Centers & Labs

RIKEN Center for Emergent Matter Science

Strong Correlation Interface Research Group

Group Director: Masashi Kawasaki (D.Eng.)
Masashi  Kawasaki(D.Eng.)

Being distinct from conventional semiconductors where single electron picture can explain their properties and device functionalities, correlated quantum materials exhibit exotic properties governed by electron-electron interaction. When dissimilar electronic states are faced at atomically controlled interfaces, their keen competition is expected to give gigantic responses to external stimuli. Also emerging field is to explore novel quantum transport in two-dimensional systems created at the interfaces of such materials. We aim at designing and controlling the interfacial properties to realize surpassing device performances in switches, sensors and photovoltaics to those of semiconductors.

Main Research Field

Interdisciplinary science and engineering

Related Research Fields

Mathematical and physical sciences


  • Oxide Electronics
  • Topological Electronics
  • Interface Engineering
  • Quantum Transport
  • Interfaces and Superlattcies

Selected Publications

  1. K. S. Takahashi, Y. Matsubara, M. S. Bahramy, N. Ogawa, D. Hashizume, Y, Tokura, and M. Kawasaki
    "Polar metal phase stabilized in strained La-doped BaTiO3 films"
    Scientific Reports, 7, 4631 (2017).
  2. M. Nakamura, S. Horiuchi, F. Kagawa, N. Ogawa, T. Kurumaji, Y. Tokura, and M. Kawasaki
    "Shift current photovoltaic effect in a ferroelectric charge-transfer complex"
    Nature Communications, 8, 281 (2017).
  3. D. Maryenko, A. S. Mishchenko, M. S. Bahramy, A. Ernst, J. Falson, Y. Kozuka, A. Tsukazaki, N. Nagaosa, and M. Kawasaki
    "Observation of anomalous Hall effect in a non-magnetic two-dimensional electron system"
    Nature Communications 8, 14777 (2017).
  4. J. Matsuno, N. Ogawa, K. Yasuda, F. Kagawa, W. Koshibae, N. Nagaosa, Y. Tokura, and M. Kawasaki "Interface-driven topological Hall effect in SrRuO3-SrIrO3 bilayer"
    Science Advances 2, e1600304 (2016).
  5. Y. Matsubara, K. S. Takahashi, M. S. Bahramy, Y. Kozuka, D. Maryenko, J. Falson, A. Tsukazaki, Y. Tokura, and M. Kawasaki
    "Observation of the quantum Hall effect in δ-doped SrTiO3"
    Nature Communications 7, 11631 (2016).
  6. M. Nakamura, F. Kagawa, T. Tanigaki, H. S. Park, T. Matsuda, D. Shindo, Y. Tokura, and M. Kawasaki
    "Spontaneous polarization and bulk photovoltaic effect driven by polar discontinuity in LaFeO3/SrTiO3 heterojunctions"
    Physical Review Letters 116, 156801 (2016).
  7. T. C. Fujita, M. Uchida, Y. Kozuka, W. Sano, A. Tsukazaki, T. Arima, and M. Kawasaki
    "All-in-all-out magnetic domain wall conduction in a pyrochlore iridate heterointerface"
    Physical Review B 93, 064419 (2016).
  8. D. Maryenko, J. Falson, M. S. Bahramy, I. A. Dmitriev, Y. Kozuka, A. Tsukazaki, and M. Kawasaki
    "Spin-selective electron quantum transport in nonmagnetic MgZnO/ZnO heterostructures"
    Physical Review Letters 197601 (2015).
  9. J. Falson, D. Maryenko, B. Friess, D. Zhang, Y. Kozuka, A. Tsukazaki, J. Smet, and M. Kawasaki
    "Even-denominator fractional quantum Hall physics in ZnO"
    Nature Physics 11, 347 (2015).
  10. Z. Sheng, M. Nakamura, W. Koshibae, T. Makino, Y. Tokura, and M. Kawasaki
    "Magneto-tunable photocurrent in manganite based heterojunctions"
    Nature Communications 5, 4584 (2014).

Lab Members

Principal Investigator

Masashi Kawasaki
Group Director

Core Members

Kei Takahashi
Senior Scientist
Masao Nakamura
Senior Scientist
Denis Maryenko
Research Scientist
Jobu Matsuno
Visiting Scientist