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Rotation quenches in trapped bosonic systems.
Rhombik Roy1,2, Sunayana Dutta3,4, Ofir E Alon3,4
1Department of Physics, University of Haifa, 3498838, Haifa, Israel. rroy@campus.haifa.ac.il.
Scientific Reports
|July 27, 2025
Summary
Strongly rotating bosons in asymmetric traps show complex dynamics when rotation speed changes. These findings reveal insights into trapped Bose-Einstein condensates and vortex behavior.
Area of Science:
- Atomic, Molecular, and Optical Physics
- Condensed Matter Physics
- Quantum Dynamics
Background:
- Strongly rotating bosons in asymmetric potentials exhibit a split density distribution.
- The out-of-equilibrium dynamics of this split structure under changing rotation are not well understood.
Purpose of the Study:
- Investigate the out-of-equilibrium dynamics of trapped bosons by abruptly changing rotation frequency.
- Explore the impact of rotation quenches on both symmetric and asymmetric anharmonic potentials.
- Analyze the role of angular momentum conservation and vortex formation in these dynamics.
Main Methods:
- Simulations of trapped Bose-Einstein condensates under rotation quenches.
- Analysis of both mean-field condensed and many-body fragmented systems.
- Examination of density distributions, angular momentum, and vortex dynamics.
Main Results:
- Rotation quenches do not affect density in symmetric traps due to angular momentum conservation.
- Asymmetric traps show complex dynamics, allowing angular momentum injection or extraction.
- Similarities and divergences in dynamics between condensed and fragmented systems observed for small and large quenches, respectively.
- Vortex formation and its impact on angular momentum dynamics were analyzed.
Conclusions:
- Rotation quenches in asymmetric traps lead to intricate dynamics not present in symmetric traps.
- The study provides insights into the behavior of trapped interacting bosons under varying rotational conditions.
- Findings highlight the importance of angular momentum conservation in determining dynamical responses.
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