Strong coupling in thermoelectric nanojunctions: a reaction coordinate framework
Strong coupling in thermoelectric nanojunctions: a reaction coordinate framework
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热电纳米结中的强耦合：反应坐标框架
作者：
C. McConnell;A. Nazir
我们研究了一个由振动辅助隧穿驱动的热电纳米结模型。我们应用反应坐标形式推导出控制其热电性能超过弱电子-振动耦合极限的主方程。采用全计数统计，我们计算电流，热功率，相关噪声和效率，而不诉诸于弱振动耦合近似。我们展示了在强耦合下功率效率-精度权衡的复杂性，表明在我们的模型中这三者不能同时最大化。最后，我们强调了在考虑强耦合和多重环境时捕获非可加性的重要性，证明了环境的可加性处理可能违反卡诺施加的热电效率上限。
We study a model of a thermoelectric nanojunction driven by vibrationally-assisted tunnelling. We apply the reaction coordinate formalism to derive a master equation governing its thermoelectric performance beyond the weak electron-vibrational coupling limit. Employing full counting statistics we calculate the current flow, thermopower, associated noise, and efficiency without resorting to the weak vibrational coupling approximation. We demonstrate intricacies of the power-efficiency-precision trade-off at strong coupling, showing that the three cannot be maximised simultaneously in our model. Finally, we emphasise the importance of capturing non-additivity when considering strong coupling and multiple environments, demonstrating that an additive treatment of the environments can violate the upper bound on thermoelectric efficiency imposed by Carnot.