Flat band ferromagnetism without connectivity conditions in the flat band

Flat band ferromagnetism without connectivity conditions in the flat band

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...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Europhysics letters 2014-09, Vol.107 (5), p.57005-p1-57005-p6
Hauptverfasser: Gulacsi, Miklos, Kovacs, Gyorgy, Gulacsi, Zsolt
Format: Artikel
Sprache:eng
Schlagworte:
03.65.Aa
71.10.Fd
71.27.+a
Ferromagnetism
Flats
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung: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.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/107/57005