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Influence of interface roughness in quantum cascade lasers

Krivas, K. A.; Winge, David LU ; Franckie, Martin LU and Wacker, Andreas LU (2015) In Journal of Applied Physics 118(11).
Abstract
We use a numerical model based on non-equilibrium Green's functions to investigate the influence of interface roughness (IFR) scattering in terahertz quantum cascade lasers. We confirm that IFR is an important phenomenon that affects both current and gain. The simulations indicate that IFR causes a leakage current that transfers electrons from the upper to the lower laser state. In certain cases, this current can greatly reduce gain. In addition, individual interfaces and their impact on the renormalized single particle energies are studied and shown to give both blue-and red-shifts of the gain spectrum. (C) 2015 AIP Publishing LLC.
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Applied Physics
volume
118
issue
11
publisher
American Institute of Physics
external identifiers
  • wos:000361843300024
  • scopus:84942015425
DOI
10.1063/1.4930572
language
English
LU publication?
yes
id
04f574c4-0898-420e-8c58-c242b3d1620c (old id 8062355)
date added to LUP
2015-10-21 09:30:22
date last changed
2017-05-28 03:24:37
@article{04f574c4-0898-420e-8c58-c242b3d1620c,
  abstract     = {We use a numerical model based on non-equilibrium Green's functions to investigate the influence of interface roughness (IFR) scattering in terahertz quantum cascade lasers. We confirm that IFR is an important phenomenon that affects both current and gain. The simulations indicate that IFR causes a leakage current that transfers electrons from the upper to the lower laser state. In certain cases, this current can greatly reduce gain. In addition, individual interfaces and their impact on the renormalized single particle energies are studied and shown to give both blue-and red-shifts of the gain spectrum. (C) 2015 AIP Publishing LLC.},
  articleno    = {114501},
  author       = {Krivas, K. A. and Winge, David and Franckie, Martin and Wacker, Andreas},
  language     = {eng},
  number       = {11},
  publisher    = {American Institute of Physics},
  series       = {Journal of Applied Physics},
  title        = {Influence of interface roughness in quantum cascade lasers},
  url          = {http://dx.doi.org/10.1063/1.4930572},
  volume       = {118},
  year         = {2015},
}