### Name

Kenji YASUDA (K. Yasuda)

### Biography

Mar. 2010 | graduated from High School at Komaba, University of Tsukuba (Tokyo) |

Mar. 2014 | B.S., Dept. of Physics, Faculty of Science, University of Tokyo |

Mar. 2016 | M.S., Graduate School of Engineering, University of Tokyo |

Apr. 2016-present | Ph.D. course student, Dept. of Applied Physics, Graduate School of Engineering, University of Tokyo |

JSPS Research Fellow (DC1) |

### Original Papers

- "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

arXiv - "Current-nonlinear Hall effect and spin-orbit torque magnetization switching in a magnetic topological insulator"

__K. Yasuda__, A. Tsukazaki, R. Yoshimi, K. Kondou, K. S. Takahashi, Y. Otani, M. Kawasaki and Y. Tokura

arXiv - "Large Unidirectional Magnetoresistance in a Magnetic Topological Insulator"
__K. Yasuda__, A. Tsukazaki, R. Yoshimi, K. S. Takahashi, M. Kawasaki and Y. Tokura

Phys. Rev. Lett.**117**, 127202 (2016).(arXiv) - "Zero-bias photocurrent in ferromagnetic topological insulator"

N. Ogawa, R. Yoshimi,__K. Yasuda__, A. Tsukazaki, M. Kawasaki and Y. Tokura

Nat. Commun.**7**, 12246 (2016). - "Interface-driven topological Hall effect in SrRuO
_{3}-SrIrO_{3}bilayer"

J. Matsuno, N. Ogawa,__K. Yasuda__, F. Kagawa, W. Koshibae, N. Nagaosa, Y. Tokura and M. Kawasaki

Sci. Adv.**2**, e1600304 (2016). (arXiv) - "Geometric Hall effects in topological insulator heterostructures"
__K. Yasuda__, R. Wakatsuki, T. Morimoto, R. Yoshimi, A. Tsukazaki, K. S. Takahashi, M. Ezawa, M. Kawasaki, N. Nagaosa and Y. Tokura

Nat. Phys.**12**, 555 (2016). - "Brillouin-Wigner theory for high-frequency expansion in periodically driven systems: Application to Floquet topological insulators"

T. Mikami, S. Kitamura,__K. Yasuda__, N. Tsuji, T. Oka and H. Aoki

Phys. Rev. B**93**, 144307 (2016). (arXiv) - "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

Appl. Phys. Lett.**107**, 182401 (2015). (arXiv) - "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

Nat. Commun.**6**, 8530 (2015). (* equal contribution) (arXiv)

### Invited Talks

- "Current-nonlinear magnetotransport and spin-orbit torque magnetization switching in a magnetic topological insulator"

SPIE Conference : Spintronics, X Session 5, 10357-27, San-Diego, USA (August 2017)__K. Yasuda__, A. Tsukazaki, R. Yoshimi, K, Kondou, K. S. Takahashi, Y. Otani, M. Kawasaki and Y. Tokura

### Presentations in International Conferences

- "Quantized chiral edge conduction on reconfigurable domain walls of a magnetic topological insulator"

Gordon Research Conference Topological & Correlated Matter, P21-15, Tokyo, Japan (June 2017)__K. Yasuda__, M. Mogi, R. Yoshimi, A. Tsukazaki, K. S. Takahashi, M. Kawasaki, F. Kagawa and Y. Tokura - "Observation and control of the quantized conduction on the domain wall of a magnetic topological insulator"

International Conference on Topological Materials Science 2017 (Topomat2017), 12AM-2, Tokyo, Japan (May 2017)__K. Yasuda__, M. Mogi, R. Yoshimi, A. Tsukazaki, K. S. Takahashi, M. Kawasaki, F. Kagawa and Y. Tokura - "Large Unidirectional magnetoresistance in a Magnetic Topological Insulator"

APS March Meeting 2017, R3.00001, New Orleans, Louisiana, USA (March 2017)__K. Yasuda__, A. Tsukazaki, R. Yoshimi, K. S. Takahashi, M. Kawasaki and Y. Tokura - "Spin-orbit torque magnetization switching and current-nonlinear
Hall effect in a magnetic topological insulator"

Topological Phases and Functionality of Correlated Electron Systems (TPFC2017), P18, Kashiwa, Japan (February 2017)__K. Yasuda__, A. Tsukazaki, R. Yoshimi, K, Kondou, K. S. Takahashi, Y. Otani, M. Kawasaki and Y. Tokura - "Large Unidirectional magnetoresistance in a Magnetic Topological Insulator"

CEMS-QPEC Symposium on Emergent Quantum Materials, P47, Tokyo, Japan (January 2017)__K. Yasuda__, A. Tsukazaki, R. Yoshimi, K. S. Takahashi, M. Kawasaki and Y. Tokura - "Large Unidirectional magnetoresistance in Magnetic Topological Insulator"

International workshop on nano-spin conversion science & quantum spin dynamics (NSCS-QSD), P5, Tokyo, Japan (October 2016)__K. Yasuda__, A. Tsukazaki, R. Yoshimi, K. S. Takahashi, M. Kawasaki and Y. Tokura

Selected as Poster Award - "Large Unidirectional magnetoresistance in Magnetic Topological Insulator"

CIQM Frontiers in Quantum Materials and Devices Workshop (FQMD2016), P41, Wako, Japan (June 2016)__K. Yasuda__, A. Tsukazaki, R. Yoshimi, K. S. Takahashi, M. Kawasaki and Y. Tokura - "Quantum Transport in magnetic/nonmagnetic topological insulator bilayer"

Workshop on“Topological magnets”, P20, Tokyo, Japan (May 2015)__K. Yasuda__, R. Yoshimi, A. Tsukazaki, K. S. Takahash, N. Nagaosa, M. Kawasaki and Y. Tokura

Other talks in Japan are listed in the Japanese page.

### Theses

- "Photoinduced topological phase transitions on Honeycomb lattice"

Bachelor Thesis (FY2013, Dept. of Physics, University of Tokyo) - "Magnetic structure and Magnetotransport phenomena in topological insulator heterostructures"

Bachelor Thesis (FY2015, Dept. of Physics, University of Tokyo)

### Awards

- 2015, Shoji Tanaka prize (master's thesis prize)
- 2015 Best master's thesis Award
- International workshop on nano-spin conversion science & quantum spin dynamics (NSCS-QSD) Poster Award
- TMS2016 Poster preview award