BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Talks.cam//talks.cam.ac.uk//
X-WR-CALNAME:Talks.cam
BEGIN:VEVENT
SUMMARY:Investigating Charge and Vorticity in the Cooper Pair Transistor u
 sing RF Reflectometry (SP Workshop) - Mr Vivek Chidambaram\, University of
  Cambridge\, Semiconductor Physics Group
DTSTART:20151111T141500Z
DTEND:20151111T151500Z
UID:TALK60986@talks.cam.ac.uk
CONTACT:Teri Bartlett
DESCRIPTION:A Cooper pair transistor (CPT) consists of a superconducting i
 sland coupled to leads only by tunnel barriers. Ordinarily\, quasiparticle
 s moving through the island can only exist above the superconducting gap\,
  but entry of superconducting vortices create a sub-gap density of quasipa
 rticle states on the island\, modifying the quasiparticle dynamics. This a
 nd other interactions of these two objects\, for example trapping of a sin
 gle quasiparticle in a vortex\, allows the dynamics of one to be inferred 
 from measurements of the other. CPTs are being fabricated with a view to m
 onitor the quasiparticle tunnelling rates using radio frequency reflectome
 try at zero and low vorticity. RF reflectometry enables rapid read-out of 
 the island quasiparticle states and with sufficient bandwidth may even all
 ow time-domain resolution of single quasiparticle tunnelling events. In th
 is talk I will summarise the theory of quasiparticles and vortices on CPTs
 \, explain the RF reflectometry technique and show the current progress to
 wards fabricating suitable devices for this experiment.
LOCATION:Mott Seminar Room (Mott Building Room 531)\, Cavendish Laboratory
END:VEVENT
END:VCALENDAR