Magnetism in artificial lattices |
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Authors: | K Kärkkäinen M Borgh M Manninen S M Reimann |
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Institution: | 1. Mathematical Physics, LTH, Lund University, 22100, Lund, Sweden 2. NanoScience Center, Department of Physics, University of Jyv?kyl?, 40351, Jyv?kyl?, Finland
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Abstract: | We compare magnetism in two artificial lattice structures, a
quantum dot array formed in a two-dimensional electron gas and an optical lattice loaded with repulsive, contact-interacting
fermionic atoms. When the tunneling between the
lattice sites is strong, both lattices are non-magnetic. With reduced tunneling in the tight-binding limit, the shell-filling
of the single-site quantum wells combined with Hund's rule determines the
magnetism. This leads to a systematic magnetic phase diagram with non-magnetic, ferromagnetic and antiferromagnetic phases. |
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Keywords: | 75 75 +a Magnetic properties of nanostructures 03 75 Ss Degenerate Fermi gases |
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