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UID:UW-Physics-Event-4527
DTSTART:20170324T190000Z
DTEND:20170324T200000Z
DTSTAMP:20260419T043054Z
LAST-MODIFIED:20170324T130418Z
LOCATION:5310 Chamberlin Hall
SUMMARY:Rydberg crystals in a cold lattice gas\, Atomic Physics Semina
 r\, Prof. David Petrosyan\, Institute of Electronic Structure & Laser 
 (IESL)  Foundation for Research and Technology - Hellas (FORTH)  Herak
 lion\, Crete\, GREECE
DESCRIPTION:Strong\, long-range interactions between atoms in high-lyi
 ng Rydberg states <br>
\nmake them attractive systems for the studies 
 of ordered phases of interacting <br>
\nmany-body systems and simulati
 ng quantum phase transitions.<br>
\n<br>
\nSeveral conceptually differ
 ent approaches have been explored\, both theoretically <br>
\nand expe
 rimentally\, for the preparation of crystalline order of Rydberg excit
 ations <br>
\nin spatially-extended ensembles of cold atoms. These inc
 lude direct (near-)resonant <br>
\nlaser excitation of strongly-intera
 cting Rydberg states in a two-dimensional lattice <br>
\ngas\, and adi
 abatic preparation of crystalline phases of Rydberg excitations in a <
 br>
\none-dimensional optical lattice by adiabatic frequency sweep of 
 the excitation laser.<br>
\nWe show\, however\, that taking into accou
 nt realistic relaxation processes affecting <br>
\nthe atoms severely 
 complicates the prospects of attaining sizable crystals of Rydberg <br
 >
\nexcitations in laser-driven atomic media. Our simulations well rep
 roduce the <br>
\nexperimental observations of spatial ordering of Ryd
 berg excitations in driven <br>
\ndissipative lattice gases\, as well 
 as highly sub-Poissonian probability distribution <br>
\nof the excita
 tion number. We find that the excitations essentially form liquid rath
 er <br>
\nthan crystal phases with long-range order.
URL:https://www.physics.wisc.edu/events/?id=4527
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