The SDW-CDW Phase Transition in the One Dimensional Extended Hubbard Model

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概要

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• We study the SDW-CDW phase transition in the one dimensional extended Hubbard model at a half-filling. A scaling analysis using the resonating Hartree-Fock method with the numbers of electrons from 8 to 20 strongly suggests that the ground state is many-fold degenerate(1A1+, 1B1+, 3A2-, and 3B2- states) in the SDW region while it is doubly degenerate(1A1+ and 1B2- states) in the CDW region. Only the 1A1+ state makes a continuous phase transition from the SDW state to the CDW one. The 1B1+, 3A2-, and 3B2- states cross the 1B2- state around the phase boundary.We show that the continuous phase transition in the 1A1+ state is brought about by defects connecting the SDW-CDW domains called halfons. The correlation structures of these states are shown to clarify the origin of the degeneracies of the ground states.

• Physical Society of Japanの論文
• 1996-01-15

著者

• Fukutome Hideo

  Department Of Physics Faculty Of Science Kyoto University

• Ikawa Atsushi

  Department Of Chemistry Graduate School Of Science Kyoto University

• Ikawa Atsushi

  Department of Physics, Faculty of Science, Kyoto University,

• Tomita Norikazu

  Kyoto 606

• Fukutome Hideo

  Department of Physics, Faculty of Science, Kyoto University,

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