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首页> 外文期刊>Physical review. B, Condensed Matter And Materials Physics >Self-consistent theory of phonon renormalization and electron-phonon coupling near a two-dimensional Kohn singularity
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Self-consistent theory of phonon renormalization and electron-phonon coupling near a two-dimensional Kohn singularity

机译:二维Kohn奇点附近的声子重整化和电子-声子耦合的自洽理论

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摘要

We show that the usual expression for evaluating electron-phonon coupling and the phonon linewidth in two-dimensional metals with a cylindrical Fermi surface cannot be applied near the wave vector corresponding to the Kohn singularity. Instead, the Dyson equation for phonons has to be solved self-consistently. If a self-consistent procedure is properly followed, there is no divergency in either the coupling constant or the phonon linewidth near the offending wave vectors, in contrast to the standard expression.
机译:我们表明,用于评估具有圆柱形费米表面的二维金属中的电子-声子耦合和声子线宽的常用表达式不能应用于与Kohn奇异性相对应的波矢附近。取而代之的是,声子的戴森方程必须自洽求解。如果正确遵循自洽程序,则与标准表达式相比,在有害波矢附近的耦合常数或声子线宽都没有差异。

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