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RIKEN Center for Emergent Matter Science Extreme Quantum Matter Physics RIKEN ECL Research Unit

RIKEN ECL Unit Leader: Yukako Fujishiro (Ph.D.)

Research Summary

Kosuke Karube

In our unit, we aim to investigate intriguing emergent phenomena in magnetic topological materials and strongly correlated electron system, with a particular emphasis on “extreme” conditions previously unattainable in earlier experiments. For instance, we employ microfabrication techniques on single crystalline quantum materials using focused ion beams. This enables us to (i) explore responses under ultra-high pressure, (ii) generate magnetization dynamics in spin textures through high-density currents, and (iii) manipulate carrier densities through ion intercalation. Through these innovative approaches, we aim to reveal new quantum phases and elucidate their electronic functionalities.

Main Research Fields

  • Mathematical & Physical Sciences

Related Research Fields

  • Engineering
  • Chemistry
  • Interdisciplinary Science & Engineering
  • Magnetism, superconductivity and strongly correlated systems-related
  • Applied physical properties-related
  • Inorganic materials and properties-related

Keywords

  • Magnetic topological material
  • Strongly correlated electron system
  • Charge transport phenomena
  • Intercalation
  • Ultra-high pressure

Selected Publications

  • 1. Y. Fujishiro, C. Terakura, A. Miyake, N. Kanazawa, K. Nakazawa, N. Ogawa, H. Kadobayashi, S. Kawaguchi, T. Kagayama, M. Tokunaga, Y. Kato, Y. Motome, K. Shimizu, and Y. Tokura.:
    "Pressure-induced quantum melting of chiral spin order and subsequent transition to a degenerate semiconductor state in FeGe"
    Physical Review B 110, L220401 (2024)
  • 2. D. Singh, Y. Fujishiro, S. Hayami, S. Mooday, T. Nomoto, P. R. Baral, V. Ukleev, R. Cubitt, N-J. Steinke, D. J. Gawryluk, E. Pomjakushina, Y. Onuki, R. Arita, Y. Tokura, N. Kanazawa, and J. S. White.:
    "Transition between distinct hybrid skyrmion textures through their hexagonal-to-square crystal transformation in a polar magnet"
    Nature Communications 14, 8050 (2023)
  • 3. Y. Fujishiro, N. Kanazawa, R. Kurihara, H. Ishizuka, T. Hori, F. S. Yasin, X.Z. Yu, A. Tsukazaki, M. Ichikawa, M. Kawasaki, N. Nagaosa, M. Tokunaga, and Y. Tokura.:
    "Giant anomalous Hall effect from spin-chirality scattering in a chiral magnet"
    Nature Communications 12, 317 (2021)
  • 4. M. Tanaka, Y. Fujishiro, M. Mogi, Y. Kaneko, T. Yokosawa, N. Kanazawa, S. Minami, T. Koretsune, R. Arita, S. Tarucha, M. Yamamoto, and Y. Tokura.:
    "Topological Kagome Magnet Co3Sn2S2 Thin Flakes with High Electron Mobility and Large Anomalous Hall Effect"
    Nano Letters 20, 7476 (2020)
  • 5. Y. Fujishiro, N. Kanazawa, and Y. Tokura.:
    "Engineering skyrmions and emergent monopoles in topological spin crystals"
    Applied Physics Letters 116, 090501 (2020)
  • 6. Y. Fujishiro, N. Kanazawa, T. Nakajima, X. Z. Yu, K. Ohishi, Y. Kawamura, K. Kakurai, T. Arima, H. Mitamura, A. Miyake, K. Akiba, M. Tokunaga, A. Matsuo, K. Kindo, T. Koretsune, R. Arita, and Y. Tokura.:
    "Topological transitions among skyrmion- and hedgehog-lattice states in cubic chiral magnets"
    Nature Communications 10, 1059 (2019)
  • 7. Y. Fujishiro, N. Kanazawa, T. Shimojima, A. Nakamura, K. Ishizaka, T. Koretsune, R. Arita, A. Miyake, H. Mitamura, K. Akiba, M. Tokunaga, J. Shiogai, S. Kimura, S. Awaji, A. Tsukazaki, A. Kikkawa, Y. Taguchi, and Y. Tokura.:
    "Large magneto-thermopower in MnGe with topological spin texture"
    Nature Communications 9, 408 (2018)

Related Links

Lab Members

Principal investigator

Yukako Fujishiro
RIKEN ECL Unit Leader

Core members

Yuri Suzuki
Student Trainee

Contact Information

Frontier Research Laboratory
2-1 Hirosawa, Wako, Saitama 351-0198, Japan
Email: yukako.fujishiro@riken.jp

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