Anharmonicity in One-Dimensional Electron–Phonon System
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概要
- 論文の詳細を見る
We investigate the effect of anharmonicity on the one-dimensional half-filled Holstein model by using the determinant quantum Monte Carlo method. By calculating the order parameters, we find that with and without anharmonicity, there is always a transition from a disorder phase to a dimerized phase. Moreover, in the dimerized phase, a lattice dimerization and a charge density wave coexist. The anharmonicity represented by the quartic term suppresses the dimerization as well as the charge density wave, while a double-well potential favors the dimerization. In addition, by calculating the correlation exponents, we show that the disorder phase is metallic with gapless charge and gapful spin excitations, and that both excitations are gapful in the dimerized phase.
- Physical Society of Japanの論文
- 2010-07-15
著者
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Zhao Jize
Institute For Solid State Physics University Of Tokyo
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Ueda Kazuo
Institiute For Solid State Physics University Of Tokyo
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Ueda Kazuo
Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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