64 citations · 423 across the 19 of their papers we have counts for
19 papers
Topological Identification of Spin-1/2 Two-Leg Ladder with Four-Spin Ring Exchange
I. Maruyama, T. Hirano, Y. Hatsugai
A spin-1/2 two-leg ladder with four-spin ring exchange is studied by quantized Berry phases, used as local order parameters. Reflecting local objects, non-trivial () Berry phase…
Quantized Berry Phases for a Local Characterization of Spin Liquids in Frustrated Spin Systems
Yasuhiro Hatsugai
Recently by using quantized Berry phases, a prescription for a local characterization of gapped topological insulators is given. One requires the ground state is gapped and is inva…
Superconductivity and Abelian Chiral Anomalies
Y. Hatsugai, S. Ryu, M. Kohmoto
Motivated by the geometric character of spin Hall conductance, the topological invariants of generic superconductivity are discussed based on the Bogoliuvov-de Gennes equation on l…
Zero-modes in the random hopping model
P. W. Brouwer, E. Racine, A. Furusaki +3
If the number of lattice sites is odd, a quantum particle hopping on a bipartite lattice with random hopping between the two sublattices only is guaranteed to have an eigenstate at…
Anisotropy on the Fermi Surface of the Two-Dimensional Hubbard Model
Y. Otsuka, Y. Morita, Y. Hatsugai
We investigate anisotropic charge fluctuations in the two-dimensional Hubbard model at half filling. By the quantum Monte Carlo method, we calculate a momentum-resolved charge comp…
Mott Transition in the Two-Dimensional Flux Phase
Y. Otsuka, Y. Hatsugai
Effects of the electron-electron interaction in the two-dimensional flux phase are investigated. We treat the half-filled Hubbard model with a magnetic flux per plaquette by th…