Itinerant Ferromagnetism of a Repulsive Atomic Fermi Gas: A Quantum Monte Carlo Study

Year: 2010

Authors: Pilati S., Bertaina G., Giorgini S., Troyer M.

Autors Affiliation: Swiss Fed Inst Technol, CH-8093 Zurich, Switzerland; Univ Trent, Dipartimento Fis, I-38050 Trento, Italy; INO CNR BEC Ctr, I-38050 Trento, Italy.

Abstract: We investigate the phase diagram of a two-component repulsive Fermi gas at T = 0 by means of quantum Monte Carlo simulations. Both purely repulsive and resonant attractive model potentials are considered in order to analyze the limits of the universal regime where the details of interatomic forces can be neglected. The equation of state of both balanced and unbalanced systems is calculated as a function of the interaction strength and the critical density for the onset of ferromagnetism is determined. The energy of the strongly polarized gas is calculated and parametrized in terms of the physical properties of repulsive polarons, which are relevant for the stability of the fully ferromagnetic state. Finally, we analyze the phase diagram in the interaction-polarization plane under the assumption that only phases with homogeneous magnetization can be produced.

Journal/Review: PHYSICAL REVIEW LETTERS

Volume: 105 (3)      Pages from: 30405-1  to: 30405-4

More Information: We acknowledge discussions with A. Recati. This work was supported by the Swiss National Science Foundation and by a grant from the Army Research Office with funding from the DARPA OLE program. As part of the European Science Foundation EUROCORES Program EuroQUAM-FerMix’’ it was supported by funds from the CNR and the EC Sixth Framework Programme.
KeyWords: Many-body Problem; Thermodynamics
DOI: 10.1103/PhysRevLett.105.030405

Citations: 134
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