Competition between Pairing and Ferromagnetic Instabilities in Ultracold Fermi Gases near Feshbach Resonances

Journal Article · Fri Feb 04 00:00:00 EST 2011 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.106.050402· OSTI ID:21532269

Pekker, David; Babadi, Mehrtash; Pollet, Lode; Demler, Eugene ^[1]; Sensarma, Rajdeep ^[2]; Zinner, Nikolaj ^[1]; Zwierlein, Martin W ^[3]

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1. Physics Department, Harvard University, Cambridge, Massachusetts 02138 (United States)
2. Condensed Matter Theory Center, University of Maryland, College Park, Maryland 20742 (United States)
3. MIT-Harvard Center for Ultracold Atoms, Research Laboratory of Electronics, and Department of Physics, Cambridge, Massachusetts 02139 (United States)

We study the quench dynamics of a two-component ultracold Fermi gas from the weak into the strong interaction regime, where the short time dynamics are governed by the exponential growth rate of unstable collective modes. We obtain an effective interaction that takes into account both Pauli blocking and the energy dependence of the scattering amplitude near a Feshbach resonance. Using this interaction we analyze the competing instabilities towards Stoner ferromagnetism and pairing.

• OSTI ID: 21532269
• Journal Information: Physical Review Letters, Vol. 106, Issue 5; Other Information: DOI: 10.1103/PhysRevLett.106.050402; (c) 2011 American Institute of Physics; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ENERGY DEPENDENCE
FERMI GAS
FERROMAGNETISM
INSTABILITY
PAIRING INTERACTIONS
RESONANCE
SCATTERING AMPLITUDES
STRONG INTERACTIONS
AMPLITUDES
BASIC INTERACTIONS
INTERACTIONS
MAGNETISM