Research fields
1Strongly
correlated electron systems
1-1 Mott transition in the 2D Hubbard model
1-2 Universality of Mott transition
1-3 1D orbital excitation in perovskite vanadium
oxides
1-4 Quantum
melting of spin ice
2General
theory of nonequilibrium-nonlinear phenomena by electromagnetic field
2-1 Gauge-covariant Wigner representation of the
Keldysh formalism
2-2 Hall effect
2-3 Zener tunneling and breakdown
3Anomalous
Hall transport phenomena
3-1 Intrinsic Berry-phase
mechanism and extrinsic mechanisms
3-2 Universal scaling relation in dirty ferromagnetic metals
3-3 Anomalous Nernst-Ettingshausen and Leduc-Righi effects
4Spin
Hall effect
5Topological
nature of ferroelectric polarization
5-1 Quantum charge pumping
5-2 Quantum theory of capacitance
6Multiferroics
6-1 Cluster analysis of electric polarization of
magnetic origin
6-2 1D spin-1/2 multiferroics: chiral soliton
6-3 Spin cholesteric (chiral nematic) phase in
frustrated classical spin systems
6-4 Schwinger-boson mean-field theory of
low-dimensional frustrated quantum spin systems
6-5 Toroidal moment
and
many others.