An extension of Tasaki's flat-band Hubbard model
Teppei Sekizawa
TL;DR
This paper introduces a new class of flat-band Hubbard models extending Tasaki's models, demonstrating saturated ferromagnetic ground states at two different electron fillings for various parameters.
Contribution
It presents an extended class of flat-band Hubbard models with ferromagnetic ground states at multiple electron numbers, expanding on Tasaki's original models.
Findings
Models exhibit saturated ferromagnetism at two distinct electron fillings.
Ground states are stable across different parameter values.
Extension broadens applicability of flat-band ferromagnetism theories.
Abstract
We present a new class of flat-band Hubbard models which have saturated ferromagnetic ground states at two distinct electron numbers for different values of parameters. The models are extensions of Tasaki's flat-band models.
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