From: Carlo Sirtori <>
Newsgroups: milano.seminari
Subject: 05-10-2009 Polariton atomes in the ultra strong coupling regime
Date: Fri, 25 Sep 2009 13:05:45 +0000 (UTC)


                              Il giorno 05-10-2009
                        alle ore 11:00 in Aula Consiglio

                                 Carlo Sirtori
                        Universite Paris Diderot & CNRS

                        terra' un seminario dal titolo:

              Polariton atomes in the ultra strong coupling regime

The regime of ultra-strong light-matter interaction has been demonstrated using
 0-dimensional cavities coupled with an optical transition between two confined
 states of a semiconductor quantum well. This interaction creates pairs of half
matter and half photon particles with an energy separation that is proportional
  to the coupling strength. We have measured splitting amounting to 48% of the
optical transition, the highest ever measured in a light-matter coupled system.
   The origin of the coupling has been investigated by varying the number of
electrons on the ground state. It is found that such an ultra-strong interaction
    arises from the close-to-unity overlap between the optical mode and the
 electronic wavefunction and a collective contribution due to the high density
                               electronic plasma.

                               Per Informazioni:
                                 Lino Miramonti