2.2k citations · 4.3k across the 19 of their papers we have counts for
6 papers · 1 filter
Quantum spin Hall effect in a transition metal oxide Na2IrO3
Atsuo Shitade, Hosho Katsura, Jan Kunes +3
We study theoretically the electronic states in a transition metal oxide NaIrO, in which both the spin-orbit interaction and the electron correlation play crucial role…
Current-induced dynamics of spiral magnet
Kohei Goto, Hosho Katsura, Naoto Nagaosa
We study the dynamics of the spiral magnet under the charge current by solving the Landau-Lifshitz-Gilbert equation numerically. In the steady state, the current induces…
Block Spin Density Matrix of the Inhomogeneous AKLT Model
Ying Xu, Hosho Katsura, Takaaki Hirano +1
We study the inhomogeneous generalization of a 1-dimensional AKLT spin chain model. Spins at each lattice site could be different. Under certain conditions, the ground state of thi…
Quantum Dynamics of Multiferroic Helimagnets: a Schwinger-Boson Approach
Hosho Katsura, Shigeki Onoda, Jung Hoon Han +1
We study the quantum dynamics/fluctuation of the cycloidal helical magnet in terms of the Schwinger boson approach. In sharp contrast to the classical fluctuation, the quantum fluc…
Degeneracy and Consistency Condition of Berry phases: Gap Closing under the Twist
Takaaki Hirano, Hosho Katsura, Yasuhiro Hatsugai
We have discussed a consistency condition of Berry phases defined by a local gauge twist and spatial symmetries of the many body system. It imposes a non trivial gap closing condit…
Entanglement and Density Matrix of a Block of Spins in AKLT Model
Ying Xu, Hosho Katsura, Takaaki Hirano +1
We study a 1-dimensional AKLT spin chain, consisting of spins in the bulk and at both ends. The unique ground state of this AKLT model is described by the Valence-Bond-So…