BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-4527
DTSTART:20170324T190000Z
DTEND:20170324T200000Z
DTSTAMP:20240328T201959Z
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
\nmake them attractive systems for the studies
of ordered phases of interacting
\nmany-body systems and simulati
ng quantum phase transitions.
\n
\nSeveral conceptually differ
ent approaches have been explored\, both theoretically
\nand expe
rimentally\, for the preparation of crystalline order of Rydberg excit
ations
\nin spatially-extended ensembles of cold atoms. These inc
lude direct (near-)resonant
\nlaser excitation of strongly-intera
cting Rydberg states in a two-dimensional lattice
\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.
\nWe show\, however\, that taking into accou
nt realistic relaxation processes affecting
\nthe atoms severely
complicates the prospects of attaining sizable crystals of Rydberg
\nexcitations in laser-driven atomic media. Our simulations well rep
roduce the
\nexperimental observations of spatial ordering of Ryd
berg excitations in driven
\ndissipative lattice gases\, as well
as highly sub-Poissonian probability distribution
\nof the excita
tion number. We find that the excitations essentially form liquid rath
er
\nthan crystal phases with long-range order.
URL:https://www.physics.wisc.edu/events/?id=4527
END:VEVENT
END:VCALENDAR