Superradiant phononic emission from the analog spin ergoregion in a two-component Bose–Einstein condensate

Year: 2023

Authors: Berti A., Giacomelli L., Carusotto I.

Autors Affiliation: Univ Trento, Pitaevskii BEC Ctr, CNR INO & Dipartimento Fis, I-38123 Trento, Italy; Univ Paris Cite, CNRS, Materiaux & Phenomenes Quant, F-75013 Paris, France.

Abstract: We make use of an analog gravity perspective to obtain a physical understanding of hydrodynamic instabilities stemming from the presence of quantized vortices in two-component atomic condensates and of their relation to ergoregion instabilities of rotating massive objects in gravitation. In addition to the localized instabilities related to vortex splitting, configurations displaying dynamically unstable modes that extend well outside the vortex core are found. In this case, the superradiant scattering process involves phonon emission into the much wider ergoregion of spin modes, so the physics most closely resembles the one of rotating massive objects. Our results confirm the potential of two-component condensates as analog models of rotating space-times in different regimes of gravitational interest.

Journal/Review: COMPTES RENDUS PHYSIQUE

Volume: 24      Pages from:   to:

More Information: A. B. aknowledges financial support from Q@TN, the joint lab between University of Trento, FBK-Fondazione Bruno Kessler, INFN- National Institute for Nuclear Physics and CNR- National Research Council. I. C. acknowledges financial support from the European Union H2020-FETFLAG-2018-2020 project “PhoQuS” (n.820392), from the Provincia Autonoma di Trento, and from the Q@TN initiative. I. C. warmly congratulates Jean for the CNRS Gold Medal and wishes express him all his gratitude for more than two decades of collaboration and friendship. I still remember when, as an undergraduate student, I got fond of Jean’s articles on laser cooling and I was looking forward to meeting him in person. So, I could not miss the chance of spending a semester working in his group as a visiting student. This period, together with the following Post-Doc, were a real turning point of my own career, where I could give a dramatic boost to my scientific expertise and lay the grounds of many research lines that I am still now carrying out: the choice of the research project that he and Yvan proposed for my stay in Paris could not have been more far-sighted! Since then, I have always counted on Jean as a source of scientific inspiration and a continuous generous support for my research activity. It is therefore a great honor for us to include this article in the “Gold Medal” research collection dedicated to him.
KeyWords: Analog; Dynamics
DOI: 10.5802/crphys.145

Citations: 1
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