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Demagnetization dynamics of noninteracting trapped fermions

Andrew P. Koller, Joshua Mundinger, Michael L. Wall, and Ana Maria Rey
Phys. Rev. A 92, 033608 – Published 10 September 2015

Abstract

Motivated by several experimental efforts to understand spin diffusion and transport in ultracold fermionic gases, we study the spin dynamics of initially spin-polarized ensembles of harmonically trapped noninteracting spin-1/2 fermionic atoms, subjected to a magnetic field gradient. We obtain simple analytic expressions for spin observables in the presence of both constant and linear magnetic field gradients, with and without a spin-echo pulse and at zero and finite temperatures. The analysis shows the relevance of spin-motional coupling in the noninteracting regime, where the demagnetization decay rate at short times can be faster than the experimentally measured rates in the strongly interacting regime under similar trapping conditions. Our calculations also show that particle motion limits the ability of a spin-echo pulse to remove the effect of magnetic field inhomogeneity and that a spin-echo pulse can instead lead to an increased decay of magnetization at times comparable to the trapping period.

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  • Received 17 July 2015

DOI:https://doi.org/10.1103/PhysRevA.92.033608

©2015 American Physical Society

Authors & Affiliations

Andrew P. Koller1, Joshua Mundinger2, Michael L. Wall1, and Ana Maria Rey1

  • 1JILA, NIST, Department of Physics, University of Colorado, 440 UCB, Boulder, Colorado 80309, USA
  • 2Department of Mathematics and Statistics, Swarthmore College, 500 College Avenue, Swarthmore, Pennsylvania 19081, USA

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Issue

Vol. 92, Iss. 3 — September 2015

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