Unidirectional Seebeck effect in magnetic topological insulators

Abstract

We theoretically investigate the temperature gradient-dependent or unidirectional Seebeck effect (USE) in a magnetic/ nonmagnetic topological insulator (TI) heterostructure with in-plane magnetization in terms of the semiclassical electron dynamics and Fermi golden rule. The USE has a quantum origin arising from the magnon asymmetric scattering of surface Dirac electrons on TI. We discuss the USE in the heterostructures, Cr${}_x$(Bi${}_{1-y}$Sb${}_y$)${}_{2-x}$Te${}_3$/ (Bi${}_{1-y}$Sb${}_y{)}_2$Te${}_3$. The USE exhibits $\cos \varphi$-dependence (measured from $y$-direction) on the orientation of magnetization. It's found that the sign of USE stays unchanged when the system is transferred from $p$-doping to $n$-doping. The USE shows on inverse-linearly temperature dependent at high temperature.

arXiv comment11 pages, 4 figures

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Cited by in corpus (2)

• Hexagonal Warping Induced Nonlinear Planar Nernst Effect in Nonmagnetic Topological Insulators
• Unidirectional Seebeck effect from Rashba spin-orbit coupling on the subsurface of Ge(111)