{"id":145,"date":"2025-10-22T10:06:18","date_gmt":"2025-10-22T08:06:18","guid":{"rendered":"https:\/\/gqm.lpl.univ-paris13.fr\/?page_id=145"},"modified":"2025-12-11T09:43:46","modified_gmt":"2025-12-11T08:43:46","slug":"the-strontium-87-lab","status":"publish","type":"page","link":"https:\/\/gqm.lpl.univ-paris13.fr\/index.php\/the-strontium-87-lab\/","title":{"rendered":"The strontium 87 lab"},"content":{"rendered":"\n
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The strontium 87 lab<\/h2>\n<\/div><\/div>\n\n\n\n

Quantum magnetism in ensembles of large spin atoms present possibilities beyond those offered by spin \u00bd electron gases and effective spin \u00bd atoms, such as magnetic phases with topological properties applicable to quantum information manipulation, or new mechanisms for the emergence of superfluidity. We have built an experimental apparatus that produces ultracold degenerate fermionic gases of strontium 87, with large spin F = 9\/2, which we will arranged on periodic potentials produced by interfering lasers (optical lattices).<\/p>\n\n\n\n

The large spin of strontium will enable us to emulate situations analog to those encountered by (spin 1\/2) electrons in crystalline materials, but also a whole new set of situations that should contrast markedly with those. Furthermore, strontium 87 presents original interaction properties. Indeed, contrary to most species (e.g., chromium), the interactions between two particles do not depend on their spin projections: the Pauli principle, preventing two identical fermionic particles to meet each other and interact, is the only mechanism responsible for magnetism, which leads to an uncommon SU(N) spin rotation symmetry with large consequences on the magnetism.<\/p>\n\n\n\n

Our system<\/h4>\n\n\n\n

On our system, we expect that novel magnetic states will emerge from the interplay between the lattice potential symmetry and the SU(N) spin rotation symmetry: while cubic lattices are suited for long range antiferromagnetic ordering of spin 1\/2 particles, they are not expected to be for a large number of spin states. Conversely, triangular geometry may be more suited to antiferromagnetic ordering with three spin states than two. We aim at exploring the effect of these original properties on:<\/p>\n\n\n\n