Centers & Labs

RIKEN Center for Emergent Matter Science

Topological Spintronics Research Unit

Unit Leader: Yuki Shiomi (D.Eng.)
Yuki  Shiomi(D.Eng.)

We conduct basic research on spin electronics (spintronics) from the standpoint of condensed matter physics to aim for the development of a new principle applicable to next-generation spintronics devices. We focus on spin current which is an important component in spintronic devices, and explore novel spin-current phenomena using physical concepts and materials discovered recently in the field of condensed matter physics. In particular, in order to maximize the effects of the spin-orbit interaction which is important for controlling the spin property in a substance, we exploit the mathematical concept of topology in our spintronics research (topological spintronics).

Main Research Field

Mathematical and physical sciences

Related Research Fields

Interdisciplinary science and engineering


  • Magnetism
  • Spintronics
  • Spin current
  • Topology
  • Berry phase

Selected Publications

Papers with an asterisk(*) are based on research conducted outside of RIKEN.
  1. *Shiomi, Y., Lustikova, J., and Saitoh E.:
    “Oscillatory Nernst effect in Pt|ferrite|cuprate-superconductor trilayer films”
    Sci. Rep. 7, 5358 (2017).
  2. *Hirobe, D., Sato, M., Kawamata, T., Shiomi, Y., Uchida, K., Iguchi, R., Koike,Y., Maekawa, S., and Saitoh E.:
    “One-dimensional spinon spin currents"
    Nature Phys. 13, 30-34 (2017).
  3. *Shomi Y., and Saitoh E.:
    “Paramagnetic spin pumping”
    Phys. Rev. Lett. 113, 266602 (2014) (Editors' suggestion).
  4. *Shiomi, Y., Nomura, K., Kajiwara, Y., Eto, K., Novak, M., Segawa, K., Ando, Y., and Saitoh E.:
    “Spin-electricity conversion induced by spin injection into topological insulators”
    Phys. Rev. Lett. 113, 196601 (2014).
  5. *Ishiwata, S., Shiomi, Y., Lee, J.S., Bahramy, M.S., Suzuki, T., Uchida, M., Arita, R., Taguchi, Y., and Tokura, Y.:
    “Extremely high electron mobility in a phonon-glass semimetal"
    Nature Materials 12, 512-517 (2013).
  6. *Shiomi, Y., Mochizuki, M., Kaneko, Y., and Tokura, Y.:
    "Hall effect of spin-chirality origin in a triangular-lattice helimagnet Fe1.3Sb"
    Phys. Rev. Lett. 108, 056601 (2012).
  7. *Shiomi, Y., Ishiwata, S., Taguchi, Y., and Tokura, Y.:
    "Mott-insulator to metal transition in filling-controlled SmMnAsO1-x"
    Phys. Rev. B.84, 054519 (2011) (Editor's suggestion).
  8. *Onose, Y., Ideue, T., Katsura, H., Shiomi, Y., Nagaosa, N., and Tokura Y.:
    "Observation of the Magnon Hall Effect "
    Science 329, 297 (2010)

Contact information

#131 Main Research Building,
2-1 Hirosawa,
Wako, Saitama
351-0198, Japan

Email: shiomi [at]