局域化-非局域化转变对 Bi2Te2Se 拓扑绝缘体热电性能的影响

APL Energy Pub Date : 2024-01-19 DOI:10.1063/5.0173308
L. Craco, S. Leoni
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引用次数: 0

摘要

Bi2Te2Se 拓扑绝缘体的热传输特性显示出一系列复杂的特征。大体电阻率与突出的舒布尼科夫-德-哈斯量子振荡并存,以及与金属态的接近,标志着这种 p 带系统是一种非常规的拓扑量子材料。在这里,我们利用密度泛函加动态均场理论方法,展示了局域化-非局域化转变如何支撑了从室温到低温的热电响应的 T 依赖性。我们介绍了我们的多粒子分析对电阻率、塞贝克系数、热导率和洛伦兹数的影响,并提出接近电子跃迁的相关宽带系统在热电领域可能会有用武之地。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Effect of localization–delocalization transition on thermoelectric properties of Bi2Te2Se topological insulator
The thermal transport properties of Bi2Te2Se topological insulators show a range of complex features. Large bulk resistivities coexisting with prominent Shubnikov–de Haas quantum oscillations and proximity to metallic states mark this p-band system as an unconventional topological quantum material. Here, using the density functional plus dynamical mean-field theory method, we show how localization–delocalization transition underpins the T-dependence of thermoelectric responses from room down to low temperatures. We present the implications of our many-particle analysis to resistivity, Seebeck coefficient, thermal conductivity, and Lorenz number and propose that related broadband systems close to electronic transitions could be of use in thermoelectrics.
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