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Extended versus standard Holstein model: Results in two and three dimensions

机译:相对于标准Holstein模型的扩展:二维和三维结果

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We present numerically exact solutions to the problem of a single electron interacting through an extended interaction with optical phonons in two and three dimensions. Comparisons are made with results for the standard Holstein model and with perturbative approaches from both the weak coupling and strong coupling sides. We find, in agreement with earlier work, that the polaron effective mass increases (decreases) in the weak (strong) coupling regime, respectively. However, in two dimensions, the decrease in effective mass still results in too large an effective mass to be relevant in realistic models of normal metals. In three dimensions the decrease can be more relevant but exists only over a very limited range of coupling strengths.
机译:我们提出了一个精确的解决方案,用于解决单个电子通过与二维和三维二维声光子的扩展相互作用而相互作用的问题。将标准Holstein模型的结果与弱耦合和强耦合方面的摄动方法进行比较。我们发现,与早期的工作一致,极化子的有效质量在弱(强)耦合状态下分别增加(减少)。但是,在二维上,有效质量的降低仍然导致有效质量过大,无法与普通金属的实际模型相关。在三个方面,减小可能更有意义,但仅在非常有限的耦合强度范围内存在。

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