Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 4: Transport: Topological Insulators 1 (jointly with HL and MA)

TT 4.4: Talk

Monday, March 26, 2012, 10:15–10:30, H 3010

Electromagnetically induced topological charge on the surface of a topological insulator due to magnetization dynamics — •Flavio Nogueira and Ilya Eremin — Institut für Theoretische Physik III, Ruhr-Universität Bochum, Universitätsstraße 150, 44801 Bochum, Germany

A topologically non-trivial solution of the Landau-Lifshitz-Gilbert equation is obtained. Such a solution induces electric and magnetic fields and implies a topological current at the surface of a topological insulator which is proportional to E·B. The values of the topological charge in our solution are Q=−1,0,1. The spin current density plays in this scenario the role of a non-Abelian gauge field and the topological charge is reminiscent of the ’t Hooft-Polyakov construction of the magnetic monopole. We discuss the physical consequences of our theory, including the role of topological spin transport on the surface of a topological insulator.