Comparative analysis of quantum cascade laser modeling based on density matrices and non-equilibrium Green's functions
Franckie, Martin; Wolf, J. M.; Trinite, V.; Liverini, V., et al. (2014). Comparative analysis of quantum cascade laser modeling based on density matrices and non-equilibrium Green's functions. Applied Physics Letters, 105, (10)
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Published
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English
Authors:
Franckie, Martin
;
Wolf, J. M.
;
Trinite, V.
;
Liverini, V.
, et al.
Department:
Mathematical Physics
NanoLund: Centre for Nanoscience
Project:
Modeling Quantum Cascade Lasers: the Challenge of Infra-Red Devices
Abstract:
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.
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