电子与分子内和分子间振动模耦合对单晶有机半导体输运性质的影响
Effects of electron coupling to intra- and inter-molecular vibrational modes on the transport properties of single crystal organic semiconductors
摘要：
电子耦合到分子内和分子间的振动模式进行了研究，在适当的单晶有机半导体，如oligoacenes模型。重点是这些系统的光谱和传输特性超越微扰方法。不同耦合之间的相互作用强烈影响的温度带重正化，这是一个微妙的平衡的结果相反的趋势：由于与本地模式的相互作用，带变窄，由于电子耦合到非本地模式的带宽。该模型提供了一个准确的描述的迁移率作为温度的函数：事实上，它有正确的数量级，在低温下，它的规模作为幂律$T^{-δ}$的指数$δ$大于1，并在高温下，显示出跳跃行为与一个小的激活能。
英文摘要：
Electron coupling to intra- and inter-molecular vibrational modes is investigated in models appropriate to single crystal organic semiconductors, such as oligoacenes. Focus is on spectral and transport properties of these systems beyond perturbative approaches. The interplay between different couplings strongly affects the temperature band renormalization that is the result of a subtle equilibrium between opposite tendencies: band narrowing due to interaction with local modes, band widening due to electron coupling to non local modes. The model provides an accurate description of the mobility as function of temperature: indeed, it has the correct order of magnitude, at low temperatures, it scales as a power-law $T^{-δ}$ with the exponent $δ$ larger than unity, and, at high temperatures, shows an hopping behavior with a small activation energy.
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