Jahn-Teller声子诱导多带超导的弱耦合理论
Weak-Coupling Theory for Multiband Superconductivity Induced by Jahn-Teller Phonons
摘要：
在弱耦合极限下讨论了呼吸声子和Jahn-Teller声子耦合的双带系统的超导电性。使用标准的量子力学程序，声子介导的吸引力。通过对包含这种引力的模型的分析，得到了一个类似BCS的超导转变温度公式$T_{\rm c}$。当只考虑呼吸声子时，$T_{\rm c}$与单带模型的结果相同。另一方面，当Jahn-Teller声子是活跃的，$T_{\rm c}$显着增强的带间吸引力，即使在弱耦合的限制。本结果的实际材料，如铁pnictides的相关性进行了简要评论。
英文摘要：
Emergence of superconductivity in a two-band system coupled with breathing and Jahn-Teller phonons is discussed in a weak-coupling limit. With the use of a standard quantum mechanical procedure, the phonon-mediated attraction is derived. From the analysis of the model including such attraction, a BCS-like formula for a superconducting transition temperature $T_{\rm c}$ is obtained. When only the breathing phonon is considered, $T_{\rm c}$ is the same as that of the one-band model. On the other hand, when Jahn-Teller phonons are active, $T_{\rm c}$ is significantly enhanced by the interband attraction even within the weak-coupling limit. Relevance of the present result to actual materials such as iron pnictides is briefly commented.
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