Ergoregion instabilities in rotating two-dimensional Bose-Einstein condensates: Perspectives on the stability of quantized vortices
Anno: 2020
Autori: Giacomelli L., Carusotto I.
Affiliazione autori: Univ Trento, INO CNR BEC Ctr, Via Sommar 14, I-38050 Povo, Trento, Italy; Univ Trento, Dipartimento Fis, Via Sommar 14, I-38050 Povo, Trento, Italy.
Abstract: We investigate the stability of vortices in two-dimensional Bose-Einstein condensates. In analogy with rotating space-times and with a careful account of boundary conditions, we show that the dynamical instability of multiply quantized vortices in trapped condensates persists in untrapped, spatially homogeneous geometries and has an ergoregion nature with some modification due to the peculiar dispersion of Bogoliubov sound. Our results open perspectives to the physics of vortices in trapped condensates, where multiply quantized vortices can be stabilized by interference effects and singly charged vortices can become unstable in suitably designed trap potentials. We show how superradiant scattering can be observed also in the short-time dynamics of dynamically unstable systems, providing an alternative point of view on dynamical (in)stability phenomena in spatially finite systems.
Giornale/Rivista: PHYSICAL REVIEW RESEARCH
Volume: 2 (3) Da Pagina: 33139-1 A: 33139-11
Parole chiavi: Superradiant Scattering; VortexDOI: 10.1103/PhysRevResearch.2.033139Citazioni: 23dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2024-12-08Riferimenti tratti da Isi Web of Knowledge: (solo abbonati) Link per visualizzare la scheda su IsiWeb: Clicca quiLink per visualizzare la citazioni su IsiWeb: Clicca qui
