凝聚态物理
拉希巴效应
非谐性
塞贝克系数
热电材料
自旋(空气动力学)
热电效应
材料科学
物理
费米能级
简并能级
自旋电子学
铁磁性
量子力学
电子
热力学
作者
Lihua Wu,Jiong Yang,Shanyu Wang,Ping Wei,Jihui Yang,Wenqing Zhang,Lidong Chen
标识
DOI:10.1103/physrevb.90.195210
摘要
The Rashba effect is interesting for thermoelectrics because of the unique spin-splitting band structure. By using bulk BiTeI with a giant Rashba effect as an example, we prove that the spin-splitting-induced constant density of states leads to a two-dimensional thermopower. The thermopower is higher as compared with that in spin-degenerate bands, primarily due to the lower Fermi level in the Rashba spin-splitting bands at given carrier concentrations. A quantitative relation between thermopower and the Rashba parameter is established. Furthermore, the internal electric field in the Rashba system can be beneficial to bond anharmonicity and low lattice thermal conductivity. We suggest that bulk materials with large Rashba effect may become potential candidates for efficient thermoelectricity.
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