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Exciton Excitations in a One-Dimensional Band Insulator with Hubbard Interactions |
| GU Bo1,2;LOU Ji-Zhong3;QIN Shao-Jing2;XIANG Tao2,4 |
| 1Department of Physics, Peking University, Beijing 100871
2Institute of Theoretical Physics, Chinese Academy of Sciences, PO Box 2735, Beijing 100080
3PHP Institute for Bioengineering and Bioscience, Georgia Institute of Technology, 315 First Drive, Atlanta, GA 30332-0363, USA
4Interdisciplinary Center of Theoretical Studies, Chinese Academy of Sciences, PO Box 2735, Beijing 100080 |
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| Cite this article: |
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GU Bo, LOU Ji-Zhong, QIN Shao-Jing et al 2004 Chin. Phys. Lett. 21 530-533 |
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Abstract We study the properties of exciton excitations in the Hubbard model with alternating potential and dimerized hopping terms at half-filling. With increasing Coulomb repulsion, we find that a spin triplet exciton band develops below the band gap. At certain critical interaction, the excitation gap of this exciton band vanishes and a new phase with a dimerized ground state emerges. The value of this critical Coulomb interaction is determined perturbatively.
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| Keywords:
71.30.+h
71.10.Pm
71.35.Lk
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Published: 01 March 2004
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| PACS: |
71.30.+h
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(Metal-insulator transitions and other electronic transitions)
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71.10.Pm
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(Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.))
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71.35.Lk
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(Collective effects (Bose effects, phase space filling, and excitonic phase transitions))
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