RESEARCH

I have been working on the fabrication of topological insulator thin films and their multilayer structures and the elucidation of quantum transport phenomena such as the quantum Hall effect and the quantum anomalous Hall effect caused by breaking time-reversal symmetry.

I intend to promote research in the future so that I can contribute to the development of topological physical properties in terms of material development.

EDUCATION

2016

Ph.D. in Physics, the University of Tokyo

PROFESSIONAL EXPERIENCE

2016-present

Researcher, RIKEN Center for Emergent Matter Science

HONORS AND AWARDS

2017

16th Funai Research Encouragement Award

2017

33rd Inoue Research Encouragement Award

SELECTION OF PUBLICATIONS

"Current-driven magnetization switching in ferromagnetic bulk Rashba semiconductor (Ge,Mn)Te"
R. Yoshimi, K. Yasuda, A. Tsukazaki, K. S. Takahashi, M. Kawasaki, and Y. Tokura
Science Advances 4, eaat9989-1-7 (Dec. 2018).
DOI: 10.1126/sciadv.aat9989

"Quantized chiral edge conduction on reconfigurable domain walls of a magnetic topological insulator"
K. Yasuda, M. Mogi, R. Yoshimi, A. Tsukazaki, K. S. Takahashi, M. Kawasaki, F. Kagawa and Y. Tokura.
Science 358, 1311-1314 (Dec. 2017).
DOI: 10.1126/science.aan5991

"Fermi level dependent charge-to-spin current conversion by Dirac surface state of topological insulators"
K. Kondou, R. Yoshimi, A. Tsukazaki, Y. Fukuma, J. Matsuno, K. S. Takahashi, M. Kawasaki, Y. Tokura and Y. Otani,
Nature Physics 12, 1027-1031 (Jul. 2016).
DOI: 10.1038/NPHYS3833

"Zero-bias photocurrent in ferromagnetic topological insulator"
N. Ogawa, R. Yoshimi, K. Yasuda, A. Tsukazaki, M. Kawasaki, and Y. Tokura,
Nature Communications 7, 12246-1-6 (Jul. 2016).
DOI: 10.1038/ncomms12246

"Magnetic modulation doping in topological insulators toward higher-temperature quantum anomalous Hall effect"
M. Mogi, R. Yoshimi, A. Tsukazaki, K. Yasuda, Y. Kozuka, K. S. Takahashi, M. Kawasaki and Y. Tokura,
Applied Physics Letters 107, 182401-1-5 (Nov. 2015).
https://doi.org/10.1063/1.4935075

"Quantum Hall states stabilized in semi-magnetic bilayers of topological insulators"
R. Yoshimi, K. Yasuda, A. Tsukazaki, K. S. Takahashi, N. Nagaosa, M. Kawasaki and Y. Tokura
Nature Communications 6, 8530-1-6 (Oct.2015).
DOI: 10.1038/ncomms9530

"Quantum Hall effect on top and bottom surface states of topological insulator (Bi_1-xSb_x)₂Te₃ films"
R. Yoshimi, A. Tsukazaki, Y. Kozuka, J. Falson, K. S. Takahashi, J. G. Checkelsky, N. Nagaosa, M. Kawasaki and Y. Tokura
Nature Communications 6, 6627-1-6 (Apr. 2015).
DOI: 10.1038/ncomms7627

"Trajectory of the anomalous Hall effect towards the quantized state in a ferromagnetic topological insulator"
J. G. Checkelsky, R. Yoshimi, A. Tsukazaki, K. S. Takahashi, Y. Kozuka, J. Falson, M. Kawasaki and Y. Tokura,
Nature Physics 10, 731-736 (Aug. 2014).
DOI: 10.1038/NPHYS3053

"Dirac electron states formed at the heterointerface between a topological insulator and a conventional semiconductor"
R. Yoshimi, A. Tsukazaki, K. Kikutake, J. G. Checkelsky, K. S. Takahashi, M. Kawasaki and Y. Tokura
Nature Materials 13, 253-257 (Feb. 2014).
DOI: 10.1038/NMAT3885

"Dirac electron states formed at the heterointerface between a topological insulator and a conventional semiconductor"
R. Yoshimi, A. Tsukazaki, K. Kikutake, J. G. Checkelsky, K. S. Takahashi, M. Kawasaki and Y. Tokura,
Nature Materials 13, 253-257 (Feb. 2014).
DOI: 10.1038/NMAT3885