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arXiv:1812.08832 · Physical Review A

Spin-energy correlation in degenerate weakly interacting Fermi gases

Saeed Pegahan, Jayampathi Kangara, Ilya Arakelyan, John E. Thomas

Published Jun 20, 2019• 14 citations
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Abstract

The time evolution of spin-energy correlations in a very weakly interacting Fermi gas of ${}^{6}$Li produces complex spin-density profiles, which are observed and quantitatively explained by a one-dimensional mean-field model. This system exhibits rich collective dynamics for exploring the interplay between spin, motion, Fermi statistics, and interactions in many-body systems.

DOI
10.1103/physreva.99.063620

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In this work, we study the dynamics of an atomic harmonically trapped large-spin Fermi gas in one dimension (1D). We investigate the interplay of different collision processes. Coherent spin oscillations, driven by spin-changing forward scattering are captured by a mean-field description and scale linearly with density regardless of the dimension of the system. Conversely, "incoherent" collision processes which e.g. lead to the damping of spin oscillations, behave differently. In the usual three-dimensional (3D) case, the rate of incoherent processes increases faster with density than mean-field effects, but in 1D it increases slower. This means, that in the 1D case, incoherent collisions become more important at lower densities. We study these effects by deriving and integrating a quantum Boltzmann equation. We demonstrate that the well known fact that in one dimension, interaction-induced correlations become more dominant at low densities can be observed in far-from-equilibrium spin dynamics.