Electron-phonon interaction in the t-J model.

Electron-phonon interaction in the t-J model.
复制标题

t-J 模型中的电子-声子相互作用。

DOI:
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发表时间:
2003
影响因子:
8.6
通讯作者:
O. Gunnarsson
O. Gunnarsson
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
O. Rösch;O. Gunnarsson

文献摘要

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从三带模型出发,考虑声子对跳跃积分和库仑积分的调制,导出了一个考虑电子-声子耦合的t-J模型。虽然跳跃积分的调制占主导地位,但库仑积分的调制也不能忽略。该模型解释了实验观察到的异常软化的半呼吸模式时掺杂和较弱的软化的呼吸模式。结果表明,其他声子没有强烈的影响,特别是,耦合到一个屈曲模式是不强的,在这个模型中。
We derive a t-J model with electron-phonon coupling from the three-band model, considering modulation of both hopping and Coulomb integrals by phonons. While the modulation of the hopping integrals dominates, the modulation of the Coulomb integrals cannot be neglected. The model explains the experimentally observed anomalous softening of the half-breathing mode upon doping and a weaker softening of the breathing mode. It is shown that other phonons are not strongly influenced, and, in particular, the coupling to a buckling mode is not strong in this model.