Thermal Phase Fluctuations in Narrow Superfluid Rings
Abstract
Using matter-wave interference, we have investigated thermal phase fluctuations in narrow coplanar, concentric rings of ultracold fermionic superfluids. We found that the correlation length decreases with number density, consistent with theoretical expectations. We also observed that increasing the coupling between the rings leads to greater overall coherence in the system. The phase fluctuations increased with a change from periodic to closed boundary conditions as we applied a potential barrier at one point in a ring. These results are relevant for the implementation of proposals to utilize ultracold quantum gases in large and elongated circuit-like geometries, especially those that require deterministic preparation and control of quantized circulation states.
Cite
@article{arxiv.2407.04229,
title = {Thermal Phase Fluctuations in Narrow Superfluid Rings},
author = {Parth Sabharwal and Daniel G. Allman and Pradipta Debnath and Kevin C. Wright},
journal= {arXiv preprint arXiv:2407.04229},
year = {2024}
}
Comments
10 pages, 8 figures