非简谐局域声子引起的电子质量增强
Electron Mass Enhancement due to Anharmonic Local Phonons
摘要：
为了理解电子有效质量是如何通过原子在由其他原子组成的笼中的非谐局域振荡而增强的，即，{ \it rattling}，我们用格林函数方法分析了非谐Holstein模型。由于电子质量增强因子$Z$的评估，我们发现，$Z$成为最大值时，零点能量是与潜在的高度，在振荡的振幅迅速扩大。这种量子效应和振动效应的协同作用被认为是解释振动系统中电子质量增强的一个关键问题。
英文摘要：
In order to understand how electron effective mass is enhanced by anharmonic local oscillation of an atom in a cage composed of other atoms, i.e., {\it rattling}, we analyze anharmonic Holstein model by using a Green's function method. Due to the evaluation of an electron mass enhancement factor $Z$, we find that $Z$ becomes maximum when zero-point energy is comparable with potential height at which the amplitude of oscillation is rapidly enlarged. Cooperation of such quantum and rattling effects is considered to be a key issue to explain the electron mass enhancement in electron-rattling systems.
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