Journal
EPL
Volume 91, Issue 5, Pages -Publisher
EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY
DOI: 10.1209/0295-5075/91/57007
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan [20740214]
- JSPS
- NSF [PHY05-51164]
- Grants-in-Aid for Scientific Research [20740214] Funding Source: KAKEN
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We introduce and study two classes of Hubbard models with magnetic flux or with spin-orbit coupling, which have a flat lowest band separated from other bands by a non-zero gap. We study the Chern number of the flat bands, and find that it is zero for the first class but can be non-trivial in the second. We also prove that the introduction of on-site Coulomb repulsion leads to ferromagnetism in both the classes. Copyright (C) EPLA, 2010
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