Roton Excitations in an Oblate Dipolar Quantum Gas

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.

arXiv comment10 pages, 4 + 4 figures

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• Pattern Formation in Quantum Ferrofluids: from Supersolids to Superglasses
• Observation of vortices and vortex stripes in a dipolar Bose-Einstein condensate
• Crystallization of Bosonic Quantum Hall States
• Self-bound dipolar droplets and supersolids in molecular Bose-Einstein condensates
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• Heating a dipolar quantum fluid into a solid
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• Maintaining supersolidity in one and two dimensions
• Topological quantum critical points in the extended Bose-Hubbard model
• Non-Local Phononic Crystals for Dispersion Customization and Undulation-point Dynamics
• Alternating-domain supersolids in binary dipolar condensates
• Supersolidity and crystallization of a dipolar Bose gas in an infinite tube
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• Excitations of a binary dipolar supersolid
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• Quantum-geometric perspective on spin-orbit-coupled Bose superfluids
• Striped Ultradilute Liquid of Dipolar Bosons in Two Dimensions
• Induced supersolidity and hypersonic flow of a dipolar Bose-Einstein Condensate in a rotating bubble trap
• Exploring the Berezinskii-Kosterlitz-Thouless Transition in a Two-dimensional Dipolar Bose Gas
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• Anomalous dispersion of shear waves in dipolar supersolids
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