论文标题
对非线性热电效应的内在贡献
Intrinsic Contribution to Non-linear Thermoelectric Effect
论文作者
论文摘要
对材料的强光照射会导致许多非线性效应，这对于了解系统激发态和光电子的物理学至关重要。在这里，我们研究了由于在非中心对称系统上应用的电场和热场引起的非线性热电效应。这种现象是在费米表面出现的，电子从价到传导带的过渡。我们得出了研究这些效应的形式，并发现这些效应中的非线性性（即非线性seebeck和非线性毛发效应）取决于非线性与线性电导率的比率。该理论对六角形扭曲和间隙的拓扑绝缘子进行了测试。结果表明，纵向和大厅对增加翘曲强度的影响增强，同时表现出与表面间隙相反的行为。
Irradiation of the strong light on the material leads to numerous non-linear effects that are essential to understand the physics of excited states of the system and for optoelectronics. Here, we study the non-linear thermoelectric effect due to the electric and thermal fields applied on a non-centrosymmetric system. The phenomenon arises on the Fermi surface with the transitions of electrons from valence to conduction bands. We derive the formlism to investigate these effects and find that the non-linearity in these effects namely non-linear Seebeck and non-linear Peltier effects depends on the ratio of the non-linear to the linear conductivities. The theory is tested for a hexagonally warped and gapped topological insulator. Results show enhancement in the longitudinal and Hall effects on increasing the warping strength while show opposite behavior with the surface gap.
