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    题名: Quantum phonons and the Peierls transition temperature
    作者: Zheng, H.;Zhu, S. Y.;Chen, Wei- yeu
    贡献者: 淡江大學物理學系
    日期: 2002-01
    上传时间: 2013-07-09 15:22:30 (UTC+8)
    出版者: College Park: American Physical Society
    摘要: The effect of quantum phonons on the Peierls transition temperature in a one-dimensional commensurate system is studied. The nonadiabatic effect due to finite phonon frequency ωp>0 are treated through an energy-dependent electron-phonon scattering function δ(k′,k). By using the Green’s-function perturbation theory we have shown that our theory gives a good description of the effect of quantum phonons: (i) There exists a critical electron-phonon coupling gc2. The Peierls transition temperature Tp=0 when the coupling g2<gc2 and Tp increases with increasing g2>gc2. (ii) The ratio 2Δ/Tp could be much larger than the BCS value 3.527.
    關聯: Physical Review B (Condensed Matter and Materials Physics) 65(1), 014304(8 pages)
    DOI: 10.1103/PhysRevB.65.014304
    显示于类别:[物理學系暨研究所] 期刊論文


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