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Proceedings Paper

Coherent control of intersubbband optical gain and phonon emission in semiconductor heterostructures
Author(s): Xuedong Hu; Walter Poetz
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Paper Abstract

We present results for two coherent control schemes in semiconductor heterostructures obtained within Boltzmann- Bloch equations. The latter are obtained from Dyson's equation within the Keldysh nonequilibrium Green's function approach and allow a microscopic analysis of coherent control schemes in semiconductors. Here we focus on the coherent control of optical gain and longitudinal optical photon emission rates in intersubband transitions in a three-subband model of a biased asymmetric double well. We show that by coupling the two energetically close subbands with a coherent microwave field, we can induce coherence into the carriers in the double well, thus manipulating intersubband transitions. By adjusting the phase of the microwave field, we can achieve significant modification to the gain spectra for light pulses shorter than the period of the low frequency intersubband polarization. Similarly, LO- phonon induced intersubband transitions can be controlled due to quantum interference between electron-lattice and electron-light interactions.

Paper Details

Date Published: 24 May 1999
PDF: 7 pages
Proc. SPIE 3624, Ultrafast Phenomena in Semiconductors III, (24 May 1999); doi: 10.1117/12.349286
Show Author Affiliations
Xuedong Hu, Univ. of Maryland/College Park (United States)
Walter Poetz, Univ. of Illinois/Chicago (United States)

Published in SPIE Proceedings Vol. 3624:
Ultrafast Phenomena in Semiconductors III
Kong-Thon F. Tsen, Editor(s)

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