Wierzbicki Michał, Barnaś Józef, Swirkowicz Renata
Faculty of Physics, Warsaw University of Technology, 00-662 Warszawa, Poland.
J Phys Condens Matter. 2015 Dec 9;27(48):485301. doi: 10.1088/0953-8984/27/48/485301. Epub 2015 Nov 13.
The effects of electron-electron and spin-orbit interactions on the ground-state magnetic configuration and on the corresponding thermoelectric and spin thermoelectric properties in zigzag nanoribbons of two-dimensional hexagonal crystals are analysed theoretically. The thermoelectric properties of quasi-stable magnetic states are also considered. Of particular interest is the influence of Coulomb and spin-orbit interactions on the topological edge states and on the transition between the topological insulator and conventional gap insulator states. It is shown that the interplay of both interactions also has a significant impact on the transport and thermoelectric characteristics of the nanoribbons. The spin-orbit interaction also determines the in-plane magnetic easy axis. The thermoelectric properties of nanoribbons with in-plane magnetic moments are compared to those of nanoribbons with edge magnetic moments oriented perpendicularly to their plane. Nanoribbons with ferromagnetic alignment of the edge moments are shown to reveal spin thermoelectricity in addition to the conventional one.
从理论上分析了电子-电子相互作用和自旋-轨道相互作用对二维六角晶体锯齿形纳米带基态磁构型以及相应的热电和自旋热电性质的影响。还考虑了准稳定磁态的热电性质。特别令人感兴趣的是库仑相互作用和自旋-轨道相互作用对拓扑边缘态以及拓扑绝缘体与传统带隙绝缘体状态之间转变的影响。结果表明，这两种相互作用的相互作用对纳米带的输运和热电特性也有显著影响。自旋-轨道相互作用还决定了面内易磁轴。将具有面内磁矩的纳米带的热电性质与具有垂直于其平面取向的边缘磁矩的纳米带的热电性质进行了比较。结果表明，具有边缘磁矩铁磁排列的纳米带除了具有传统的热电性外，还表现出自旋热电性。
