Unified Description of Dynamics of a Repulsive Two-Component Fermi Gas

Piotr T. Grochowski, Tomasz Karpiuk, Mirosław Brewczyk, and Kazimierz Rzążewski
Phys. Rev. Lett. 119, 215303 – Published 21 November 2017

Abstract

We study a binary spin mixture of a zero-temperature repulsively interacting Li6 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)], 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.

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  • Received 28 April 2017

DOI:https://doi.org/10.1103/PhysRevLett.119.215303

© 2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied PhysicsAtomic, Molecular & Optical

Authors & Affiliations

Piotr T. Grochowski1,*, Tomasz Karpiuk2,†, Mirosław Brewczyk2,‡, and Kazimierz Rzążewski1,§

  • 1Center for Theoretical Physics, Polish Academy of Sciences, Aleja Lotników 32/46, 02-668 Warsaw, Poland
  • 2Wydział Fizyki, Uniwersytet w Białymstoku, ul. K. Ciołkowskiego 1L, 15-245 Białystok, Poland

  • *piotr@cft.edu.pl
  • t.karpiuk@uwb.edu.pl
  • m.brewczyk@uwb.edu.pl
  • §kazik@cft.edu.pl

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Issue

Vol. 119, Iss. 21 — 24 November 2017

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