Physics – Condensed Matter – Quantum Gases
Scientific paper
2011-03-15
New J.Phys.13:063048,2011
Physics
Condensed Matter
Quantum Gases
20 pages, 9 figures, revised version
Scientific paper
10.1088/1367-2630/13/6/063048
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 analog 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 to decaying resonances and only occasionally to dynamical instabilities. Even at achievable nonzero temperatures, the radiation peaks can be dominated by the spontaneous emission, i.e. enhanced zero-point fluctuations, and not, as often in analog models, by stimulated emission.
Albert Mathias
Parentani Renaud
Sols Fernando
Zapata Ivar
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