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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:0
UID:UW-Physics-Event-4110
DTSTART:20160330T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T113719Z
LAST-MODIFIED:20160328T173429Z
LOCATION:5310 Chamberlin Hall
SUMMARY:Cooling and stabilization of levitated graphite nanoplatelets\
 , R. G. Herb Condensed Matter Seminar\, Pavel Nagornykh\, University o
 f Maryland
DESCRIPTION:The discovery of graphene in 2004 led to a new spike of in
 terest in 2D materials\, with many new ones uncovered and studied in t
 he last ten years. At the same time\, it became apparent how important
  it is to minimize interaction between the 2D sample and the environme
 nt and\, ideally\, to separate them completely. One of the ways to sol
 ve this problem was proposed in 2010 by Bruce Kane in experiment\, whe
 re the graphite microparticles were levitated in a quadrupole ion trap
 . <br>
\n <br>
\nIn this talk\, I'm going to discuss our progress on l
 earning how to control these levitated particles in high vacuum condit
 ions\, where a feedback cooling is required. I will present our result
 s\, which include cooling down the translational motion of the particl
 es down to 20K and study of the effect of stray electric fields on the
  efficiency of the feedback cooling. Finally\, I'm going to talk about
  our most recent work on locking nanoplatelets' rotation to an externa
 l RF fields\, which allows us to tune their spinning frequency as well
  as the spinning axis orientation. This shows that we are close to hav
 ing full control over both translational and rotational degrees of fre
 edom for the levitated graphite flakes\, which is a crucial condition 
 for further research on levitated 2D materials.
URL:https://www.physics.wisc.edu/events/?id=4110
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