RIKEN Center for Emergent Matter Science Topological Phenomena Theory Research Team

Team Director: Shuichi Murakami (Ph.D,)

Japanese Page

Research Summary

Our team conducts theoretical research on emergent physical phenomena of electrons and quasiparticles in materials and waves in metamaterials, focusing on their topological structures. Our research methods are mainly analytical methods using models, and we find universal laws and phenomena from a broad perspective of quantum to classical systems. Our research activities cover a wide range of topics, from research on specific materials to the construction of theoretical frameworks for condensed matter and mathematical physics. Specifically, we are working in the fields such as topological phases, chiral phonons, electro-magnetic multipoles, non-Hermitian systems, and metamaterials.

Main Research Fields

Mathematical & Physical Sciences

Related Research Fields

Semiconductors, optical properties of condensed matter and atomic physics-related
Magnetism, superconductivity and strongly correlated systems-related

Keywords

Topological insulator
Spintronics
Topological semimetal

Selected Publications

Papers with an asterisk(*) are based on research conducted outside of RIKEN.

1. *Murakami, S.:
"Quantum Spin Hall Effect and Enhanced Magnetic Response by Spin-Orbit Coupling"
Phys. Rev. Lett. 97, 236805 (2006).
2. *Murakami, S.:
"Phase transition between the quantum spin Hall and insulator phases in 3D: emergence of a topological gapless phase"
New J. Phys.9, 356 (2007).
3. *Matsumoto R., Murakami, S.:
"Theoretical prediction of rotating magnon wavepacket in ferromagnets"
Phys. Rev. Lett.106, 197202 (2011).
4. *Hirayama, M., Okugawa, R., Miyake, T., Murakami, S.:
"Topological Dirac nodal lines and surface charges in fcc alkaline earth metals"
Nature Communications 8, 14022 (2017).
5. *Hamada, M., Minamitani, E., Hirayama, M., and Murakami, S.:
"Phonon Angular Momentum Induced by the Temperature Gradient"
Phys. Rev. Lett. 121, 175301 (2018).
6. *Yokomizo, K. and Murakami, S.:
"Non-Bloch Band Theory of Non-Hermitian Systems"
Phys. Rev. Lett.123, 066404 (2019).
7. *Tanaka, Y., Zhang, T., Uwaha, M., Murakami, S.:
"Anomalous Crystal Shapes of Topological Crystalline Insulators"
Phys. Rev. Lett. 129, 046802 (2022).
8. *Yoshida, H., Zhang, T., Murakami, S.:
"Polarization jumps by breaking symmetries of two-dimensional Weyl semimetals"
Phys. Rev. B 107, 035122 (2022).
9. *Wada, H., Naito, K., Ono, S., Shiozaki, K., Murakami, S.:
"General corner charge formulas in various tetrahedral and cubic space groups"
Phys. Rev. B 109, 085114 (2024).
10. *Zhang, T., Murakami, S., Miao, H.:
"Weyl phonons: the connection of topology and chirality"
Nat. Commun. 16, 3560 (2025).

Lab Members

Principal investigator

Shuichi Murakami: Team Director

Contact Information

Main Research Building
2-1 Hirosawa, Wako, Saitama 351-0198, Japan
Email: shuichi.murakami@riken.jp