Scientific Results

Stability of resonantly interacting heavy-light Fermi mixtures

Year: 2012

Authors: Astrakharchik G.E., Giorgini S., Boronat J.

Autors Affiliation: Departament de Física i Enginyeria Nuclear, Universitat Politècnica de Catalunya, Campus Nord B4-B5, E-08034 Barcelona, Spain; Università di Trento, Dipartimento di Fisica, I-38050 Trento, Italy; INO CNR BEC Ctr, I-38050 Trento, Italy

Abstract: We investigate a two-component mixture of resonantly interacting Fermi gases as a function of the ratio k of the heavy to the light mass of the two species. The diffusion Monte Carlo method is used to calculate the ground-state energy and the pair correlation function starting from two different guiding wave functions, which describe, respectively, the superfluid and the normal state of the gas. Results show that the mixture is stable and superfluid for mass ratios smaller than the critical value k(c) = 13 +/- 1. For larger values of k simulations utilizing the wave function of the normal state are unstable towards cluster formation. The relevant cluster states driving the instability appear to be formed by one light particle and two or more heavy particles within distances on the order of the range of the interatomic potential. The small overlap between the wave function of the trimer bound state and the guiding wave function used to describe the superfluid state produces the unphysical stability of the superfluid gas above k(c).


Volume: 86 (17)      Pages from: 174518  to: 174518

More Information: We acknowledge partial financial support from the DGI (Spain) Grant No. FIS2011-25275 and Generalitat de Catalunya Grant No. 2009SGR-1003. G.E.A. acknowledges support from the Spanish MEC through the Ramon y Cajal fellowship program. S.G. acknowledges support by ERC through the QGBE grant.
DOI: 10.1103/PhysRevB.86.174518

Citations: 4
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