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Ferromagnetism without flat bands in thin armchair nanoribbons

✍ Scribed by R. Trencsényi; Z. Gulácsi

Book ID
111623417
Publisher
Springer
Year
2010
Tongue
English
Weight
369 KB
Volume
75
Category
Article
ISSN
1434-6036

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Robustness of the ferromagnetism in flat
Robustness of the ferromagnetism in flat bands
✍ Koichi Kusakabe; Hideo Aoki 📂 Article 📅 1994 🏛 Elsevier Science 🌐 English ⚖ 167 KB

Ferromagnetism in the Hubbard models having flat bands proposed by Mielke and by Tasaki is shown to survive even when the bands become dispersive in a finite region in the phase diagram against Hubbard U and the band parameter. The charge gap in the excitation spectrum and a finite spin stiffness in