English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We measure the power spectrum of the density distribution of a freelyexpanding 2D degenerate Bose gas, where irregular density modulations graduallydevelop due to the initial phase fluctuations in the sample. The spectrum hasan oscillatory shape, where the peak positions are found to be independent oftemperature and show scaling behavior in the course of expansion. The relativeintensity of phase fluctuations is estimated from the normalized spectral peakstrength and observed to decrease at lower temperatures, confirming the thermalnature of the phase fluctuations. We investigate the relaxation dynamics ofnonequilibrium states using the power spectrum. Free vortices are observed withring-shaped density ripples in a perturbed sample after a long relaxation time.

Probing Phase Fluctuations in a 2D Degenerate Bose Gas by Free Expansion