Abstract

The main directions of experimental studies of topological insulators based on bismuth and antimony chalcogenides, which are related to the possibility of using the properties of the surface states of Dirac fermions in thermoelectricity, have been considered. The results of studies of the Van der Waals interlayer surface (0001) in single-crystal layered films of solid solutions of n- and p-type conductivity with substitutions of atoms in Bi and Te sublattices performed by micro-Raman spectroscopy, scanning tunneling microscopy, and scanning tunneling spectroscopy have been discussed. The oscillations of galvanomagnetic effects in strong magnetic fields and thermoelectric properties measured under normal conditions and at high pressures have been analyzed. The compositions of solid solutions in which the contribution of the surface states of Dirac fermions increases because of an increase in the surface concentration of fermions and the Fermi velocity depending on the energy of the Dirac point, the value of the Seebeck coefficient, and the power parameter have been determined.

中文翻译：

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基于碲化铋的拓扑热电材料

摘要

已经考虑了基于铋和锑硫族化物的拓扑绝缘体的实验研究的主要方向，这与在热电中使用狄拉克费米子的表面态特性的可能性有关。n - 和p固溶体的单晶层状膜中范德华夹层表面 (0001) 的研究结果已经讨论了通过微拉曼光谱、扫描隧道显微镜和扫描隧道光谱进行的 Bi 和 Te 亚晶格中原子取代的 β 型电导率。分析了强磁场中电流磁效应的振荡和在正常条件下和高压下测量的热电特性。由于费米子的表面浓度和费米速度的增加，狄拉克费米子的表面态的贡献增加的固溶体组成取决于狄拉克点的能量、塞贝克系数的值和功率参数确定。