Associate Professor, Faculty of Pure and Applied Sciences, University of Tsukuba
- Research on topological electronic phase and anomalous transport property in correlated Dirac/Weyl electron system
E-mail : fujioka[at]ims.tsukuba.ac.jp
My research field is the spin/orbital degrees of freedom in correlated electron system. Specifically, I have been searching novel spin/orbital ordering phenomena and Dirac/Weyl semimetal in Mott transition materials. By combining the material synthesis and spectroscopic technique including terahertz/infrared optics or X-ray scattering, I am aiming at searching novel quantum phenomena from micro/macroscopic view points.
I am experimentally searching novel topological quantum phenomena by developing new materials including 5d-electron systems.
- B.Sc. in Physics, the University of Tokyo
- M.S. in Physics, the University of Tokyo
- JSPS Fellow (PD)
- Japan Science and Technology Agency Fellow
- Present Lector, Dept. of Applied Phys., the University of Tokyo
- Research Associate, Dept. of Applied Phys., the University of Tokyo
- Researcher, PRESTO Japan Science and Technology Agency
- Associate Professor, Faculty of Pure and Applied Sciences, University of Tsukuba
HONORS AND AWARDS
- Young Scientist Award of the Physical Society of Japan
- Young Teacher Award, University of Tsukuba
SELECTION OF PUBLICATIONS
"Enhanced thermopower in the correlated semimetallic phase of hole-doped pyrochlore iridates"
R. Kaneko, M.-T. Huebsch, S. Sakai, R. Arita, H. Shinaoka, K. Ueda, Y. Tokura, and J. Fujioka,
Physical Review B 99, 161104(R)-1-5 (Apr. 2019).
"Strong-correlation induced high-mobility electrons in Dirac semimetal of perovskite oxide"
J. Fujioka, R. Yamada, M. Kawamura, S. Sakai, M. Hirayama, R. Arita, T. Okawa, D. Hashizume ,M. Hoshino and Y. Tokura,
Nature Communications 10, 362-1-6 (Jan. 2019).
"Spontaneous Hall effect in the Weyl semimetal candidate of all-in all-out pyrochlore iridate"
K. Ueda, R. Kaneko, H. Ishizuka, J. Fujioka, N. Nagaosa and Y. Tokura
Nature Communications 9, 3032 (Aug. 2018).
"Magnetic-field induced multiple topological phases in pyrochlore iridates with Mott criticality"
K. Ueda, T. Oh, B. Yang, R. Kaneko, J. Fujioka, N. Nagaosa, and Y. Tokura,
Nature Communications 8, 15515-1-7 (Mar. 2017).
"Correlated Dirac semimetallic state with unusual positive magnetoresistance in strain-free perovskite SrIrO3"
J. Fujioka, T. Okawa, A. Yamamoto, and Y. Tokura,
Physical Review B 95, 121102(R)-1-5 (Mar. 2017).
"Variation of optical conductivity spectra in the course of bandwidth-controlled metal-insulator transitions in pyrochlore iridates"
K. Ueda, J. Fujioka, Y. Tokura,
Physical Review B, 93, 245120-1-10 (Jun. 2016).
"Strain-sensitive spin-state ordering in thin films of perovskite LaCoO3"
J. Fujioka, Y. Yamasaki, A. Doi, H. Nakao, R. Kumai, Y. Murakami, M. Nakamura, M. Kawasaki, T. Arima, and Y. Tokura,
Physical Review B 92, 195115-1-6 (Nov. 2015).
"Mobile metallic domain walls in an all-in-all-out magnetic insulator"
E. Y. Ma, Y-T Cui, K. Ueda, S. Tang, K. Chen, N. Tamura, P. M. Wu, J. Fujioka, Y. Tokura, Z-X. Shen,
Science 350, 538-1-5 (Oct. 2015).
"Pressure and magnetic field effects on metal-insulator transitions of bulk and domain wall states in pyrochlore iridates"
K. Ueda, J. Fujioka, C. Terakura, Y. Tokura,
Physical Review B, 92, 121110-1-5 (Sep. 2015).
"Ferroelectric-like metallic state in electron doped BaTiO3"
J. Fujioka, A. Doi, D. Okuyama, D. Morikawa, T. Arima, K. N. Okada, Y. Kaneko,T. Fukuda, H. Uchiyama, D. Ishikawa, A. Q. R. Baron, K. Kato, M. Takata and Y. Tokura,
Scientific Reports 5, 13207-1-9 (Aug. 2015).
"Anomalous domain-wall conductance in pyrochlore-type Nd2Ir2O7 on the verge of the metal-insulator transition"
K. Ueda, J. Fujioka, Y. Takahashi, T. Suzuki, S. Ishiwata, Y. Taguchi, M. Kawasaki, and Y. Tokura,
Physical Review B、89, 075127-1-5 (Feb. 2014).
"Spin-Orbital Superstructure in Strained Ferrimagnetic Perovskite Cobalt Oxide"
J. Fujioka, Y. Yamasaki, H. Nakao, R. Kumai, Y. Murakami, M. Nakamura, M. Kawasaki, and Y. Tokura,
Physical Review Letters 111, 027206-1-5 (Jul. 2013).
"Variation of Charge Dynamics in the Course of Metal-Insulator Transition for Pyrochlore-Type Nd2Ir2O7"
K. Ueda, J. Fujioka, Y. Takahashi, T. Suzuki, S. Ishiwata, Y. Taguchi, and Y. Tokura,
Physical Review Letters 109, 136402-1-5 (Sep. 2012).