Heavy-Electron Formation and Polaron--Bipolaron Transition in the Anharmonic Holstein Model

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概要

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• The emergence of the bipolaronic phase and the formation of the heavy-electron state in the anharmonic Holstein model are investigated using the dynamical mean-field theory in combination with the exact diagonalization method. For a weak anharmonicity, it is confirmed that the first-order polaron--bipolaron transition occurs from the observation of a discontinuity in the behavior of several physical quantities. When the anharmonicity is gradually increased, the polaron--bipolaron transition temperature is reduced as well as the critical values of the electron--phonon coupling constant for polaron--bipolaron transition. For a strong anharmonicity, the polaron--bipolaron transition eventually changes to a crossover behavior. The effect of anharmonicity on the formation of the heavy-electron state near the polaron--bipolaron transition and the crossover region is discussed in detail.

• 2012-04-15

著者

• Ono Yoshiaki

  Department Of Geriatric Dentistry Osaka Dental University

• Hotta Takashi

  Department Of Neurological Surgery Sapporo Medical College And Hospital

• Fuse Takahiro

  Department of Physics, Niigata University, Niigata 950-2181, Japan

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