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arXiv 0712.0366cond-mat.str-elcond-mat.mtrl-sci
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分子链中的电子-声子合作相互作用

Cooperative electron-phonon interaction in molecular chains

Sudhakar Yarlagadda

摘要:

利用受控的解析处理,我们推导出一个模型,一般描述合作强电子-声子相互作用(EPI)在一个带和两个带的Jahn-Teller(JT)系统。该模型包含{ \em次近邻}跳跃和近邻排斥。具有奇数个站点的环(O-环)与具有偶数个站点的环(E-环)相比属于不同的普适类。的e-环,在调谐排斥,经历一个戏剧性的不连续过渡到{ \em传导相称}电荷密度波(CDW)状态与填充独立的周期。

英文摘要:

Using a controlled analytic treatment, we derive a model that generically describes cooperative strong electron-phonon interaction (EPI) in one-band and two-band Jahn-Teller (JT) systems. The model involves a {\em next-nearest-neighbor} hopping and a nearest-neighbor repulsion. Rings with odd number of sites (o-rings) belong to a different universality class compared to rings with even number (e-rings). The e-rings, upon tuning repulsion, undergo a dramatic discontinuous transition to a {\em conducting commensurate} charge density wave (CDW) state with a period independent of filling.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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