RIKEN Center for Emergent Matter Science Emergent Phenomena Measurement Research Team

Team Director: Tetsuo Hanaguri (D.Eng.)

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Research Summary

We experimentally study electronic states behind emergent phenomena in electron systems, such as high-temperature superconductivity and topological quantum phenomena. For this purpose, we use scanning tunneling microscopes working under combined extreme conditions of very low temperature, high magnetic field and ultra-high vacuum. Modern scanning-tunneling-microscopy technology enables us to obtain a “map of the electronic state” with atomic-scale spatial resolution and energy resolution as high as micro electron volt. We will make and analyze the maps of various materials and try to establish the relationships between material properties and electronic states. We also aim to improve and functionalize the scanning tunneling microscope and pursue the development of novel measurement techniques to discover new emergent phenomena in condensed matter.

Main Research Fields

Mathematical & Physical Sciences

Related Research Fields

Interdisciplinary Science & Engineering

Keywords

Superconductivity
Topological quantum phenomena
Scanning probe microscopy

Selected Publications

1. Butler, C.J., Ikenobe, T., Jiang, M.-C., Hirai, D., Yamada, T., Guo, G.-Y., Arita, R., Hanaguri, T., and Hiroi, Z.:
"Coexisting Electronic Smectic Liquid Crystal and Superconductivity in a Si Square-Net Semimetal"
Phys. Rev. Lett. 136, 076001 (2026).
2. Hanaguri, T.:
"Modulation of superconducting properties by the charge density wave at the surface of 2H-NbSe2"
Phys. Rev. Res. 8, 013164 (2026).
3. Sakai, S., Yamaji, Y., Imoto, F., Tamegai, T., Kaminski, A., Kondo, T., Kohsaka, Y., Hanaguri, T., and Imada, M.:
"Unified Description of Cuprate Superconductors by Fractionalized Electrons Emerging from Integrated Analyses of Photoemission Spectra and Quasiparticle Interference"
Phys. Rev. X 16, 011018 (2026).
4. Butler, C.J., Naritsuka, M. and Hanaguri, T.:
"Topical review: the nature of the ground state and possibility of a quantum spin liquid in 1T metal dichalcogenides"
J. Phys.: Condens. Matter 37 403002 (2025).
5. Nishimichi, H., Machida, T., Ichinokura, S., Kaku, S., Ishihara, K., Tanaka, K., Hanaguri, T. and Hirahara, T.:
"Momentum-resolved spectroscopic evidence of a metal-insulator transition in Si(111)√3 ×√3-Sn"
Phys. Rev. B 111, 235134 (2025).
6. Naritsuka, M., Machida, T., Asano, S., Yanase, Y. and Hanaguri, T.:
"Superconductivity controlled by twist angle in monolayer NbSe2 on graphene"
Nature Phys. 21, 746-753 (2025).
7. Butler, C.J., Murase, M., Sawada, S., Jiang, M-C., Hashizume, D., Guo G-Y., Arita, R., Hanaguri, T. andSasagawa, T.:
"Valley Polarization of Landau Levels in the ZrSiS Surface Band Driven by Residual Strain"
Phys. Rev. X 15, 011033 (2025).
8. Machida, T. and Hanaguri, T.:
"Searching for Majorana quasiparticles at vortex cores in iron-based superconductors"
Prog. Theor. Exp. Phys. 2024 08C103 (2024).
9. Yasui, Y., Iwata, K., Okazaki, S., Miyasaka, S., Sugimoto, Y., Hanaguri, T., Takagi, H. and Sasagawa, T.:
"Closing of the Mott gap near step edges in NiS2"
Phys. Rev. B 110, 045139 (2024).
10. Butler, C.J., Yoshida, M., Hanaguri, T. and Iwasa, Y.:
"Behavior under magnetic field of resonance at the edge of the upper Hubbard band in 1T-TaS2"
Phys. Rev. B 107, L161107 (2023).