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D-Wave Kondo Problem in a Square Tight-Bounding Lattice
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YANG Kai-Hua1;SONG Bo2;WANG Yu-Peng2;HAN Ru-Shan3 |
1Institute of Microelectronics, Peking University, Beijing 100871
2Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080
3Department of Physics, Peking University, Beijing 100871
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Cite this article: |
YANG Kai-Hua, SONG Bo, WANG Yu-Peng et al 2002 Chin. Phys. Lett. 19 111-113 |
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Abstract A Kondo model in a square tight-bonding lattice of conduction electrons is considered. The Kondo interaction takes a d-wave. Using mean-field theory and numerical simulations, it is found that there is a pseudo-gap for the impurity density of states at the Fermi level. Numerical results also show that the exponents of the low-temperature thermodynamic quantities are non-universal but dependent on the interaction.
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Keywords:
71.15.Fv
75.30.Hx
71.23.-k
05.70.-a
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Published: 01 January 2002
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