Longitudinal spin diffusion of a two-domain ultracold non-degenerate bose gas

Resource type
Thesis type
(Thesis) M.Sc.
Date created
2022-03-30
Authors/Contributors
Abstract
This thesis explores the effects of domain wall width on a two-domain ultracold non-degenerate trapped gas of Rubidium-87. A gas of Rubidium-87 atoms is evaporatively cooled to just above quantum degeneracy. Atoms are then prepared in a configuration of two longitudinal spin domains separated by a coherent helical domain wall, and spin diffusion is observed. We demonstrate the slowing of spin wave oscillations as domain wall width is increased, as a result of increased coherent spin interactions. In the presence of a linear potential gradient, spin domains are stabilized and reach a maximum lifetime near the equilibrium domain wall width. Equilibrium domain wall widths are determined through analysis of the domain wall width relaxation rate and results show reasonably good agreement with hydrodynamic approximations of the quantum Boltzmann equation.
Document
Extent
58 pages.
Identifier
etd21889
Copyright statement
Copyright is held by the author(s).
Permissions
This thesis may be printed or downloaded for non-commercial research and scholarly purposes.
Supervisor or Senior Supervisor
Thesis advisor: McGuirk, Jeffrey
Language
English
Member of collection
Attachment Size
etd21889.pdf 4.46 MB