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Article overview
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Heavy-Electron Formation and Bipolaronic Transition in the Anharmonic Holstein Model | Takahiro Fuse
; Yoshiaki Ono
; Takashi Hotta
; | Date: |
4 Oct 2011 | Abstract: | Emergence of bipolaronic phase and formation of heavy-electron state in the
anharmonic Holstein model are investigated with the use of the dynamical
mean-field theory in combination with an exact diagonalization method. For weak
anharmonicity, it is confirmed that the first-order bipolaronic transition
occurs from the observation of discontinuity in the behavior of several
physical quantities. When the anharmonicity is gradually increased, bipolaronic
transition temperature is suppressed and critical values of electron-phonon
coupling constant for bipolaronic transition are reduced. For strong
anharmonicity, the bipolaronic transition eventually changes to crossover
behavior. Effect of anharmonicity on the formation of heavy-electron state near
the bipolaronic transition and the crossover region is discussed in detail. | Source: | arXiv, 1110.0648 | Services: | Forum | Review | PDF | Favorites |
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