R. G. Herb Condensed Matter Seminars

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Events During the Week of March 27th through April 3rd, 2016

Monday, March 28th, 2016

No events scheduled

Tuesday, March 29th, 2016

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Wednesday, March 30th, 2016

Cooling and stabilization of levitated graphite nanoplatelets
Time: 10:00 am
Place: 5310 Chamberlin Hall
Speaker: Pavel Nagornykh, University of Maryland
Abstract: The discovery of graphene in 2004 led to a new spike of interest in 2D materials, with many new ones uncovered and studied in the last ten years. At the same time, it became apparent how important it is to minimize interaction between the 2D sample and the environment and, ideally, to separate them completely. One of the ways to solve this problem was proposed in 2010 by Bruce Kane in experiment, where the graphite microparticles were levitated in a quadrupole ion trap.

In this talk, I'm going to discuss our progress on learning how to control these levitated particles in high vacuum conditions, where a feedback cooling is required. I will present our results, which include cooling down the translational motion of the particles 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 external RF fields, which allows us to tune their spinning frequency as well as the spinning axis orientation. This shows that we are close to having full control over both translational and rotational degrees of freedom for the levitated graphite flakes, which is a crucial condition for further research on levitated 2D materials.
Host: McDermott
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Thursday, March 31st, 2016

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Friday, April 1st, 2016

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