Centers & Labs

RIKEN Center for Emergent Matter Science

Electronic States Spectroscopy Research Team

Team Leader: Kyoko Ishizaka (Ph.D.)
Kyoko  Ishizaka(Ph.D.)

We investigate the electronic states of materials showing a variety of physical properties, functions, and quantum phenomena. We use spin- and angle-resolved photoemission spectroscopy, which can probe the energy, momentum, and spin of electrons in solids. By using this ultimate spectroscopy probe, we study new materials, topological quantum states, many-body effects in strongly correlated systems, and so on. We further plan developing new experimental methods to probe dynamical states of matter, by using photons and electrons.

Main Research Field

Physics

Related Research Fields

Materials Sciences

Research Subjects

  • Investigation on electronic states of topological materials
  • Investigation on new functional materials
  • Investigation on novel superconductors

Selected Publications

Papers with an asterisk(*) are based on research conducted outside of RIKEN.
  1. *Suzuki, Y., Shimojima, T., Sonobe, T., Nakamura, A., Sakano, M., Tsuji, H., Omachi, J., Yoshioka, K., Kuwata-Gonokami, M., Watashige, T., Kobayashi, R., Kasahara, S., Shibauchi, T., Matsuda, Y., Yamakawa, Y., Kontani, H., and Ishizaka K.:
    "Momentum-dependent sign inversion of orbital order in superconducting FeSe"
    Phys. Rev. B 92, 205117 (2015)
  2. *Sakano, M., Okawa, K., Kanou, M., Sanjo, H., Okuda, T., Sasagawa, T., Ishizaka, K.:
    "Topologically protected surface states in a centrosymmetric superconductor β-PdBi2"
    Nat. Commun. 6, 8595 (2015)
  3. Suzuki, R., Sakano, M., Zhang, Y. J., Akashi, R., Morikawa, D., Harasawa, A., Yaji, K., Kuroda, K., Miyamoto, K., Okuda, T., Ishizaka, K., Arita, R., and Iwasa, Y.:
    "Valley-dependent spin polarization in bulk MoS2 with broken inversion symmetry"
    Nat. Nanotech. 9, 611 (2014)
  4. 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)
  5. Ishizaka, K., Bahramy, M. S., Murakawa, H., Sakano, M., Shimojima, T., Sonobe, T., Koizumi, K., Shin, S., Miyahara, H., Kimura, A., Miyamoto, K., Okuda, T., Namatame, H., Taniguchi, M., Arita, R., Nagaosa, N., Kobayashi, K., Murakami, Y., Kumai, R., Kaneko, Y., Onose, Y., and Tokura, Y.:
    "Giant Rashba-type spin splitting in bulk BiTeI"
    Nat. Mater. 10, 521 (2011)

Contact information

2-1 Hirosawa,
Wako, Saitama
351-0198, Japan

Email: kyoko.ishizaka [at] riken.jp