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SUMMARY:Localization of ultracold atoms in a disordered potential at three
  dimensions - Fred Jendrzejewski (Laboratoire Charles Fabry Institut d'Opt
 ique)
DTSTART:20120315T100000Z
DTEND:20120315T110000Z
UID:TALK37014@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:Studying disordered systems is of utmost interest: they lie at
  the heart of many fundamental\nphenomena\, such as Anderson localization 
 in disordered electronic conductors\, superfluidity in\nporous media\, and
  possibly high-Tc superconductivity. In spite of extensive studies\, the\n
 understanding of such systems remains an exciting but formidable task\, ma
 ny issues still being\nunresolved or even controversial.\nAnderson Localiz
 ation is the most emblematic effect of disorder\, describing the appearanc
 e of\nlocalized states due to interference between many scattering amplitu
 des associated with the\ndiffusion of a single quantum particle.In fact\, 
 Anderson Localization depends strongly on the\ndimension. A quantum phase 
 transition around a mobility edge is predicted in three dimensions.\nThis 
 mobility edge corresponds to an energy threshold separating localized from
  extended states.\nDetermining the value of that mobility edge\, for which
  only a scaling law is predicted\, and\nexploring the critical regime arou
 nd it remains a challenge for microscopic theory\, numerical\nsimulations\
 , and experiments.\nIn my talk I will present our recent experimental resu
 lts on Localization. To investigate the open\nquestions about the transiti
 on\, we transposed the successful scheme that allowed for the observation\
 nof one-dimensional Anderson Localization to the three dimensional case. I
 n our experiments\, we\nmonitored the three-dimensional expansion of an in
 itial BEC in the presence of a quasi-isotropic\nlaser speckle disorder and
  observed an atomic cloud composed of two components: a localized and\na d
 iffusive part. These components respectively correspond to energy levels b
 elow and above the\nmobility edge. Altogether\, those experiments allowed 
 us to report the first evidence of threedimensional\nAnderson localization
  of ultracold atoms in the presence of a well-controlled optical\ndisorder
 . This marks a first step towards the precise investigation of the critica
 l behavior around the\nmobility edge with ultracold atoms.
LOCATION:Rutherford building\, Seminar Room B
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