9 citations · 17 across the 3 of their papers we have counts for
3 papers
cond-mat.str-el2015★ 5 cited
Pentagon chain in external fields
Gyorgy Kovacs, Zsolt Gulacsi
We consider a pentagon chain described by a Hubbard type of model considered under periodic boundary conditions. The system i) is placed in an external magnetic field perpendicular…
cond-mat.str-el2014★ 3 cited
Flat band ferromagnetism without connectivity conditions in the flat band
Miklos Gulacsi, Gyorgy Kovacs, Zsolt Gulacsi
It is known that a system which exhibits a half filled lowest flat band and the localized one-particle Wannier states on the flat band satisfy the connectivity conditions, is alway…
cond-mat.str-el2014★ 9 cited
Exact ferromagnetic ground state of pentagon chains
Miklos Gulacsi, Gyorgy Kovacs, Zsolt Gulacsi
We model conducting pentagon chains with a multi orbital Hubbard model and prove that well below half filling exact ferromagnetic ground states appear. The rigorous method we use i…