From harmonic to sound-like oscillations in a quantum gas confined in a gravity compensated shell trap
Abstract
We study the center of mass oscillations of a quantum gas in a shell shaped trap in the presence of a vertical force opposed to gravity. The measured harmonic frequency at the bottom of the shell is compared with an analytical formula for the trap potential including corrections beyond the rotating wave approximation. When gravity is partially compensated, a quartic correction to the harmonic motion has to be included due to the shell curvature. As gravity is nearly canceled, the quantum gas occupies a large fraction of the lower hemisphere. Driving the center of mass induces internal excitations in the quantum gas, whose time evolution is governed by the presence of sound waves. Relaxation processes induce a strong damping of the center of mass oscillation in this limit.
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BibTeX
@misc{cassus2026from,
title = {{From harmonic to sound-like oscillations in a quantum gas confined in a gravity compensated shell trap}},
author = {Matthieu Cassus and Rishabh Sharma and Maxime Pesche and Laurent Longchambon and Thomas Badr and Romain Dubessy and Hélène Perrin},
howpublished = {HAL},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.24738},
eprint = {2609.24738},
archivePrefix = {arXiv},
url = {https://hal.science/hal-05755717v1},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - From harmonic to sound-like oscillations in a quantum gas confined in a gravity compensated shell trap
AU - Matthieu Cassus
AU - Rishabh Sharma
AU - Maxime Pesche
AU - Laurent Longchambon
AU - Thomas Badr
AU - Romain Dubessy
AU - Hélène Perrin
PY - 2026
DA - 2026/09/19
PB - HAL
DO - 10.48550/arxiv.2609.24738
UR - https://hal.science/hal-05755717v1
AB - We study the center of mass oscillations of a quantum gas in a shell shaped trap in the presence of a vertical force opposed to gravity. The measured harmonic frequency at the bottom of the shell is compared with an analytical formula for the trap potential including corrections beyond the rotating wave approximation. When gravity is partially compensated, a quartic correction to the harmonic motion has to be included due to the shell curvature. As gravity is nearly canceled, the quantum gas occupies a large fraction of the lower hemisphere. Driving the center of mass induces internal excitations in the quantum gas, whose time evolution is governed by the presence of sound waves. Relaxation processes induce a strong damping of the center of mass oscillation in this limit.
ER -