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Title: Influence of screening on longitudinal-optical phonon scattering in quantum cascade lasers

We theoretically investigate the influence of screening on electron-longitudinal optical phonon scattering in quantum cascade lasers. By employing ensemble Monte Carlo simulations, an advanced screening model based on the random-phase approximation is compared to the more elementary Thomas-Fermi and Debye models. For mid-infrared structures, and to a lesser extent also for terahertz designs, the inclusion of screening is shown to affect the simulated current and optical output power. Furthermore, it is demonstrated that by using the electron temperature rather than the lattice temperature, the Debye model can be significantly improved.
Authors:
;  [1]
  1. Institute for Nanoelectronics, Technical University of Munich (TUM), D-80333 Munich (Germany)
Publication Date:
OSTI Identifier:
22494921
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 119; Journal Issue: 3; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COMPUTERIZED SIMULATION; ELECTRON TEMPERATURE; INCLUSIONS; LASERS; MONTE CARLO METHOD; PHONONS; RANDOM PHASE APPROXIMATION; SCATTERING; THOMAS-FERMI MODEL