Scientific Results

Collective Modes in a Unitary Fermi Gas across the Superfluid Phase Transition

Year: 2013

Authors: Tey M.K., Sidorenkov L.A., Sánchez Guajardo E.R., Grimm R., Ku M.J.H., Zwierlein M.W., Hou Y.-H., Pitaevskii L.P., Stringari S.

Autors Affiliation: Institut für Quantenoptik und Quanteninformation (IQOQI), Ŏsterreichische Akademie der Wissenschaften and Institut für Experimentalphysik, Universität Innsbruck, 6020 Innsbruck, Austria; MIT-Harvard Center for Ultracold Atoms, Research Laboratory of Electronics, and Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA; Dipartimento di Fisica, Università di Trento and INO-CNR BEC Center, I-38123 Povo, Italy; Kapitza Institute for Physical Problems RAS, Kosygina 2, 119334 Moscow, Russia

Abstract: We provide a joint theoretical and experimental investigation of the temperature dependence of the collective oscillations of first sound nature exhibited by a highly elongated harmonically trapped Fermi gas at unitarity, including the region below the critical temperature for superfluidity. Differently from the lowest axial breathing mode, the hydrodynamic frequencies of the higher-nodal excitations show a temperature dependence, which is calculated starting from Landau two-fluid theory and using the available experimental knowledge of the equation of state. The experimental results agree with high accuracy with the predictions of theory and provide the first evidence for the temperature dependence of the collective frequencies near the superfluid phase transition. DOI: 10.1103/PhysRevLett.110.055303


Volume: 110 (5)      Pages from: 055303  to: 055303

More Information: We would like to thank John Thomas for useful discussions and Florian Schreck for discussion and experimental support. The Innsbruck team acknowledges support from the Austrian Science Fund (FWF) within SFB FoQuS (Project No. F4004-N16). The Trento team acknowledges support from the European Research Council through the project QGBE. The MIT work was supported by the NSF, AFOSR, ONR, ARO with funding from the DARPA OLE program, and the David and Lucile Packard Foundation.
DOI: 10.1103/PhysRevLett.110.055303

Citations: 48
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