Radiative quantum efficiency in an InAs/AlSb intersubband transition

Clement Faugeras (1) , Aaron Wade (2) , Aude Leuliet (1, 3) , Angela Vasanelli (1) , Carlo Sirtori (1) , Georgy Fedorov (2) , Dmitry Smirnov (2) , Roland Teissier (4) , Alexei Baranov (4) , David Barat (4) , Jan Devenson (4)

1 MPQ (UMR_7162) - Laboratoire Matériaux et Phénomènes Quantiques
2 NHMFL - National High Magnetic Field Laboratory
3 Thales Research and Technology [Palaiseau]
4 CEM2 - Centre d'Electronique et de Micro-optoélectronique de Montpellier

The quantum efficiency of an electroluminescent intersubband emitter based on InAs/AlSb has been measured as a function of the magnetic field up to 20T. Two series of oscillations periodic in 1/B are observed, corresponding to the elastic and inelastic scattering of electrons of the upper state of the radiative transitions. Experimental results are accurately reproduced by a calculation of the excited state lifetime as a function of the applied magnetic field. The interpretation of these data gives an exact measure of the relative weight of the scattering mechanisms and allows the extraction of material parameters such as the energy dependent electron effective mass and the optical phonon energy.

Mots clés: quantum cascade laser; magnetophonon; quantum efficiency; inter subband

Domaines: Systèmes mésoscopiques et effet Hall quantique [cond-mat.mes-hall]

Clement Faugeras, Aaron Wade, Aude Leuliet, Angela Vasanelli, Carlo Sirtori, et al.. Radiative quantum efficiency in an InAs/AlSb intersubband transition. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2006, 74 (11), pp.113303. ⟨10.1103/PhysRevB.74.113303⟩. ⟨hal-00087553⟩