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arXiv:2102.01461 (cond-mat)
[Submitted on 2 Feb 2021]

Title:Roton Excitations in an Oblate Dipolar Quantum Gas

Authors:Jan-Niklas Schmidt, Jens Hertkorn, Mingyang Guo, Fabian Böttcher, Matthias Schmidt, Kevin S. H. Ng, Sean D. Graham, Tim Langen, Martin Zwierlein, Tilman Pfau
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Abstract:We observe signatures of radial and angular roton excitations around a droplet crystallization transition in dipolar Bose-Einstein condensates. In situ measurements are used to characterize the density fluctuations near this transition. The static structure factor is extracted and used to identify the radial and angular roton excitations by their characteristic symmetries. These fluctuations peak as a function of interaction strength indicating the crystallization transition of the system. We compare our observations to a theoretically calculated excitation spectrum allowing us to connect the crystallization mechanism with the softening of the angular roton modes.
Comments: 10 pages, 4 + 4 figures
Subjects: Quantum Gases (cond-mat.quant-gas); Atomic Physics (physics.atom-ph)
Cite as: arXiv:2102.01461 [cond-mat.quant-gas]
  (or arXiv:2102.01461v1 [cond-mat.quant-gas] for this version)
  https://doi.org/10.48550/arXiv.2102.01461
Journal reference: Phys. Rev. Lett. 126, 193002 (2021)
Related DOI: https://doi.org/10.1103/PhysRevLett.126.193002

Submission history

From: Jan-Niklas Schmidt [view email]
[v1] Tue, 2 Feb 2021 12:27:08 UTC (1,836 KB)
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