Fransisco José Teran

Publications (3)0 Total impact

• Source

  Available from: Thomas Grange

  Article: Evidence for excitonic polarons in InAs/GaAs quantum dots

  Vanessa Preisler, Thomas Grange, Robson Ferreira, Louis-Anne De Vaulchier, Yves Guldner, Fransisco José Teran, Marek Potemski, Aristide Lemaître
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  ABSTRACT: We investigate the interband transitions in several ensembles of self-assembled InAs/GaAs quantum dots by using photoluminescence excitation spectroscopy under strong magnetic field. Well defined resonances are observed in the spectra. A strong anticrossing between two transitions is observed in all samples, which cannot be accounted for by a purely excitonic model. The coupling between the mixed exciton-LO phonon states is calculated using the Fr\"{o}hlich Hamiltonian. The excitonic polaron energies as well as the oscillator strengths of the interband transitions are determined. An anticrossing is predicted when two exciton-LO phonon states have close enough energies with phonon occupations which differ by one. A good agreement is found between the calculations and the experimental data evidencing the existence of excitonic polarons.
  09/2006;
• Article: Magneto-optical interband transitions in semiconductor quantum dots: evidence for excitonic polarons

  Vanessa Preisler, Thomas Grange, Robson Ferreira, Yves Guldner, Louis-Anne De Vaulchier, Fransisco José Teran, Marek Potemski, Aristide Lemaître
  AIP Conf. Proc. Vol. (893).
• Article: Investigation of interband optical transitions by resonant magneto-photoluminescence in InAs/GaAs quantum dots

  Vanessa Preisler, Thomas Grange, Robson Ferreira, Louis-Anne De Vaulchier, Yves Guldner, Fransisco José Teran, Marek Potemski, Aristide Lemaître
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  ABSTRACT: Resonant photoluminescence experiments performed on self-assembled InAs/GaAs quantum dots under strong magnetic field up to 28 T give rise to an accurate determination of the interband magneto-optical transitions. As this technique circumvents the homogeneous broadening of the transitions due to the size and composition fluctuations of the dots, the experimental spectra display well-defined peaks. A good agreement is found between the experimental data and calculations using an effective mass model including the coupling between the mixed exciton-LO phonon states. Transitions involving excitonic polarons are clearly identified. Moreover, a light-hole to conduction transition is also evidenced in agreement with previous theoritical predictions.