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First-principles investigation of magnetic and transport properties in hole-doped shandite compounds CoInSnS
Yuki Yanagi, Junya Ikeda, Kohei Fujiwara +3
Co-based shandite CoSnS is a representative example of magnetic Weyl semimetals showing rich transport phenomena. We thoroughly investigate magnetic and transport prope…
Chiral Magnetic Effect and Anomalous Hall Effect in Antiferromagnetic Insulators with Spin-Orbit Coupling
Akihiko Sekine, Kentaro Nomura
We search for dynamical magnetoelectric phenomena in three-dimensional correlated systems with spin-orbit coupling. We focus on the antiferromagnetic insulator phases where the dyn…
Stability of Multinode Dirac Semimetals against Strong Long-Range Correlations
Akihiko Sekine, Kentaro Nomura
We study the stability of Dirac semimetals with nodes in three spatial dimensions against strong Coulomb interactions. We particularly study the cases of and …
Axionic Antiferromagnetic Insulator Phase in a Correlated and Spin-Orbit Coupled System
Akihiko Sekine, Kentaro Nomura
We study theoretically a three-dimensional correlated and spin-orbit coupled system, the half-filled extended Fu-Kane-Mele-Hubbard model on a diamond lattice, focusing on the topol…
Phase structure of topological insulators by lattice strong-coupling expansion
Yasufumi Araki, Taro Kimura, Akihiko Sekine +2
The effect of the strong electron correlation on the topological phase structure of 2-dimensional (2D) and 3D topological insulators is investigated, in terms of lattice gauge theo…
Weyl Semimetal in the Strong Coulomb Interaction Limit
Akihiko Sekine, Kentaro Nomura
We study the effects of strong long-range Coulomb interactions in a Weyl semimetal. We consider a three-dimensional (3D) Dirac fermion system on a lattice with a time-reversa…
Strong Coupling Expansion in a Correlated Three-Dimensional Topological Insulator
Akihiko Sekine, Takashi Z. Nakano, Yasufumi Araki +1
Motivated by recent studies which show that topological phases may emerge in strongly correlated electron systems, we theoretically study the strong electron correlation effect in…
Electron Correlation Induced Spontaneous Symmetry Breaking and Weyl Semimetal Phase in a Strongly Spin-Orbit Coupled System
Akihiko Sekine, Kentaro Nomura
We study theoretically the electron correlation effect in a three-dimensional Dirac fermion system which describes a topologically nontrivial state. It is shown within the mean-fie…
Theory of electric polarization in multi-orbital Mott insulators
Maxim Mostovoy, Kentaro Nomura, Naoto Nagaosa
The interaction between the electric field, E, and spins in multi-orbital Mott insulators is studied theoretically. We find a generic dynamical coupling mechanism, which works for…
Fractional Quantum Hall Effects in Graphene and Its Bilayer
Naokazu Shibata, Kentaro Nomura
Single-layer and Bilayer of graphene are new classes of two-dimensional electron systems with unconventional band structures and valley degrees of freedom. The ground states and ex…