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Two-photon photocurrent spectroscopy of electron intersubband relaxation and dephasing in quantum wells

Zwei-Photonen Spektroskopie der elektronischen Intersubband-Relaxation und des Phasenverlusts in Potentialtopfstrukturen
: Schneider, H.; Maier, T.; Walther, M.; Liu, H.C.


Applied Physics Letters 91 (2007), No.19, Art. 191116, 3 pp.
ISSN: 0003-6951
ISSN: 1077-3118
Journal Article
Fraunhofer IAF ()
two-photon spectroscopy; Zwei-Photonen-Spektroskopie; intersubband relaxation; Intersubband Relaxation; quantum-well; Quantentopf

Resonantly enhanced nonlinear absorption between conduction subbands in InGaAs/AlGaAs quantum wells induces a two-photon photocurrent under femtosecond excitation, which is exploited to determine electron intersubband relaxation and dephasing times. The approach allows us to study systematically the dependence of these time constants on structural parameters, including carrier density and modulation/well doping, and to discriminate between different scattering processes.