RIKEN Center for Emergent Matter Science Strong Correlation Interface Research Group

Group Director: Masashi Kawasaki (D.Eng.)

Japanese Page

Research Summary

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 Fields

Interdisciplinary Science & Engineering

Related Research Fields

Mathematical & Physical Sciences

Keywords

Oxide Electronics
Topological Electronics
Interface Engineering
Quantum Transport
Interfaces and Superlattcies

Selected Publications

1. S. Inagaki, M. Nakamura, Y. Okamura, M. Ogino, Y. Takahashi, L. C. Peng, X. Z. Yu, Y. Tokura, and M. Kawasaki.:
"Heteroepitaxial growth of wide bandgap cuprous iodide films exhibiting clear free-exciton emission"
Appl. Phys. Lett., 118, 012103 (2021).
2. M. Uchida, T. Nomoto, M. Musashi, R. Arita, and M. Kawasaki.:
"Superconductivity in uniquely strained RuO₂ films"
Phys. Rev. Lett., 125, 147001 (2020).
3. H. Hatada, M. Nakamura, M. Sotome, Y. Kaneko, N. Ogawa, T. Morimoto, Y. Tokura, and M. Kawasaki.:
"Defect tolerant zero-bias topological photocurrent in a ferroelectric semiconductor"
PNAS., 117, 20411 (2020).
4. K. Maruhashi, K. S. Takahashi, M. S. Bahramy, S. Shimizu, R. Kurihara, A. Miyake, M. Tokunaga, Y. Tokura, and M. Kawasaki.:
"Anisotropic quantum transport through a single spin channel in the magnetic semiconductor EuTiO₃"
Adv. Mater., 32, 1908315 (2020).
5. M. Nakamura, H. Hatada, N. Ogawa, M. Sotome, Y. Tokura and M. Kawasaki.:
"Non-local photocurrent in a ferroelectric semiconductor SbSI under local photoexcitation"
Appl. Phys. Lett., 116, 122902 (2020).
6. S. Inagaki, M. Nakamura, H. Hatada, R. Nishino, F. Kagawa, Y. Tokura and M. Kawasaki.:
"Growth of visible-light-responsive ferroelectric SbSI thin films by molecular beam epitaxy"
Appl. Phys. Lett., 116, 072902 (2020).
7. K. Tanaka, J. Falson, Y. Kozuka, M. Uchida, D. Maryenko, J. T. Ye, Y. Iwasa, A. Tsukazaki, J. H. Smet, and M. Kawasaki.:
"Ballistic transport in periodically modulated MgZnO/ZnO two-dimensional electron systems"
Appl. Phys. Lett., 115, 153101 (2019).
8. S. Nishihaya, M. Uchida, Y. Nakazawa, R. Kurihara, K. Akiba. M. Kriener, A. Miyake, Y. Taguchi, M. Tokunaga, and M. Kawasaki.:
"Quantized surface transport in topological Dirac semimetal films"
Nat. Commun., 10, 2564 (2019).
9. K. S. Takahashi, H. Ishizuka, T. Murata, Q. Y. Wang, Y. Tokura, N. Nagaosa, and M. Kawasaki.:
"Anomalous Hall effect derived from multiple Weyl nodes in high-mobility EuTiO₃ films"
Sci. Adv., 4, eaar7880 (2018).
10. D. Maryenko, A. McCollam, J. Falson, Y. Kozuka, J. Bruin, U. Zeitler, and M. Kawasaki.:
"Composite fermion liquid to Wigner solid transition in the lowest Landau level of zinc oxide"
Nat. Commun., 9, 4356 (2018).