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Nearly-flat bands with nontrivial topology
Kai Sun, Zheng-Cheng Gu, Hosho Katsura +1
We report the theoretical discovery of a large class of 2D tight-binding models containing nearly-flat bands with nonzero Chern numbers. In contrast with previous studies, where no…
Observation of the Magnon Hall Effect
Y. Onose, T. Ideue, H. Katsura +3
The Hall effect usually occurs when the Lorentz force acts on a charge current in a conductor in the presence of perpendicular magnetic field. On the other hand, neutral quasi-part…
Localization and Fractality in Inhomogeneous Quantum Walks with Self-Duality
Yutaka Shikano, Hosho Katsura
We introduce and study a class of discrete-time quantum walks on a one-dimensional lattice. In contrast to the standard homogeneous quantum walks, coin operators are inhomogeneous…
Extreme sensitivity of a frustrated quantum magnet: Cs_2CuCl_4
Oleg A. Starykh, Hosho Katsura, Leon Balents
We report a thorough theoretical study of the low temperature phase diagram of Cs_2CuCl_4, a spatially anisotropic spin S=1/2 triangular lattice antiferromagnet, in a magnetic fiel…
Continuous Matrix Product Ansatz for the One-Dimensional Bose Gas with Point Interaction
Isao Maruyama, Hosho Katsura
We study a matrix product representation of the Bethe ansatz state for the Lieb-Linger model describing the one-dimensional Bose gas with delta-function interaction. We first const…
Entanglement in valence-bond-solid states on symmetric graphs
Hosho Katsura, Naoki Kawashima, Anatol N. Kirillov +2
We study quantum entanglement in the ground state of the Affleck-Kennedy-Lieb-Tasaki (AKLT) model defined on two-dimensional graphs with reflection and/or inversion symmetry. The g…