4 citations · 6 across the 4 of their papers we have counts for
4 papers
Existence of the Spin-Wave Gap in a Deformed Flat-Band Hubbard Model
Makoto Homma
We consider a deformed flat-band Hubbard model under a periodic boundary condition in arbitrary dimensions. We show that the ground state is only all-spin-up or -down state. We obt…
Gapless Excitation above a Domain Wall Ground State in a Flat Band Hubbard Model
Makoto Homma, Chigak Itoi
We construct a set of exact ground states with a localized ferromagnetic domain wall and with an extended spiral structure in a deformed flat-band Hubbard model in arbitrary dimens…
Ferromagnetic Domain Wall Ground States in One-Dimensional Deformed Flat-Band Hubbard Model
Makoto Homma, Chigak Itoi
We construct a set of exact ground states with a localized ferromagnetic domain wall and an extended spiral structure in a quasi-one-dimensional deformed flat-band Hubbard model. I…
Exact solutions of domain wall and spiral ground states in Hubbard models
Makoto Homma, Chigak Itoi
We construct a set of exact ground states with a localized ferromagnetic domain wall and an extended spiral structure in a deformed flat-band Hubbard model. In the case of quarter…