Comparative analysis of quantum cascade laser modeling based on density matrices and non-equilibrium Green's functions
- Mathematical Physics, Lund University, Box 118, 22100 Lund (Sweden)
- ETH Institute for Quantum Electronics, ETH-Zürich, 8093 Zürich (Switzerland)
- III-V Lab, 1 Avenue Augustin Fresnel, 91767 Palaiseau (France)
- Fraunhofer-Institut für Angewandte Festkörperphysik, Tullastrasse 72, 79108 Freiburg (Germany)
We study the operation of an 8.5 μm 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.
- OSTI ID:
- 22310846
- Journal Information:
- Applied Physics Letters, Vol. 105, Issue 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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