Volume 133, Number 2, January 2021
|Number of page(s)||7|
|Published online||22 March 2021|
On the role of interactions in trans-sonically flowing atomic condensates(a)
1 Dipartimento di Fisica “Giuseppe Occhialini”, Università di Milano- Bicocca - Piazza della Scienza 3, I-20126 Milano, Italy
2 INFN, Sezione di Milano- Bicocca - Piazza della Scienza 3, I-20126 Milano, Italy
3 INO- CNR BEC Center and Dipartimento di Fisica, Università di Trento - I-38123 Povo, Italy
4 Dipartimento di Scienza e Alta Tecnologia, Università degli Studi dell'Insubria - Via Valleggio 11, I-22100 Como, Italy
Received: 14 October 2020
Accepted: 11 February 2021
We provide a joint numerical-analytical study of the physics of a flowing atomic Bose-Einstein condensate in the combined presence of an external trap and a step potential which accelerates the atoms out of the condensate creating a pair of neighbouring black- and white-hole horizons. In particular, we focus on the rapidly growing density modulation pattern that appears in the supersonic region, an experimentally observed feature that was related to black-hole lasing phenomena. A direct assessment of the role of interactions in this process suggests an interpretation of the experimental data in terms of linear interference of atomic waves rather than collective effects. Our conclusions are further supported by an analytical solution of the Schrödinger equation in terms of Airy wave functions.
PACS: 03.75.Kk – Dynamic properties of condensates; collective and hydrodynamic excitations, superfluid flow / 04.62.+v – Quantum fields in curved spacetime / 04.70.Dy – Quantum aspects of black holes, evaporation, thermodynamics
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