Centers & Labs

RIKEN Center for Emergent Matter Science

Emergent Device Research Team

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

The purpose of the Emergent Device Team is to make revolutionary contribution to the low energy consumption electronics through creating novel quantum properties and functions based on devices made by heterointerfaces between inorganic and organic materials. The former includes semiconductors, metals, oxides, and chalcogenides, while the latter includes ionic liquids, self-assembled monolayers, and conjugated polymers. In particular, we focus on filed effect phase control such as electric field induced superconductivity, Mott transistor, electric field manipulation of spin current, and novel thermoelectric materials.

Main Research Field

Physics

Related Research Fields

Engineering / Materials Sciences

Research Subjects

  • Field Effect Phase Control and its Applications
  • Fabrication and Properties of Organic-Inorganic Interfaces
  • Topological quantum transport

Selected Publications

  1. 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).
  2. 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).
  3. Saito, Y., Kasahara, Y., Ye, J. T., Iwasa, Y., and Nojima, T.:
    “Metallic ground state in an ion-gated two-dimensional superconductor”
    Science 350, 409 (2015).
  4. 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).
  5. Nii., Y., Kikkawa, A., Yamasaki, Taguchi, Y., Tokura, Y., and Iwasa, Y.:
    “Elastic Stiffness of a Skyrmion Crystal”
    Phys. Rev. Lett. 113, 267203 (2014).
  6. Shimizu, S., Takahashi, K. S., Kubota, M., Kawasaki, M., Tokura, Y., and Iwasa, Y.:
    “Gate tuning of anomalous Hall effect in ferromagnetic metal SrRuO3 Gate tuning of anomalous Hall effect in ferromagnetic metal SrRuO3
    Appl. Phys. Lett. 105, 163509 (2014).
  7. 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).
  8. Hatano, T., Sheng, Z., Nakamura, M., Nakano, M., Kawasaki, M., Iwasa, Y., and Tokura, Y.:
    "Gate Control of Percolative Conduction in Strongly Correlated Manganite Films"
    Adv. Mater. 26, 2874 (2014).
  9. Shimizu, S., Takahashi, K. S., Hatano, T., Kawasaki, M., Tokura, Y., and Iwasa, Y.:
    "Electrically Tunable Anomalous Hall Effect in Pt Thin Films"
    Phys. Rev. Lett. 111, 216803 (2013).
  10. Nakano, M., Shibuya, K., Okuyama, D., Hatano, T., Ono, S., Kawasaki, M., Iwasa, Y., and Tokura, Y.:
    "Collective bulk carrier delocalization driven by electrostatic surface charge accumulation."
    Nature 487, 459 (2012).

Lab Members

Principal Investigator

Yoshihiro Iwasa
Team Leader

Core Members

Sunao Shimizu
Research Scientist
Satria Bisri
Research Scientist

Contact information

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

Email: iwasay [at] riken.jp

Related links

Recent research results

October 13, 2015: Press Release
Just a touch of skyrmions