RIKEN Center for Emergent Matter Science Quantum Matter Theory Research Group

Group Director: Akira Furusaki (D.Sc.)

Japanese Page

Research Summary

Quantum Matter Theory Research Group theoretically studies emergent quantum phenomena of strongly correlated electrons in transition metal oxides, molecular conductors, frustrated quantum magnets, and topological insulators and superconductors, etc. We construct effective models for interacting electrons in materials of interest and study their physical properties such as magnetism and transport using both analytical and numerical methods.

Main Research Fields

Mathematical & Physical Sciences

Related Research Fields

Interdisciplinary Science & Engineering

Keywords

Theoretical condensed matter physics
Quantum transport phenomena
Magnetism
Superconductivity

Selected Publications

1. Kobayashi, S., Sumita, S., Hirayama, M., Furusaki, A.:
"Crystal symmetry protected gapless vortex line phases in superconducting Dirac semimetals"
Phys. Rev. B 107, 214518 (2023).
2. Yoshimi, K., Misawa, T., Tsumuraya, T., Seo, H.:
"Comprehensive ab initio investigation of the phase diagram of quasi-one-dimensional molecular solids"
Phys. Rev. Lett. 131, 036401 (2023).
3. Naka, M., Motome, Y., Seo, H.:
"Anomalous Hall effect in antiferromagnetic perovskites"
Phys. Rev. B 106, 195149 (2022).
4. Yao, Y., Oshikawa, M., Furusaki, A.:
"Gappability index for quantum many-body systems"
Phys. Rev. Lett. 129, 017204 (2022).
5. Kimura, S., Imajo, S., Gen, M., Momoi, T., Hagiwara, M., Ueda, H., Kohama, Y.:
"Quantum phase of the chromium spinel oxide HgCr₂O₄ in high magnetic fields"
Phys. Rev. B 105, L180405 (2022).
6. Kobayashi, S., Furusaki, A.:
"Fragile topological insulators protected by rotation symmetry without spin-orbit coupling"
Phys. Rev. B 104, 195114 (2021).
7. Seo, H., Naka, M.:
"Antiferromagnetic state in kappa-type molecular conductors: spin splitting and Mott gap"
J. Phys. Soc. Jpn. 90, 064713 (2021).
8. Kobayashi, S., Furusaki, A.:
"Double Majorana vortex zero modes in superconducting topological crystalline insulators with surface rotation anomaly"
Phys. Rev. B 102, 180505 (2020).
9. Ueda, H., Onoda, S.:
"Roles of easy-plane and easy-axis XXZ anisotropy and bond alternation on a frustrated ferromagnetic spin-1/2 chain"
Phys. Rev. B 101, 224439 (2020).
10. Furukawa S., Momoi, T.:
"Effects of Dzyaloshinskii-Moriya interactions in volborthite: Magnetic orders and thermal Hall effect"
J. Phys. Soc. Jpn. 89, 034711 (2020).