Topological Hall effect in magnetic topological insulator films

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:528

Article

Zhang, Jian-Xiao¹  Andreoli, Domenico²  Zang, Jiadong²  Liu, Chao-Xing¹ 

[1] Penn State Univ, Dept Phys, University Pk, PA 16802 USA

[2] Univ New Hampshire, Dept Phys, Durham, NH 03824 USA

关键词: Skyrmion;    Topological Hall effect;    Spin-orbit coupling;   

DOI  :  10.1016/j.jmmm.2020.167700

来源: Elsevier

【 摘 要 】

Geometric Berry phase can be induced either by spin-orbit coupling, giving rise to the anomalous Hall effect in ferromagnetic materials, or by chiral spin texture, such as skyrmions, leading to the topological Hall effect. Recent experiments have revealed that both phenomena can occur in topological insulator films with magnetic doping, thus providing us with an intriguing platform to study the interplay between these two phenomena. In this work, we report on a numerical simulation of the anomalous Hall and topological Hall effects in a four-band model that can properly describe the quantum well states in the magnetic topological insulator films by combining Landauer-Buttiker formula and the iterative Green's function method. Our numerical results suggest that spin-orbit coupling in this model plays a different role in the quantum transport in the clean and disordered limits. In the clean limit, spin-orbit coupling mainly influences the longitudinal transport but does not have much effect on topological Hall conductance. In the disordered limit, the longitudinal transport is determined by disorder scattering and spin-orbit coupling is found to affect strongly the topological Hall conductance. This sharp contrast unveils a dramatic interplay between spin-orbit coupling and disorder effect in topological Hall effect in magnetic topological insulator systems.

【 授权许可】

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