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Current-induced skyrmion dynamics in constricted geometries
Junichi Iwasaki, Masahito Mochizuki, Naoto Nagaosa
Magnetic skyrmions, vortex-like swirling spin structures with quantized topological number, observed in chiral magnets, are appealing for potential applications in spintronics beca…
Theory of Electrical Spin Manipulation in Spin-Orbit Coupling Systems
Akihito Takeuchi, Naoto Nagaosa
By associating a spin-orbit interaction with a non-Abelian gauge potential, we theoretically present a spin polarization in a quite general form using an effective Yang-Mills field…
Theory of magnon-skyrmion scattering in chiral magnets
Junichi Iwasaki, Aron J. Beekman, Naoto Nagaosa
We study theoretically the dynamics of magnons in the presence of a single skyrmion in chiral magnets featuring Dzyaloshinskii-Moriya interaction. We show by micromagnetic simulati…
Spin-Seebeck effect on the surface of topological insulator due to nonequilibrium spin-polarization parallel to the direction of thermally driven electronic transport
Po-Hao Chang, Farzad Mahfouzi, Naoto Nagaosa +1
We study the transverse spin-Seebeck effect (SSE) on the surface of a three-dimensional topological insulator (TI) thin film, such as BiSe, which is sandwiched between two…
Edge States in Silicene Nanodisks
Ko Kikutake, Motohiko Ezawa, Naoto Nagaosa
Silicene is a honeycomb-structure silicon atoms, which shares many intriguing properties with graphene. Silicene is expected to be a quantum spin-Hall insulator due to its spin-orb…
Topological Phase Transition without Gap Closing
Motohiko Ezawa, Yukio Tanaka, Naoto Nagaosa
Topological phase transition is accompanied with a change of topological numbers. It has been believed that the gap closing and the breakdown of the adiabaticity at the transition…