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A: Fachverband Atomphysik
A 10: Collisions, scattering and correlation phenomena
A 10.6: Vortrag
Dienstag, 10. März 2020, 15:30–15:45, a320
Stable longitudinal spin domains in a one-dimensional nondegenerate gas — •Sean D. Graham1, Dorna Niroomand1, Robert J. Ragan2, and Jeffrey M. McGuirk1 — 1Simon Fraser University, Burnaby, Canada — 2University of Wisconsin - La Crosse, La Crosse, USA
We demonstrate that linear spin-dependent potentials can stabilize longitudinal spin domains in a weakly-interacting gas of 87Rb atoms above quantum degeneracy. Coherent spin-rotating interactions are modified by a small spin-dependent potential that varies the local Larmor precession. Stable domains are observed when the gradient of the linear spin-dependent potential opposes the initial spin gradient within the domain wall. Experimental results over a range of cloud temperatures, densities, and linear spin-dependent potentials are compared to solutions of the quantum Boltzmann equation in the hydrodynamic and collisionless regimes. In the hydrodynamic regime, the measured stabilizing gradients agree well with the quantum Boltzmann theory. However, the stabilizing gradients in the collisionless regime deviate from the quantum Boltzmann theory as the mean free path becomes comparable to the domain-wall width. We extend this domain stabilization technique by stabilizing one-dimensional dipolar, quadrupolar, and hexapolar spatial spin modes using spin-dependent potentials that are linear within every domain wall.