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    STUDIA PHYSICA - Issue no. 2 / 2004  
         
  Article:   PLENARY LECTURES AND ORAL PRESENTATIONS - ELECTRONIC STRUCTURE AND SYMMETRY CHARACTERIZATION OF II-VI SEMICONDUCTOR QUANTUM DOTS EMBEDDED.

Authors:  M. IVANDA, C. DEM, K BABOCSI, V KULAKOVSKII, M. SCHMITT, WOLFGANG KIEFER. 		 
       
         
  Abstract:  By means of polarized low wavenumber Raman (LWR) spectroscopy the acoustic vibration modes in commercially available CdSxSe1-x nanocrystals embedded in glass matrix were investigated. The QD’s size was determined using the inverse proportionality between the wavenumber of acoustic modes and the QD’s diameter. Strong exciton-exciton coupling and spin dephasing effects in confined systems were observed by analyzing the polarization properties of femtosecond four wave mixing (FWM) signals. The appearance of strong FWM signals in forbidden polarization geometries is a proof of the formation of biexcitons in QDs and of the splitting of the lowest lying exciton state  yielding direct information about the QD’s asymmetry.  
         
     
         
         
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