229 citations · 764 across the 21 of their papers we have counts for
10 papers · 1 filter
Emergent One-Dimensional Helical Channel in Higher-Order Topological Insulators with Step Edges
Akihiko Sekine, Manabu Ohtomo, Kenichi Kawaguchi +1
We study theoretically the electronic structure of three-dimensional (3D) higher-order topological insulators in the presence of step edges. We numerically find that a 1D conductin…
Electronic properties of the steps in bilayer Td-WTe2
Mari Ohfuchi, Akihiko Sekine, Manabu Ohtomo +1
Monolayer WTe2 stripes are quantum spin Hall (QSH) insulators. Density functional theory was used for investigating the electronic properties of the stripes and steps in bilayer Td…
Axion Electrodynamics in Topological Materials
Akihiko Sekine, Kentaro Nomura
One of the intriguing properties characteristic to three-dimensional topological materials is the topological magnetoelectric phenomena arising from a topological term called the $…
Valley Pumping via Edge States and the Nonlocal Valley Hall Effect in Two-Dimensional Semiconductors
Akihiko Sekine, Allan H. MacDonald
Recent experiments have studied the temperature and gate voltage dependence of nonlocal transport in bilayer graphene, identifying features thought to be associated with the two-di…
Quantum Kinetic Theory of Thermoelectric and Thermal Transport in a Magnetic Field
Akihiko Sekine, Naoto Nagaosa
We present a general quantum kinetic theory that accounts for the interplay between a temperature gradient, momentum-space Berry curvatures of Bloch electrons, and Bloch-state scat…
Tunable Charged Domain Wall from Topological Confinement in Nodal-Line Semimetals
Akihiko Sekine, Naoto Nagaosa
We study theoretically the electronic structure of topological nodal-line semimetals. We show that, in the presence of a gap-opening spatially dependent mass term that forms a doma…
Valley-Dependent Magnetoresistance in Two-Dimensional Semiconductors
Akihiko Sekine, Allan H. MacDonald
We show theoretically that two-dimensional direct-gap semiconductors with a valley degree of freedom, including monolayer transition-metal dichalcogenides and gapped bilayer graphe…
Quantum Kinetic Theory of the Chiral Anomaly
Akihiko Sekine, Dimitrie Culcer, Allan H. MacDonald
We present a general quantum kinetic theory of low-field magnetotransport in weakly disordered crystals that accounts fully for the interplay between electric-field induced interba…
Inter-band Coherence Response to Electric Fields in Crystals
Dimitrie Culcer, Akihiko Sekine, Allan H. MacDonald
In solid state conductors, linear response to a steady electric field is normally dominated by Bloch state occupation number changes that are correlated with group velocity and lea…
Chiral Gravitomagnetic Effect in Topological Superconductors and Superfluids
Akihiko Sekine
We theoretically search for dynamical cross-correlated responses of three-dimensional topological superconductors and superfluids. It has been suggested that a gravitational topolo…