BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-2678
DTSTART:20120709T190000Z
DURATION:PT1H0M0S
DTSTAMP:20260315T020006Z
LAST-MODIFIED:20120711T181752Z
LOCATION:5310 Chamberlin
SUMMARY:Single impurity atoms immersed in an ultracold gas\, Atomic Ph
 ysics Seminar\, Nicolas Spethmann\, Institute for Applied Physics\, Un
 iversity of Bonn
DESCRIPTION:Ultracold gases doped with single impurity atoms are promi
 sing hybrid systems that pave the way for the realization of intriguin
 g scenarios\, such as studying polaron physics\, forming local\, coher
 ent probes for a many-body system and coherent cooling of individual n
 eutral atoms containing quantum information.<br>
\n<br>
\nI will prese
 nt our experiments of immersing single and few Cs atoms into an ultrac
 old\, thermal Rb cloud. We observe the sympathetic cooling of the impu
 rity atoms\, where the temperature is limited only by the temperature 
 of the Rb gas. The thermalization dynamics can be understood in terms 
 of the well-known elastic interspecies <i>s</i>-wave scattering length
 . Inelastic three-body collisions are studied with atomic resolution\,
  allowing to unambiguously assign losses to Rb-Rb-Cs three-body recomb
 ination and permitting a precise determination of the loss coefficient
 \, which is not directly possible in balanced mixtures. In all experim
 ents\, the ultracold Rb gas remains unaffected by the interaction with
  the Cs impurity atoms\, demonstrating the feasibility of using single
  atoms as probes for a many-body system. The obtained results for the 
 interaction properties of the two sub-systems are a significant step t
 oward a coherently interacting hybrid system of individually controlla
 ble impurities in a quantum many-body system.<br>
\n<br>
URL:https://www.physics.wisc.edu/events/?id=2678
END:VEVENT
END:VCALENDAR