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The blue light emanates from the location of the sonic black hole.  This light creates the sonic horizon.

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Steinhauer Atomic Physics Laboratory

Our research focuses on important analogies between ultracold atoms and other areas of physics.  Currently, we are focusing on black hole analogues.  We recently made the first observation of thermal, quantum Hawking radiation in any system.  This was the result of a 5-year effort, in which we created a sonic black hole, and developed the techniques required to carefully study minute distributions of phonons in a Bose-Einstein condensate.  This research path also led to the first quantitative observation of the bunching phenomenon in a Bose-Einstein condensate.

Our Hawking radiation research is based on our pioneering ultra-high resolution imaging system.  This system was originally developed for our study of the Josephson effect in a Bose-Einstein condensate.  After a 6-year effort, we made the first observation of the AC Josephson effect in a Bose-Einstein condensate, and the first observation of the DC Josephson effect in any system other than superconductors.  These observations were in close analogy with the superconducting case.

The ultra-high resolution imaging system also allowed us to make the first in situ study of an optical lattice with single-site resolution and tunneling between sites.

Finally, we are always interested in scientific novelties, such as an object which oscillates periodically from one form to another.  Specifically, we discovered a vortex ring which periodically transforms into a soliton and then back into a vortex ring.  This breaks the paradigm of the one-way decay of a soliton into a vortex ring.