RIKEN Center for Emergent Matter Science Strong Correlation Physics Research Group

Group Director: Yoshinori Tokura (D.Eng.)

Japanese Page

Research Summary

Our group investigates a variety of emergent phenomena in strongly correlated electron systems, which cannot be understood within the framework of conventional semiconductor/metal physics, to construct a new scheme for the relevant science. In particular, we focus on transport and optical properties in non-trivial spin/orbital structures, aiming at clarifying the correlation between the responses and spin/orbital state. In addition, we investigate electron systems with strong spin-orbit interaction, unraveling its impact on transport phenomena and other electronic properties.

Main Research Fields

Mathematical & Physical Sciences

Related Research Fields

Interdisciplinary Science & Engineering
Chemistry

Keywords

strongly correlated electrons system
colossal magnetoresistance
high-temperature superconductors
multiferroics
topological insulators

Selected Publications

1.Ueda, K., Oh, T., Yang, B.-J., Kaneko, R., Fujioka, J., Nagaosa, N., and Tokura, Y.:
"Magnetic-field induced multiple topological phases in pyrochlore iridates with Mott criticality"
Nat. Comm. 8, 15515 (2017).
2.Shibata, K., Kovacs, A., Kiselev, N.S., Kanazawa, N., Dunin-Borkowski, R.E., and Tokura, Y:
"Temperature and Magnetic Field Dependence of the Internal and Lattice Structures of Skyrmions
by Off-Axis Electron Holography"
Phys. Rev. Lett. 118, 087202 (2017).
3.Kanazawa, N., Nii, Y., Zhang, X. -X., Mishchenko, A. S., De Filippis, G., Kagawa, F., Iwasa, Y., Nagaosa, N., and Tokura, Y.:
"Critical phenomena of emergent magnetic monopoles in a chiral magnet"
Nat. Commun. 7, 11622 (2016).
4.Ueda, K., Fujioka, J., Terakura, C., and Tokura, Y.:
"Pressure and magnetic field effects on metal-insulator transitions of bulk and domain wall states in pyrochlore iridates"
Phys. Rev. B 92, 121110(R) (2015).
5.Kurumaji, T., Ishiwata, S., and Tokura, Y.:
"Doping-Tunable Ferrimagnetic Phase with Large Linear Magnetoelectric Effect in a Polar Magnet Fe₂Mo₃O₈"
Physical Review X 5, 031034 (2015).
6.Ueda, K., Fujioka, J., Yang, B.-J., Shiogai, J., Tsukazaki, A., Nakamura, S., Awaji, S., Nagaosa, N., and Tokura, Y.:
"Magnetic Field-Induced Insulator-Semimetal Transition in a Pyrochlore Nd₂Ir₂O₇"
Phys. Rev. Lett. 115, 056402 (2015).
7.Shibata, K., Iwasaki, J., Kanazawa, N., Aizawa, S., Tanigaki, T., Shirai, M., Nakajima, T., Kubota, M., Kawasaki, M., Park, H. S., Shindo, D., Nagaosa, N., and Tokura, Y.:
"Large Anisotropic Deformation of Skyrmions in Strained Crystal"
Nature Nanotechnology 10, 589 (2015).
8.Tokura, Y., Seki, S., and Nagaosa, N.:
"Multiferroics of spin origin"
Rep. Prog. Phys. 77, 076501 (2014).
9.Nagaosa, N., and Tokura, Y.:
"Topological properties and dynamics of magnetic skyrmions"
Nat. Nanotechnol. 8, 899-911 (2013).
10.Shibata, K., Yu, X. Z., Hara, T., Morikawa, D., Kanazawa, N., Kimoto, K., Ishiwata, S., Matsui, Y., and Tokura, Y.:
"Towards control of the size and helicity of skyrmions in helimagnetic alloys by spin-orbit coupling"
Nat. Nanotechnol. 8, 723-728 (2013).