling factor and ground state energy, this paper studies the dependence of correlation exponents on the electron filling factor of one-dimensional extended Hubbard model in a strong coupling regime, and demonstrates that in contrast to the usual Hubbard model (gc=1/2), the dimensionless coupling strength parameter gc heavily depends on the electron filling, and it has a "particle–hole" symmetry about electron quarter filling point. As increasing the nearest neighbouring repulsive interaction, the single particle spectral weight is transferred from low energy to high energy regimes. Moreover, at electron quarter filling, there is a metal-Mott insulator transition at the strong coupling point gc=1/4, and this transition is a continuous phase transition.
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Received: 23 January 2010
Revised: 02 July 2010
Accepted manuscript online:
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PACS:
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71.10.Fd
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(Lattice fermion models (Hubbard model, etc.))
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71.27.+a
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(Strongly correlated electron systems; heavy fermions)
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71.30.+h
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(Metal-insulator transitions and other electronic transitions)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10774152), the Natural Science Foundation of Zhejiang Province of China (Grant No. Y1100088), and the Founding of Zhejiang Ocean University. |
Cite this article:
Lin Ming-Xi(林明喜) and Qi Sheng-Wen(祁胜文) Filling dependence of correlation exponents and metal-Mott insulator transition in strongly correlated electron systems 2010 Chin. Phys. B 19 127401
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