Comparative analysis of quantum cascade laser modeling based on density matrices and non-equilibrium Green's functions

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We study the operation of an 8.5 mu m quantum cascade laser based on GaInAs/AlInAs lattice matched to InP using three different simulation models based on density matrix (DM) and non-equilibrium Green's function (NEGF) formulations. The latter advanced scheme serves as a validation for the simpler DM schemes and, at the same time, provides additional insight, such as the temperatures of the sub-band carrier distributions. We find that for the particular quantum cascade laser studied here, the behavior is well described by simple quantum mechanical estimates based on Fermi's golden rule. As a consequence, the DM model, which includes second order currents, agrees well with the NEGF results. Both these simulations are in accordance with previously reported data and a second regrown device. (C) 2014 AIP Publishing LLC.


  • Martin Franckie
  • J. M. Wolf
  • V. Trinite
  • V. Liverini
  • J. Faist
  • G. Maisons
  • M. Carras
  • R. Aidam
  • R. Ostendorf
  • Andreas Wacker
External organisations
  • ETH Zürich
  • G.I.E III-V Lab, France
  • Fraunhofer Institute for Applied Solid State Physics
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Condensed Matter Physics
Original languageEnglish
Article number103106
JournalApplied Physics Letters
Issue number10
Publication statusPublished - 2014
Publication categoryResearch

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Martin Franckie


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