Density-matrix theory of the optical dynamics and transport in quantum cascade structures: The role of coherence

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dc.creatorWeber, C.
dc.creatorWacker, A.
dc.creatorKnorr, A.
dc.date2008-11-23
dc.date2009-05-12
dc.date.accessioned2026-07-07T13:13:21Z
dc.date.available2026-07-07T13:13:21Z
dc.descriptionThe 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
dc.description14 pages, 11 figures; final version
dc.identifierhttps://arxiv.org/abs/0811.3736
dc.identifierhttp://arxiv.org/abs/0811.3736
dc.identifierPhys. Rev. B 79, 165322 (2009)
dc.identifierdoi:10.1103/PhysRevB.79.165322
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/229863
dc.subjectMesoscale and Nanoscale Physics
dc.titleDensity-matrix theory of the optical dynamics and transport in quantum cascade structures: The role of coherence
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