RESEARCH

The main research interest of my group is correlation effects on topological quantum phenomena. While topological insulators in free fermion systems have been extensively studied, correlation effects on these systems are one of the important issues in topological materials science. For example, several d- or f-electron systems have been proposed as candidate materials of correlated topological insulators, where the interplay of topological structure and electron correlation is expected to trigger novel exotic quantum phenomena. In spite of extensive studies, understanding of topological phases in correlated systems, especially a topological Mott insulator, is still not sufficient.

We will theoretically elucidate fundamental properties of the topological quantum phases and the associated exotic quasiparticles with particular emphasis on correlation effects, which play key roles in unveiling a new aspect of topological materials. We also investigate novel topological phases realized in nonequilibrium quantum systems, such as periodically driven quantum systems which can be described by Floquet theory. Through these systematic studies, we aim at establishing the basic concepts of topological quantum phenomena.

EDUCATION

1980

B.E. Applied Physic, Osaka University

1986

Ph.D. (Eng.), Osaka University

PROFESSIONAL EXPERIENCE

1984-1989

Research Associate, Department of Applied Physics, Osaka University

1989-1995

Associate Professor, Yukawa Institute for Theoretical Physics, Kyoto University

1988-1989

Visiting Scientist, Max Planck Institute FKF (Stuttgart), Germany

1995-2007

Professor, Department of Applied Physics, Osaka University

2007-Present

Professor, Department of Physics, Kyoto University

HONORS AND AWARDS

1992

Japan IBM Science Award (co-awarded with S.-K. Yang)

1995

Nishina Memorial Prize (co-awarded with S.-K. Yang)

SELECTION OF PUBLICATIONS

"Characterization of a topological Mott insulator in one dimension"
T. Yoshida, R. Peters, S. Fujimoto and N. Kawakami,
Phys. Rev. Lett. 112, 196404-1-5 (May. 2014).
DOI: http://dx.doi.org/10.1103/PhysRevLett.112.196404

"Quantum Phase Transitions in the Hubbard Model on Triangular Lattice"
T. Yoshioka, A. Koga, and N. Kawakami,
Phys. Rev. Lett. 103, 036401-1-4 (Jul. 2009).
DOI: http://dx.doi.org/10.1103/PhysRevLett.103.036401

"Orbital-selective Mott transitions in the degenerate Hubbard model"
A. Koga, N. Kawakami, T. M. Rice and M. Sigrist,
Phys. Rev. Lett. 92, 216402-1-4 (May. 2004).
DOI: http://dx.doi.org/10.1103/PhysRevLett.92.216402

"Quantum Phase Transitions in the Shastry-Sutherland Model for SrCu₂ (BO3)₂"
A. Koga and N. Kawakami,
Phys. Rev. Lett. 84, 4461-4464 (May. 2000).
DOI: 10.1103/PhysRevLett.84.4461

"Luttinger Anomaly Exponent of the Momentum Distribution in the Hubbard Chain"
N. Kawakami and S.- K. Yang,
Phys. Lett. A 148, 359-362 (Aug. 1990).
DOI: 10.1016/0375-9601(90)90818-9

"Exact Expression of the Ground State Energy for the Symmetric Anderson Model"
N. Kawakami and A. Okiji,
Phys. Lett. A 86, 483-486 (Dec. 1981).
DOI: 10.1016/0375-9601(81)90663-0