Hu Jiuning, Rigosi Albert F, Newell David B, Chen Yong P
National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA.
School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, USA.
Phys Rev B. 2020 Dec 15;102(23):235304. doi: 10.1103/PhysRevB.102.235304. Epub 2020 Dec 29.
Quantum Boltzmann formalism is employed to study the transport properties of strongly-coupled double layer systems that enable the formation of interlayer excitons and exciton condensation. The importance of exciton formation, dissociation, and condensation is highlighted in the context of thermoelectric power generation, and this mathematical inquiry provides an alternative methodology to calculate the thermoelectric efficiency given the conditions of exciton formation. The Onsager relation for the Coulomb drag resistivity is shown to be valid even when exciton condensation is present. In addition, it is found that the traditional thermoelectric figure of merit is no longer sufficient to predict the efficiency of thermoelectric power generation in the presented situations. This inquiry offers insights for designing double layer systems, including their interlayer interactions, with enhanced thermoelectric energy conversion efficiency.
采用量子玻尔兹曼形式理论来研究强耦合双层系统的输运性质，该系统能够形成层间激子和激子凝聚。在热电发电的背景下，强调了激子形成、解离和凝聚的重要性，并且这种数学探究提供了一种在激子形成条件下计算热电效率的替代方法。结果表明，即使存在激子凝聚，库仑拖拽电阻率的昂萨格关系仍然有效。此外，研究发现，传统的热电品质因数已不足以预测当前情况下热电发电的效率。该探究为设计双层系统（包括它们的层间相互作用）以提高热电能量转换效率提供了见解。
