Flat band ferromagnetism without connectivity conditions in the flat band

Miklos Gulácsi, György Kovács, Zsolt Gulácsi

Research output: Contribution to journalArticle

5 Citations (Scopus)


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 satisfying the connectivity conditions, is always ferromagnetic. Without the connectivity conditions on the flat band, the system is non-magnetic. We show that this is not always true. The reason is connected to a peculiar behavior of the band situated just above the flat band.

Original languageEnglish
Article number57005
Issue number5
Publication statusPublished - Sep 2014


ASJC Scopus subject areas

  • Physics and Astronomy(all)

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