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Room-Temperature Thermoelectric Conversion by Dipole-Enhanced Rashba Spin-Orbit Coupling
Cell Reports Physical Science ( IF 8.9 ) Pub Date : 2020-12-30 , DOI: 10.1016/j.xcrp.2020.100284
Xuefei Duan , Ji-Chang Ren , Xiaowei Zhang , Shuang Li , Wei Liu

The development of the Internet of Things requires devices that are light, wireless, and wearable. With no cable for power and limited space for a battery, powering these devices becomes a daunting challenge. Wearable devices that are self-powered through harvesting heat from surroundings may address this challenge; however, conventional thermoelectric materials suffer either from poor mechanical stability or low room-temperature conversion efficiency. Based on density functional theory and Boltzmann transport calculations, we propose that monolayer WSTe promises a wearable thermoelectric material that exploits the synergic effects between the Rashba-type spin-orbit coupling and out-of-plane electric dipole. The maximum calculated room-temperature ZT value reaches 0.41, which is among the best 2D wearable thermoelectrics. Moreover, monolayer WSTe should possess an in-plane stiffness of ∼100 N/m and a fracture point up to 25%. Our study may shed light on the synergistic effects of electric dipole and Rashba spin-splitting on thermoelectric conversion for wearable electronics.



中文翻译:

偶极增强型Rashba自旋轨道耦合在室温下进行热电转换

物联网的发展需要轻便,无线和可穿戴的设备。没有电源线和电池的有限空间,为这些设备供电将成为一项艰巨的挑战。通过从周围环境中收集热量自行供电的可穿戴设备可能会解决这一挑战。但是,传统的热电材料要么具有较差的机械稳定性,要么具有较低的室温转换效率。基于密度泛函理论和玻尔兹曼输运计算,我们认为单层WSTe有望成为一种可利用的热电材料,该材料利用Rashba型自旋轨道耦合与平面外电偶极子之间的协同效应。计算得出的最大室温ZT值达到0.41,是最佳的2D可穿戴热电器件之一。此外,单层WSTe的面内刚度应约为100 N / m,断裂点应高达25%。我们的研究可能揭示了偶极子和Rashba自旋分裂对可穿戴电子设备热电转换的协同作用。

更新日期:2021-01-20
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