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cond-mat.str-el2004
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…
cond-mat.str-el2004
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…