Effect of Correlation in the Peierls-Hubbard Model : Small Cluster Studies

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概要

• 論文の詳細を見る

• The effect of Coulomb interaction in the Su-Schrieffer-Heeger model for polyacetylene is studied by means of exact diagonalization of small clusters. We determine the amplitude of the ground-state dimerization very precisely to find that it has a maximum at U/t_0~2 or 3. This result is compared with the previous calculations. For the excitation spectrum it is shown that the gap for the lowest singlet excitation is roughly twice larger than that for the triplet excitation. This is interpreted in terms of a two-spinon bound state. The results in the large-U region are examined in the spin-Peierls Hamiltonian.

• 理論物理学刊行会の論文
• 1993-10-20

著者

• Ogata Masao

  Second Department Of Internal Medicine Oita Medical University

• OGATA Masao

  Joseph Henry Laboratories of Physics, Princeton University

• OGATA Masao

  Second Department of Internal Medicine, Oita Medical University

• OGATA Masao

  Institute for Solid State Physics, University of Tokyo

• OGATA Masao

  Theoretische Physik, ETH-Honggerberg : Interdisziplinares Projektzentrum fur Supercomputing, ETHZ

• OGATA Masao

  Joseph Henry Laboratories of Physics, Princeton University : Institute of Physics, College of Arts and Sciences, University of Tokyo

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