Long range coherence of Bose gases in variable dimensionality

Shah, Robert (2021) Long range coherence of Bose gases in variable dimensionality. Doctoral thesis (PhD), University of Sussex.

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This thesis reports on our experimental investigation into the properties of condensed Bose gases across the 1D-3D regime. We review known theoretical models of quasi- condensates (1D) and the less understood crossover regime (the 3D regime being the Bose-Einstein condensate) and test them against our experimental findings. We use density ripples (a well-known phenomenon that occurs in quasi-condensates) as a tool to probe phase coherence of gases across the 1D-3D crossover. We have compared our results with simulations based on the theoretical models and find evidence that supports a hybrid model. There are a number of candidates (aspect ratio of the trapping potential, and dimensionless energies of chemical potential and temperature) proposed that determine “1D-ness” which we investigate and propose that the dimensionless chemical potential parameter is the most important. The experiment we have built also contains novel additions such as atom trapping printed circuit boards and 3D printed structures, which I report on this thesis.

Item Type: Thesis (Doctoral)
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics > QC0170 Atomic physics. Constitution and properties of matter Including molecular physics, relativity, quantum theory, and solid state physics
Depositing User: Library Cataloguing
Date Deposited: 11 Oct 2021 15:20
Last Modified: 11 Oct 2021 15:20
URI: http://sro.sussex.ac.uk/id/eprint/102258

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