| Issue |
EPL
Volume 150, Number 5, June 2025
|
|
|---|---|---|
| Article Number | 56001 | |
| Number of page(s) | 6 | |
| Section | Condensed matter and materials physics | |
| DOI | https://doi.org/10.1209/0295-5075/add760 | |
| Published online | 06 June 2025 | |
Quantum borderlines: Fluctuation energies in ultracold Bose gases(a)
University of Potsdam, Institute of Physics and Astronomy - Karl-Liebknecht-Str. 24/25, 14476 Potsdam, Germany
Received: 1 April 2025
Accepted: 12 May 2025
Ultracold Bose gases are many-body systems with well-defined particle interactions that may serve as models for interacting quantum fields. The impact of virtual excitations is studied in the spatial transition zone created by a soft confinement potential that separates a degenerate ideal gas from a dense quasi-condensate. We compute within Bogoliubov theory the contribution of quasi-particles to the surface energy at zero temperature.
© 2025 The author(s)
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