2011/03/31 by Ivar Zapata, I. Zapata, Mathias Albert +2 · 1 citation
Physics and Astronomy · #Bose–Einstein condensate #Cold Atom Physics and Bose-Einstein Condensates #Gravitational wave #Hawking radiation #Phonon #Physics #Quantum Electrodynamics and Casimir Effect #Quantum electrodynamics #Quantum mechanics #Quantum tunnelling #Radiation #Scattering #Strong Light-Matter Interactions #cond-mat.quant-gas #gr-qc
paper · pdf · doi:10.1088/1367-2630/13/6/063048
published as New J.Phys.13:063048,2011 · 20 pages, 9 figures, revised version
arxiv created 2011/05/18 · openalex publication_date 2011/06/29 · arxiv updated 2011/07/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We study double-barrier interfaces separating regions of asymptotically subsonic and supersonic flow of Bose-condensed atoms. These setups contain at least one black hole sonic horizon from which the analogue of Hawking radiation should be generated and emitted against the flow in the subsonic region. Multiple coherent scattering by the double-barrier structure strongly modulates the transmission probability of phonons, rendering it very sensitive to their frequency. As a result, resonant tunneling occurs with high probability within a few narrow frequency intervals. This gives rise to highly non-thermal spectra with sharp peaks. We find that these peaks are mostly associated with decaying resonances and only occasionally with dynamical instabilities. Even at achievable non-zero temperatures, the radiation peaks can be dominated by spontaneous emission, i.e. enhanced zero-point fluctuations, and not, as is often the case in analogue models, by stimulated emission.