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Phys. Rev. Lett. 99, 026404 (2007) [4 pages]

Exact Many-Electron Ground States on the Diamond Hubbard Chain

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Zsolt Gulácsi1,2, Arno Kampf1, and Dieter Vollhardt1
1Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute for Physics, University of Augsburg, D-86135 Augsburg, Germany
2Department of Theoretical Physics, University of Debrecen, H-4010 Debrecen, Hungary

Received 30 March 2007; published 13 July 2007

Exact ground states of interacting electrons on the diamond Hubbard chain in a magnetic field are constructed which exhibit a wide range of properties such as flat-band ferromagnetism and correlation-induced metallic, half-metallic, or insulating behavior. The properties of these ground states can be tuned by changing the magnetic flux, local potentials, or electron density.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.026404
DOI:
10.1103/PhysRevLett.99.026404
PACS:
71.10.Fd, 71.27.+a
 
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