Quantum Institute: Visitor Schedule

The Quantum Lunch is regularly held on Thursdays in the Theoretical Division Conference Room, TA-3, Building 123, Room 121.

The organizing committee includes Malcolm Boshier (P-21), Adolfo del Campo (T-4 & CNLS), Michael Di Rosa (C-PCS), Armin Rahmanisisan (T-4 & CNLS), Changhyun Ryu (P-21) , Nikolai Sinitsyn (T-4), Rolando Somma (T-4), Christopher Ticknor (T-1), and Wojciech Zurek (T-4).

For more information, or to nominate a speaker, contact Adolfo del Campo.

To add your name to the Quantum Lunch email list, contact Ellie Vigil.

Thursday June 12, 2014
12:30 PM - 2:00 PM

Speaker: Fernando Sols (Universidad Complutense de Madrid (Spain))

Technical Host: Adolfo del Campo

TOPIC: Hawking radiation from sonic black holes in flowing atom condensates

Abstract
We study the stationary transport through a double-barrier interface separating regions of asymptotically subsonic and supersonic flow of Bose-condensed atoms. Multiple coherent scattering by the double-barrier gives rise to highly non-thermal Hawking radiation displaying sharp peaks which 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 [1]. We also investigate the possibility of using the violation of classical Cauchy-Schwarz inequalities by the outgoing radiation beams as a conclusive signature of spontaneous Hawking radiation [2]. We find that the violation can be large in resonant boson structures. Finally, we perform numerical simulations to identify the best protocols to create quasi-stationary black-hole configurations in realistic setups.

[1] I. Zapata, M. Albert, R. Parentani, F. Sols. Resonant Hawking radiation in Bose-Einstein condensates. New J. Phys. 13, 063048 (2011).
[2] J. R. M. de Nova, F. Sols, I. Zapata. Violation of Cauchy-Schwarz inequalities by spontaneous Hawking radiation in resonant boson structures. Phys. Rev. A 89, 043808 (2014).