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SUMMARY:Stron Interactions in Non-equilibrium systems - Dr Hakan Tureci (S
 wiss Federal Institute of Technology\, Zurich)
DTSTART:20080128T153000Z
DTEND:20080128T163000Z
UID:TALK9963@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:With the recent advances in nanofabrication capabilities\, new
  micro- and nano-laser systems have emerged\, such as microcavity lasers\,
  random lasers and polaritonic lasers. These systems are characterized in 
 certain operational regimes by complex modal structure and strong mode-mod
 e interactions\, highlighting the inadequacies of current theory. In this 
 talk\, I will discuss theoretical tools that we have developed to treat st
 rong mode-mode interactions in non-equilibrium systems by accessing direct
 ly the steady state. After touching on some of the controversy in the past
  decade on lasing in weakly disordered lasing media ("diffusive random las
 ers")\, I will show that in these systems\, lasing dynamics is dominated b
 y strong non-linear interactions between modes. Minute spatial fluctuation
 s in the pump power are found to lead to large fluctuations in the steady-
 state lasing intensities\, while the lasing frequencies remain surprisingl
 y immune\, in agreement with recent experiments.\n\n \n\n
LOCATION:HEP Seminar Room (980) Rutherford Building\, Cavendish Laboratory
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