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Kärkkäinen, K., Borgh, M. 
ORCID: https://orcid.org/0000-0003-4243-7051, Manninen, M. and Reimann, S. M.
(2007)
Magnetism and Hund's rule in an optical lattice with cold fermions.
New Journal of Physics, 9.
ISSN 1367-2630
Abstract
We demonstrate that a two-dimensional (2D) optical lattice loaded with repulsive, contact-interacting fermions shows a rich and systematic magnetic phase diagram. Trapping a few (N ≤ 12) fermions in each of the single-site minima of the optical lattice, we find that the shell structure in these quantum wells determines the magnetism. In a shallow lattice, the tunnelling between the single wells is strong, and the lattice is non-magnetic (NM). For deeper lattices, however, the shell filling of the single wells with fermionic atoms determines the magnetism. As a consequence of Hund's first rule, the interaction energy is lowered by maximizing the number of atoms of the same species. This leads to a systematic sequence of NM, ferromagnetic (F) and antiferromagnetic (AF) phases.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | physics and astronomy(all) ,/dk/atira/pure/subjectarea/asjc/3100 |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 01 Aug 2022 09:30 |
| Last Modified: | 23 Oct 2022 04:06 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/87014 |
| DOI: | 10.1088/1367-2630/9/2/033 |
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