Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2008-11-23
Phys. Rev. B 79, 165322 (2009)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
14 pages, 11 figures; final version
Scientific paper
10.1103/PhysRevB.79.165322
The impact of coherence on the nonlinear optical response and stationary transport is studied in quantum cascade laser structures. Nonequilibrium effects such as pump-probe signals, the spatio-temporally 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
Knorr Andreas
Wacker Andreas
Weber Carsten
No associations
LandOfFree
Density-matrix theory of the optical dynamics and transport in quantum cascade structures: The role of coherence does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Density-matrix theory of the optical dynamics and transport in quantum cascade structures: The role of coherence, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Density-matrix theory of the optical dynamics and transport in quantum cascade structures: The role of coherence will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-338661