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SUMMARY:Cold and dense dipolar exciton quantum fluids in two dimensions. -
  Dr. Ronen Rapaport\, Bell Labs
DTSTART:20070214T141500Z
DTEND:20070214T151500Z
UID:TALK6655@talks.cam.ac.uk
CONTACT:Paul Eastham
DESCRIPTION:Excitons\, electron-hole coulomb bound states insemiconductors
 \, are quasi-particle excitations that are analogous to boson-like atoms i
 n many ways. New methods now allow to create and to confine such particles
  in ultra-clean coupled two-dimensional layers\, with extremely long lifet
 imes. With the right design\, those excitons can become dipolar\, with all
  the electric-dipoles aligned. Such a configuration forms a unique system 
 of interacting bosons in two-dimensions. At the extreme density and temper
 ature limits\, collective quantum effects are expected and the system shou
 ld undergo quantum phase transitions to new collective phases in two dimen
 sions. Moreover\, under such conditions\, the (hydro-) dynamics of the exc
 iton fluid is uniquely determined by the intricate interplay of interactio
 n and quantum statistics\, opening up opportunities for new design and stu
 dy of quantum fluid devices. In this talk I will review our research progr
 ess and the remaining challenges in this growing field\, and describe our 
 efforts to develop techniques for manipulating\, trapping and cooling dens
 e exciton fluids and to observe collective quantum effects. I will also do
  my best to portray a picture of what we now know and what we do not yet k
 now of such systems and of what lies ahead in our exciton fluidics researc
 h.
LOCATION:Small Lecture Theatre\, Cavendish Laboratory
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