The anomalous Hall effect in magnetic topological insulators

Date: 8 October 2019

Venue: Campus Groenenborger, Building U, Room 244 - Groenenborgerlaan 171 - 2020 Antwerpen (route: UAntwerpen, Campus Groenenborger)

Time: 4:00 PM

Organization / co-organization: Condensed Matter Theory

Short description: Condensed Matter Theory lecture presented by Amir Sabzalipour

In 1879 Edwin H. Hall (Hall, 1879) discovered Hall effect. One year later, he reported that this effect was ten times larger in ferromagnetic iron (Hall, 1881) than in non-magnetic conductors. This second effect came to be known as the anomalous Hall effect (AHE). The AHE has been an enigmatic problem for almost a century. The main reason is that, an important contribution to the AHE arises from Berry curvature which has been formulated only in recent times. In this talk, I will talk about the AHE on the surface of a 3D magnetic topological insulator doped with magnetic and non-magnetic impurities. I will describe how three contributions to the AHE, the intrinsic Berry phase curvature effect, the side-jump effect and the skew scattering effects can be investigated through a modified semi-classical framework. The result demonstrates that the AHE can change sign by altering the orientation of the surface magnetization, the concentration of the impurities and also the position of the chemical potential, in agreement with recent experimental observations

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