Vortex to Rotons Transition in Dipolar Bose-Einstein Condensates

Villois, Alberto, Onorato, Miguel and Proment, Davide (2025) Vortex to Rotons Transition in Dipolar Bose-Einstein Condensates. Physical Review Letters, 134 (25). ISSN 0031-9007

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Abstract

Dipolar Bose-Einstein condensates (dBECs) exhibit a plethora of physics phenomena, from supersolidity to the rotonlike minimum in the elementary excitation spectrum. In this work we first demonstrate the existence of axis-symmetric solitary waves in (quasi-)two-dimensional dBECs: these localized excitations are characterized by quantized vortex dipoles that continuously transit to vortex-free density depletions. We then show how the presence of the roton minimum fundamentally alters the fate of such solutions when approaching Landau’s critical speed: when propagating along the polarization direction where the roton minimum occurs, the solitary wave transits into roton excitations rather than into phonons as for standard contact-interaction BECs. This finding suggests that Feynman’s hypothesis, conjectured for 3D superfluid liquid helium regarding the creation of rotons as fading vortex excitations, is valid in the context of 2D dBECs.

Item Type:	Article
Faculty \ School:	Faculty of Science > School of Engineering, Mathematics and Physics
UEA Research Groups:	Faculty of Science > Research Groups > Quantum Matter Faculty of Science > Research Groups > Fluids & Structures Faculty of Science > Research Groups > Centre for Photonics and Quantum Science (former - to 2025)
Related URLs:	http://www.scopus.com/inward/record.url?...
Depositing User:	LivePure Connector
Date Deposited:	09 Feb 2026 15:39
Last Modified:	15 Feb 2026 07:30
URI:	https://ueaeprints.uea.ac.uk/id/eprint/101874
DOI:	10.1103/w9bj-bqq1

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