Density-matrix theory of the optical dynamics and transport in quantum cascade structures: The role of coherence
Weber, Carsten LU ; Wacker, Andreas LU
and Knorr, A.
(2009)
In Physical Review B (Condensed Matter and Materials Physics)
79(16).
- Abstract
- The impact of coherence on the nonlinear optical response and stationary transport is studied in quantum cascade laser structures. Nonequilibrium effects such as the pump-probe signals, the spatiotemporally resolved electron density evolution, and the subband population dynamics (Rabi flopping) as well as the stationary current characteristics are investigated within a microscopic density-matrix approach. Focusing on the stationary current and the recently observed gain oscillations, it is found that the inclusion of coherence leads to observable coherent effects in opposite parameter regimes regarding the relation between the level broadening and the tunnel coupling across the main injection barrier. This shows that coherence plays a... (More)
- The impact of coherence on the nonlinear optical response and stationary transport is studied in quantum cascade laser structures. Nonequilibrium effects such as the pump-probe signals, the spatiotemporally resolved electron density evolution, and the subband population dynamics (Rabi flopping) as well as the stationary current characteristics are investigated within a microscopic density-matrix approach. Focusing on the stationary current and the recently observed gain oscillations, it is found that the inclusion of coherence leads to observable coherent effects in opposite parameter regimes regarding the relation between the level broadening and the tunnel coupling across the main injection barrier. This shows that coherence plays a complementary role in stationary transport and nonlinear optical dynamics in the sense that it leads to measurable effects in opposite regimes. For this reason, a fully coherent consideration of such nonequilibrium structures is necessary to describe the combined optical and transport properties. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1425855
- author
- Weber, Carsten
LU
; Wacker, Andreas
LU
and Knorr, A.
- organization
- publishing date
- 2009
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- quantum cascade lasers, nonlinear optics, optical pumping
- in
- Physical Review B (Condensed Matter and Materials Physics)
- volume
- 79
- issue
- 16
- article number
- 165322
- publisher
- American Physical Society
- external identifiers
-
- wos:000265945200077
- scopus:66749146766
- ISSN
- 1098-0121
- DOI
- 10.1103/PhysRevB.79.165322
- language
- English
- LU publication?
- yes
- id
- ae66f4a6-ce41-4d7d-889f-08e54f160b7b (old id 1425855)
- date added to LUP
- 2016-04-01 13:56:01
- date last changed
- 2022-01-27 21:54:54
@article{ae66f4a6-ce41-4d7d-889f-08e54f160b7b,
abstract = {{The impact of coherence on the nonlinear optical response and stationary transport is studied in quantum cascade laser structures. Nonequilibrium effects such as the pump-probe signals, the spatiotemporally resolved electron density evolution, and the subband population dynamics (Rabi flopping) as well as the stationary current characteristics are investigated within a microscopic density-matrix approach. Focusing on the stationary current and the recently observed gain oscillations, it is found that the inclusion of coherence leads to observable coherent effects in opposite parameter regimes regarding the relation between the level broadening and the tunnel coupling across the main injection barrier. This shows that coherence plays a complementary role in stationary transport and nonlinear optical dynamics in the sense that it leads to measurable effects in opposite regimes. For this reason, a fully coherent consideration of such nonequilibrium structures is necessary to describe the combined optical and transport properties.}},
author = {{Weber, Carsten and Wacker, Andreas and Knorr, A.}},
issn = {{1098-0121}},
keywords = {{quantum cascade lasers; nonlinear optics; optical pumping}},
language = {{eng}},
number = {{16}},
publisher = {{American Physical Society}},
series = {{Physical Review B (Condensed Matter and Materials Physics)}},
title = {{Density-matrix theory of the optical dynamics and transport in quantum cascade structures: The role of coherence}},
url = {{https://lup.lub.lu.se/search/files/3674063/1502249.pdf}},
doi = {{10.1103/PhysRevB.79.165322}},
volume = {{79}},
year = {{2009}},
}