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Topic： Electron transport and emergent spin electrodynamics in ferromagnets with Rashba interaction Speaker： Gen Tatara 教授（RIKEN） Time： 10:00 am, November 24 Location：理科楼B315 Abstract: Recent topics related to electron transport in the presence of magnetization textures in ferromagnetic metals [1] are discussed focusing on the roles of an emergent effective elec-tromagnetic eld (spin gauge eld) that couples to electron spin [2]. The concept of spin electromagnetic eld was presented in the context of a voltage generated by a canting of a driven domain wall [3], and mathematically rigorous formulation in the adiabatic limit was given by Volovik [4]. The idea of effective gauge eld can be extended to the cases with spin relaxation [5], Rashba interaction [6, 7, 8, 9]. It was recently shown that an antisymmetric exchange interaction (Dzyaloshinskii{Moriya interaction) is caused by the spin gauge eld in the presence of intrinsic spin current [10]. Moreover, optical properties of Rashba conductors such as directional dichroism when a magnetic eld is applied turned out to be described by the effective gauge eld generated by the Rashba interaction [11, 12].
References
[1] G. Tatara, H. Kohno, and J. Shibata, Phys. Rep., 468,213 (2008).
[2] G. Tatara and N. Nakabayashi, J. Appl. Phys,, 115,172609 (2014).
[3] L. Berger, Phys. Rev. B, 33, 1572 (1986).
[4] G. E. Volovik, J. Phys. C: Solid State Phys., 20, L83 (1987).
[5] R. A. Duine, Phys. Rev. B, 77, 014409 (2008).
[6] A, Takeuchi and G, Tatara, J. Phys. Soc. Japan, 81, 033705 (2012).
[7] K.-W. Kim, et al., Phys. Rev. Lett., 108, 217202 (2012).
[8] G. Tatara, N. Nakabayashi, and K.-J. Lee, Phys. Rev. B, 87, 054403 (2013).
[9] N. Nakabayashi and G. Tatara, New J. Phys., 16, 015016 (2014).
[10] T. Kikuchi et al., Phys. Rev. Lett., 116, 247201 (2016).
[11] J. Shibata, et al., J. Phys. Soc. Japan, 85, 033701 (2016).
[12] H. Kawaguchi and G. Tatara, cond-mat arXiv:1610.01743.