Magnetism and Hund's rule in an optical lattice with cold fermions

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Kärkkäinen, K., Borgh, M., 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

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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:	http://www.scopus.com/inward/record.url?...
Depositing User:	LivePure Connector
Date Deposited:	01 Aug 2022 09:30
Last Modified:	28 Mar 2025 11:35
URI:	https://ueaeprints.uea.ac.uk/id/eprint/87014
DOI:	10.1088/1367-2630/9/2/033

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