振动分子量子点的非平衡热电输运
Nonequilibrium thermoelectric transport through vibrating molecular quantum dots
摘要：
利用泛函重整化群方法研究了声子隧穿效应对耦合到电子引线的单能级分子量子点的非平衡稳态输运的影响。在无自旋Anderson-Holstein模型的框架内，我们着重研究了小到中等的电子-声子耦合，并探讨了从绝热极限到反绝热极限以及从低温非微扰区到高温微扰区的演化.我们确定的声子签名的偏置电压依赖的电流和微分电导。考虑到电子引线之间的温度梯度，我们进一步研究了电荷和热量的传输之间的相互作用。在线性响应范围内，我们将各种热电系数的温度依赖性与我们在数值重整化群[Phys.~修订版~ B { \bf 96}，195156（2017）]。除了线性响应制度，在热电发电机的背景下，我们讨论了分子振动对输出功率和效率的影响。我们发现，分子的能量耗散，这是不可避免的声子的存在下，显着抑制在反绝热极限导致的热电效率的提高。
英文摘要：
We employ the functional renormalization group to study the effects of phonon-assisted tunneling on the nonequilibrium steady-state transport through a single level molecular quantum dot coupled to electronic leads. Within the framework of the spinless Anderson-Holstein model, we focus on small to intermediate electron-phonon couplings, and we explore the evolution from the adiabatic to the antiadiabatic limit and also from the low-temperature non-perturbative regime to the high temperature perturbative one. We identify the phononic signatures in the bias-voltage dependence of the electrical current and the differential conductance. Considering a temperature gradient between the electronic leads, we further investigate the interplay between the transport of charge and heat. Within the linear response regime, we compare the temperature dependence of various thermoelectric coefficients to our earlier results obtained within the numerical renormalization group [Phys.~Rev.~B {\bf 96}, 195156 (2017)]. Beyond the linear response regime, in the context of thermoelectric generators, we discuss the influence of molecular vibrations on the output power and the efficiency. We find that the molecular energy dissipation, which is inevitable in the presence of phonons, is significantly suppressed in the antiadiabatic limit resulting in the enhancement of the thermoelectric efficiency.
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