Centers & Labs

RIKEN Center for Emergent Matter Science

Strong Correlation Quantum Transport Research Team

Team Leader: Yoshinori Tokura (D.Eng.)
Yoshinori  Tokura(D.Eng.)

We aim to study various quantum transport phenomena which emerge in thin films, hetero-interfaces, and bulk samples. Specifically, we try to clarify the effects of spin-orbit interaction on the transport phenomena in the systems with broken inversion-symmetry, and electron transport in non-trivial spin textures, through the transport measurements under low temperature and high magnetic-field conditions. Unconventional superconductors are also investigated by means of resistivity measurement under high pressure as well as THz spectroscopy.

Main Research Field

Physics

Related Research Fields

Engineering / Materials Sciences

Research Subjects

  • Quantum transport phenomena in the systems with broken inversion-symmetry
  • Magneto-transport phenomena in non-trivial spin texture
  • Exotic superconductivity

Selected Publications

  1. Okada, K. N., Ogawa, N., Yoshimi, R., Tsukazaki, A., Takahashi, K. S., Kawasaki, M., and Tokura, Y.:
    "Enhanced photogalvanic current in topological insulators via Fermi energy tuning"
    Phys. Rev. B 93, 081403(R) (2016).
  2. Yamamoto, A., Takeshita, N., Terakura, C., and Tokura, Y.:
    "High pressure effects revisited for the cuprate superconductor family with highest critical temperature"
    Nature Commun. 6, 8990 (2015).
  3. Yamamoto, A., Hashizume, D., Bahramy, M. S., and Tokura, Y.:
    "Coexistence of monochalocogen and dichalocogen Ions in BiSe2 and BiS2 crystals prepared at high pressure"
    Inorganic Chemistry 54, 4114 (2015).
  4. Takahashi, Y., Chakraverty, S., Kawasaki, M., Hwang, H. Y., and Tokura, Y.:
    "In-plane terahertz response of thin film Sr2RuO4"
    Phys. Rev. B 89, 165116 (2014).
  5. Takeshita, N., Yamamoto, A., Iyo, A., and Eisaki, H.:
    "Zero-resistivity above 150 K in HgBa2Ca2Cu3O8+δ at high pressure"
    J. Phys. Soc. Jpn. 82, 023711 (2013).
  6. Murakawa, H., Bahramy, M. S., Tokunaga, M., Kohama, Y., Bell, C., Kaneko, Y., Nagaosa, N., Hwang, H. Y., and Tokura, Y.:
    "Detection of Berry's phase in a bulk Rashba semiconductor"
    Science 342, 1490 (2013).
  7. Chakraverty, S., Matsuda, T., Wadati, H., Okamoto, J., Yamasaki, Y., Nakao, H., Murakami, Y., Ishiwata, S., Kawasaki, M., Taguchi, Y., Tokura, Y., and Hwang, H. Y.:
    "Multiple helimagnetic phases and topological Hall effect in epitaxial thin films of pristine and Co-doped SrFeO3"
    Phys. Rev. B 88, 220405(R) (2013).
  8. Bordacs, S., Checkelsky, J. G., Murakawa, H., Hwang, H. Y., and Tokura, Y.:
    "Landau level spectroscopy of Dirac electrons in a polar semiconductor with giant Rashba spin splitting"
    Phys. Rev. Lett. 111, 166403 (2013).
  9. Chakraverty, S., Matsuda, T., Ogawa, N., Wadati, H., Ikenaga, E., Kawasaki, M., Tokura, Y., and Hwang, H. Y.:
    "BaFeO3 cubic single crystalline thin film: a ferromagnetic insulator"
    Appl. Phys. Lett. 103, 142416 (2013).
  10. Sakano, M., Bahramy, M. S., Katayama, A., Shimojima, T., Murakawa, H., Kaneko, Y., Malaeb, W., Shin, S., Ono, K., Kumigashira, H., Arita, R., Nagaosa, N., Hwang, H. Y., Tokura, Y., and Ishizaka, K.:
    "Strongly spin-orbit coupled two-dimensional electron gas emerging near the surface of polar semiconductors"
    Phys. Rev. Lett. 110, 107204 (2013).

Lab Members

Principal Investigator

Yoshinori Tokura
Team Leader

Core Members

Minoru Kawamura
Senior Research Scientist
Ryutaro Yoshimi
Special Postdoctoral Researcher
Harold Yoonsung Hwang
Senior Visiting Scientist
Ayako Yamamoto
Visiting Scientist
Ken Okada
Junior Research Associate

Contact information

Frontier Research Laboratory, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan

Email: tokura [at] riken.jp

Related links

Recent research results

October 9, 2015: RIKEN RESEARCH
Characterizing electrons in the smallest devices