Anisotropic Relaxation Dynamics in a Dipolar Fermi Gas Driven Out of Equilibrium

K. Aikawa, A. Frisch, M. Mark, S. Baier, R. Grimm, J. L. Bohn, D. S. Jin, G. M. Bruun, and F. Ferlaino
Phys. Rev. Lett. 113, 263201 – Published 23 December 2014
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Abstract

We report on the observation of a large anisotropy in the rethermalization dynamics of an ultracold dipolar Fermi gas driven out of equilibrium. Our system consists of an ultracold sample of strongly magnetic Er167 fermions, spin polarized in the lowest Zeeman sublevel. In this system, elastic collisions arise purely from universal dipolar scattering. Based on cross-dimensional rethermalization experiments, we observe a strong anisotropy of the scattering, which manifests itself in a large angular dependence of the thermal relaxation dynamics. Our result is in good agreement with recent theoretical predictions. Furthermore, we measure the rethermalization rate as a function of temperature for different angles and find that the suppression of collisions by Pauli blocking is not influenced by the dipole orientation.

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  • Received 6 May 2014

DOI:https://doi.org/10.1103/PhysRevLett.113.263201

© 2014 American Physical Society

Authors & Affiliations

K. Aikawa1, A. Frisch1, M. Mark1, S. Baier1, R. Grimm1,2, J. L. Bohn3, D. S. Jin3, G. M. Bruun4, and F. Ferlaino1,2

  • 1Institut für Experimentalphysik and Zentrum für Quantenphysik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria
  • 2Institut für Quantenoptik und Quanteninformation, Österreichische Akademie der Wissenschaften, 6020 Innsbruck, Austria
  • 3JILA, NIST, and Department of Physics, University of Colorado, Boulder, Colorado 80309, USA
  • 4Department of Physics and Astronomy, University of Aarhus, Ny Munkegade, DK-8000 Aarhus C, Denmark

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Issue

Vol. 113, Iss. 26 — 31 December 2014

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