基于磁性拓扑绝缘体的非对称表面的热电制冷器
Thermoelectric refrigerator based on asymmetric surfaces of a magnetic topological insulator
摘要：
热电（TE）制冷（例如珀耳帖冷却器）使得电能能够直接转换热能的独特机会成为可能。在这里，我们提出了一个TE模块的制冷和发电模式，利用非对称表面的磁性拓扑绝缘体（量子反常霍尔绝缘体）与周期性阵列的中空填充有两个不同的绝缘体。基于玻尔兹曼输运理论，我们证明了其效率，即，在低于300 K的低温状态下，无量纲品质因数ZT超过1。所提出的装置可以用作在小规模冷却中需要精确温度控制的热管理装置。
英文摘要：
Thermoelectric (TE) refrigeration such as Peltier cooler enables a unique opportunity in electric energy to directly convert thermal energy. Here, we propose a TE module with both refrigeration and power generation modes by utilizing asymmetric surfaces of a magnetic topological insulator (quantum anomalous Hall insulator) with a periodic array of hollows filled with two different dielectrics. Based on the Boltzmann transport theory, we show that its efficiency, i.e., the dimensionless figure of merit ZT exceeds 1 in the low-temperature regime below 300 K. The proposed device could be utilized as a heat management device that requires precise temperature control in small-scale cooling.
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