Centers & Labs

RIKEN Center for Emergent Matter Science

Emergent Device Research Team

Team Leader: Yoshihiro Iwasa (D.Eng.)
Yoshihiro  Iwasa(D.Eng.)

Emergent Device Team is proposing an interdisciplinary concept “Iontronics”, which stands for ion controlled electronics. The purpose of the Emergent Device Team is to make revolutionary contribution to the creation novel properties and function of quantum matter such as strongly correlated materials and nanostructured materias. The central device is the electric double layer transistor (EDLT) using organic electrolyte or ionic liquids/gels, which enables us to produce ultrahigh electric fields or in-situ physical property measurements of the electrochemical processes, which are difficult or impossible to realize in conventional field effect transistors. With EDLT, we explore novel quantum phenomena such as electric field induced superconductivity, Mott transistor, electric field manipulation of spin current. Also, through iontronics, we aim at creating new thermoelectric materials with revolutionarily high energy conversion efficiency.

Main Research Field

Mathematical and physical sciences

Related Research Fields

Interdisciplinary science and engineering / Chemistry / Engineering


  • Electric double layer transistor
  • Two dimensional materials
  • Collodal quantum dots
  • Thermoelectric materials
  • Superconductivity

Selected Publications

  1. Bisri, S. Z., Shimizu, S., Nakano, M., and Iwasa, Y.:
    "Endeavor of iontronics: from fundamentals to applications of ion-controlled electronics"
    Adv. Mater. 29, 1607054 (2017).
  2. Ideue, T., Hamamoto, K., Koshikawa, S., Ezawa, M., Shimizu, S., Kaneko, Y., Tokura, Y., Nagaosa, N., Iwasa, Y.:
    "Bulk rectification effect in a polar semiconductor"
    Nat. Phys. 13, 578 (2017).
  3. Qin, F., Shi, W., Ideue, T., Yoshida, M., Zak, A., Tenne, R., Kikitsu, T., Inoue, D., Hashizume, D., and Iwasa, Y.:
    "Superconductivity in a chiral nanotube"
    Nat. Commun. 8, 14465 (2017).
  4. Wakatsuki, R., Saito, Y., Hoshino, S., Itahashi, Y. M., Ideue, T., Ezawa, M., Iwasa, Y., and Nagaosa, N.:
    "Nonreciprocal charge transport in noncentrosymmetric superconductors"
    Sci. Adv. 3, e1602390 (2017).
  5. Yoshida, M., Iizuka, T., Suzuki, R., Zhang, Y., Iwasa, Y., and Shimizu, S.:
    "Gate-optimized thermoelectric power factor in ultrathin WSe2 single crystals"
    Nano Lett. 16, 2016 (2016).
  6. Saito, Y., Nakamura, Y., Bahramy, M. S., Kohama, Y., Ye, J. T., Kasahara, Y., Nakagawa, Y., Onga, M., Tokunaga, M., Nojima, T., Yanase, Y., and Iwasa, Y.:
    "Superconductivity protected by spin–valley locking in ion-gated MoS2"
    Nat. Phys. 12, 144 (2016).
  7. Shimizu, S., Bahramy, M. S., Iizuka, T., Ono, S.,, Miwa, K., Tokura, Y., and Iwasa, Y.:
    "Enhanced thermopower in ZnO two-dimensional electron gas"
    PNAS 113, 6438 (2016).
  8. Shimizu, S., Ono, S., Hatano, T., Iwasa, T., and Tokura, Y.:
    "Enhanced cryogenic thermopower in SrTiO3 by ionic gating"
    Phys. Rev. B 92, 165304 (2015).
  9. Nii., Y., Nakajima, T., Kikkawa, A., Yamasaki, Y., Ohishi, K. Suzuki, J. Taguchi, Y., Arima, T., Tokura, Y., and Iwasa, Y.:
    "Uniaxial stress control of skyrmion phase"
    Nat. Commun. 6, 8539 (2015).
  10. Suzuki, R., Sakano, M. Zhang, Y. J., Akashi, R., Morikawa, D., Harasawa, A., Yaji, K., Kuroda, K., Miyamoto, K., Okuda, T., Ishizaka, K., and Iwasa, Y.:
    "Valley-dependent spin polarization in bulk MoS2 with broken inversion symmetry"
    Nat. Nanotech. 9, 611 (2014).

Lab Members

Principal Investigator

Yoshihiro Iwasa
Team Leader

Core Members

Sunao Shimizu
Research Scientist
Satria Bisri
Research Scientist
Masaro Yoshida
Postdoctoral Researcher
Ricky Dwi Septianto
International Program Associate

Contact information

2-1 Hirosawa, Wako, Saitama 351-0198, Japan
Tel: +81-(0)48-467-8083

Email: iwasay [at]

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