Chandrasekhar-Clogston limit and critical polarization in a Fermi-Bose superfluid mixture

Year: 2014

Authors: Ozawa T., Recati A., Delehaye M., Chevy F., Stringari S.

Autors Affiliation: INO-CNR BEC Center and Dipartimento di Fisica, Università di Trento, I-38123 Povo, Italy; Laboratoire Kastler-Brossel, École Normale Supérieure, CNRS and UPMC, 24 rue Lhomond, 75005 Paris, France

Abstract: We study mixtures of a population-imbalanced, strongly interacting Fermi gas and of a Bose-Einstein condensed gas at zero temperature. In the homogeneous case, we find that the Chandrasekhar-Clogston critical polarization for the onset of instability of Fermi superfluidity is enhanced due to the interaction with the bosons. Predictions for the critical polarization are also given in the trapped case, with a special focus on the situation of equal Fermi-Bose and Bose-Bose coupling constants, where the density of fermions becomes flat in the center of the trap. This regime can be realized experimentally using Feshbach resonances and is well suited to investigate the emergence of exotic configurations, such as the occurrence of spin domains or the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase.


Volume: 90 (4)      Pages from: 043608-1  to: 043608-5

More Information: We thank Igor Ferrier-Barbut and Christophe Salomon for useful discussions. We also thank Stefano Giorgini for insightful comments. This work was supported by the ERC through the QGBE grant and by Provincia Autonoma di Trento, and by the ERC Ferlodim and Thermodynamix, the Ile de France Nano-K (Contract Atomix), and by an Institut de France Louis D. Prize.
DOI: 10.1103/PhysRevA.90.043608

Citations: 25
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