Study of quantum turbulence by vortex-antivortex dynamics in dipolar BECs
Abstract
We investigate vortex nucleation and dynamics in a dipolar Bose-Einstein condensate stirred by a rotating Gaussian obstacle. Two stirring protocols are compared: continuous stirring with constant amplitude (Case 1), and obstacle removal at t = 15 ms with linear amplitude ramp-down (Case 2). In both cases, a smooth angular velocity ramp (tacc = 3 ms) suppresses spurious phonon excitations. The first vortex pairs exit the obstacle at t ∼ 3 ms, and by t ∼ 8 - $10$ ms the individual vortices and antivortices are fully resolved in the phase maps. Case 1 yields a vortex population that grows up to t ∼ 40 ms and then roughly saturates, while Case 2 yields a population that peaks around t ∼ 15 - $25$ ms and then decreases. Remarkably, both protocols lead to local triangular-like ordering in selected regions of the condensate by t ∼ 50 ms, exhibiting clear dipolar signatures: elliptical distortion and elongated vortex cores along the polarization axis. The mixed vortex-antivortex population remains stable up to $100$ ms with no observable annihilation, indicating that dipolar interactions strongly suppress vortex decay. Kinetic energy decomposition confirms that incompressible (vortex) energy dominates at late times. These results establish a controlled platform for vortex studies in dipolar superfluids and provide benchmarks for future experiments on quantum turbulence with long-range anisotropic interactions.
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BibTeX
@misc{sabari2026study,
title = {{Study of quantum turbulence by vortex-antivortex dynamics in dipolar BECs}},
author = {S. Sabari and Lauro Tomio},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.00857},
eprint = {2610.00857},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.00857},
}
RIS
TY - UNPB
TI - Study of quantum turbulence by vortex-antivortex dynamics in dipolar BECs
AU - S. Sabari
AU - Lauro Tomio
PY - 2026
DA - 2026/10/01
PB - arXiv
DO - 10.48550/arxiv.2610.00857
UR - https://arxiv.org/abs/2610.00857
AB - We investigate vortex nucleation and dynamics in a dipolar Bose-Einstein condensate stirred by a rotating Gaussian obstacle. Two stirring protocols are compared: continuous stirring with constant amplitude (Case 1), and obstacle removal at t = 15 ms with linear amplitude ramp-down (Case 2). In both cases, a smooth angular velocity ramp (t_acc = 3 ms) suppresses spurious phonon excitations. The first vortex pairs exit the obstacle at t ∼ 3 ms, and by t ∼ 8 - $10$ ms the individual vortices and antivortices are fully resolved in the phase maps. Case 1 yields a vortex population that grows up to t ∼ 40 ms and then roughly saturates, while Case 2 yields a population that peaks around t ∼ 15 - $25$ ms and then decreases. Remarkably, both protocols lead to local triangular-like ordering in selected regions of the condensate by t ∼ 50 ms, exhibiting clear dipolar signatures: elliptical distortion and elongated vortex cores along the polarization axis. The mixed vortex-antivortex population remains stable up to $100$ ms with no observable annihilation, indicating that dipolar interactions strongly suppress vortex decay. Kinetic energy decomposition confirms that incompressible (vortex) energy dominates at late times. These results establish a controlled platform for vortex studies in dipolar superfluids and provide benchmarks for future experiments on quantum turbulence with long-range anisotropic interactions.
ER -