147 citations · 871 across the 26 of their papers we have counts for
26 papers
Excited States beyond Mott Gap in Half-Filled-Band Hubbard Model
Hisatoshi Yokoyama, Kenji Kobayashi, Tsutomu Watanabe +1
In connection with recent experiments on excitation in which Mott insulators change to conductors, we study the properties of excited states beyond the Mott gap as quasi-stationary…
Staggered Flux State in Two-Dimensional Hubbard Models
Hisatoshi Yokoyama, Shun Tamura, Masao Ogata
The stability and other properties of a staggered flux (SF) state or a correlated d-density wave state are studied for the Hubbard (t-t'-U) model on extended square lattices, as a…
Band-Renormalization Effects and Predominant Antiferromagnetic Order in Two-Dimensional Hubbard Model
Ryo Sato, Hisatoshi Yokoyama
Band renormalization effects (BRE) are comprehensively studied for a mixed state of dx2-y2-wave superconducting (d-SC) and antiferromagnetic (AF) orders, in addition to simple d-SC…
Loop Current and Antiferromagnetic States in Fermionic Hubbard Model with Staggered Flux at Half Filling
Yuta Toga, Hisatoshi Yokoyama
Anticipating realization of interacting fermions in an optical lattice with a large gauge field, we consider phase transitions and loop currents in a two-dimensional S=1/2 fermioni…
Drude and Superconducting Weights and Mott Transitions in Variation Theory
Shun Tamura, Hisatoshi Yokoyama
Drude weight () is a useful measure to distinguish a metal from an insulator. However, has not been justifiably estimated by the variation theory for long, since Millis and…
Variational Approach to Localization Length for Two-Dimensional Hubbard Model
Shun Tamura, Yokoyama Hisatoshi
As a measure to ascertain whether a system is metallic or insulating, localization length , which represents the spread of electron distribution, can be a useful quantity, esp…