Dai Ye-Bin, Luo Kai, Wang Xue-Feng
Jiangsu Key Laboratory of Thin Films, School of Physical Science and Technology, Soochow University, 1 Shizi Street, Suzhou, 215006, China.
Sci Rep. 2020 Jun 4;10(1):9105. doi: 10.1038/s41598-020-66073-y.
We have studied the charge and spin thermopower systematically in a ferromagnetic junction of graphene-like zigzag nanoribbon modified by two on-site disorders in the tight-binding model. Symmetries of the transmission spectra and geometry configuration of the two disorders are important factors in determining the thermoelectric properties of the system. Conditions to achieve pure charge and pure spin thermopower are discussed from the perspective of symmetry. Symmetry breaking is required sometimes to obtain large figure of merit. The type and strength of the disorders can be used to further manipulate the spin polarization of thermal current. Disorders inside nanoribbon instead of on edge can then be used to finely tune the performance of the junction. The results may have great application value in designing thermoelectric devices.
我们在紧束缚模型中，对由两种在位无序修饰的类石墨烯锯齿形纳米带的铁磁结中的电荷和自旋热功率进行了系统研究。两种无序的传输谱对称性和几何构型是决定系统热电性质的重要因素。从对称性角度讨论了实现纯电荷和纯自旋热功率的条件。有时需要对称性破缺来获得大的优值。无序的类型和强度可用于进一步操控热电流的自旋极化。纳米带内部而非边缘的无序可用于精细调节结的性能。这些结果在设计热电装置方面可能具有很大的应用价值。
