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Coherent carrier propagation in the continuum of asymmetric quantum-well structures

Kohärente Ladungsträgerpropagation im Kontinuum asymmetrischer Quantenfilmstrukturen
: Schönbein, C.; Schneider, H.; Walther, M.


Physical Review. B 60 (1999), No.20, pp.R13993-R13996
ISSN: 0163-1829
ISSN: 1098-0121
ISSN: 0556-2805
Journal Article
Fraunhofer IAF ()
coherent transport; intersubband excitation; GaAs/AlGaAs; kohärenter Transport; Intersubband-Anregung

In specific GaAs/Al(x)Ga(1-x)As quantum-well structures with a lack of inversion symmetry, the spectral dependence of the bound-to-continuum photocurrent shows sign reversals as a function of the excitation energy. These sign reversals can be explained in terms of coherently propagating carriers, which experience constructive or destructive interference according to their associated de Broglie wavelength. We show how a coherent control of the carrier motioning the continuum states can be achieved experimentally in appropriate quantum-well structures. A theoretical approach to simulate the observed current sign reversal is presented.