Ferromagnetism of the repulsive atomic Fermi gas: three-body recombination and domain formation

Ilia Zintchenko, Lei Wang () and Matthias Troyer
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Ilia Zintchenko: Theoretische Physik, ETH Zurich
Lei Wang: Theoretische Physik, ETH Zurich
Matthias Troyer: Theoretische Physik, ETH Zurich

The European Physical Journal B: Condensed Matter and Complex Systems, 2016, vol. 89, issue 8, 1-5

Abstract: Abstract The simplest model for itinerant ferromagnetism, the Stoner model, has so far eluded experimental observation in repulsive ultracold fermions due to rapid three-body recombination at large scattering lengths. Here we show that a ferromagnetic phase can be stabilised by imposing a moderate optical lattice. The reduced kinetic energy drop upon formation of a polarized phase in an optical lattice extends the ferromagnetic phase to smaller scattering lengths where three-body recombination is small enough to permit experimental detection of the phase. We also show, using time dependent density functional theory, that in such a setup ferromagnetic domains emerge rapidly from a paramagnetic initial state.

Keywords: Solid; State; and; Materials (search for similar items in EconPapers)
Date: 2016
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DOI: 10.1140/epjb/e2016-70302-5

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