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arXiv:1605.07850 · Nature Physics

Exploring the ferromagnetic behaviour of a repulsive Fermi gas through spin dynamics

Giacomo Valtolina, Francesco Scazza, Andrea Amico, A. Burchianti, Alessio Recati, Tilman Enss, M. Inguscio, Matteo Zaccanti, G. Roati

Published Apr 24, 2017• 113 citations
arXivHTMLPDF
DOI
10.1038/nphys4108

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We study a binary spin mixture of a zero-temperature repulsively interacting ^{6}Li atoms using both the atomic-orbital and density-functional approaches. The gas is initially prepared in a configuration of two magnetic domains and we determine the frequency of the spin-dipole oscillations which are emerging after the repulsive barrier, initially separating the domains, is removed. We find, in agreement with recent experiment [G. Valtolina et al., Nat. Phys. 13, 704 (2017)NPAHAX1745-247310.1038/nphys4108], the occurrence of a ferromagnetic instability in an atomic gas while the interaction strength between different spin states is increased, after which the system becomes ferromagnetic. The ferromagnetic instability is preceded by the softening of the spin-dipole mode.