Berlin 2012 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 10: Focus Session "Topological Transport in Systems with broken Time Inversion Symmetry", Organization: Stefan Blügel (FZ Jülich)
MA 10.4: Hauptvortrag
Montag, 26. März 2012, 16:30–17:00, H 1012
Topological Hall effects of electrons and magnons — •Yoshinori Onose and Yoshinori Tokura — Department of Applied Physics, Universtiy of Tokyo, Tokyo, Japan
While the Hall effect is usually driven by the Lorentz force in an external magnetic field, it can also be induced by the Berry phase due to the topological structure of electronic and/or magnetic states. In this talk, we present two examples of such "topological" Hall effects. The first example is the topological Hall effect in Skyrmion crystal phase. Quite recently, the crystallization of Skyrmions, which are the topological magnetic textures with spin chirality, was found in B20 transition metal compounds such as MnSi and Fe1−xCoxSi[1]. In this talk, we present the Hall effect caused by the Berry phase originating from the topological spin arrangement of Skyrmion[2]. The second topic in this talk is our recent finding of the Hall effect of magnons. The Berry phase induced Hall effect is also expected for charge neutral particles such as magnons. Recently, we have succeeded in observing the magnon Hall effect in terms of thermal transport[3]. The effect of the lattice geometry for the magnon Hall effect will also be discussed.
These works were done in collaboration with X. Z. Yu, N. Kanazawa, T. Ideue, H. Katsura, Y. Shiomi, S. Ishiwata, D. Okuyama, S. Wakimoto, T. Arima, J. H. Han, K. Kakurai, and N. Nagaosa.
[1] X. Z. Yu, Y. Onose et al., Nature 465, 901 (2010). [2] N. Kanazawa, Y. Onose et al., Phys. Rev. Lett 106, 156603 (2011). [3] Y. Onose et al., Science 329, 297 (2010).