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Coherent Intersubband Polarizations in a Quasi‐Two‐Dimensional Electron Plasma Studied by Femtosecond Four‐Wave‐Mixing in the Mid‐Infrared
Author(s) -
Kaindl R. A.,
Lutgen S.,
Woerner M.,
Elsaesser T.,
Hase A.,
Künzel H.
Publication year - 1997
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(199711)204:1<27::aid-pssb27>3.0.co;2-#
Subject(s) - femtosecond , mixing (physics) , infrared , electron , plasma , four wave mixing , atomic physics , physics , materials science , optics , laser , nonlinear optics , quantum mechanics
We present the first study of the ultrafast dynamics of coherent intersubband polarizations in a two‐dimensional electron plasma using femtosecond four‐wave‐mixing in the mid‐infrared. Experiments with modulation‐doped GaInAs/AlInAs multiple‐quantum‐well samples of different doping concentrations show a fast decay of the coherent third‐order intersubband polarization on a sub‐500 fs time scale, depending strongly on carrier density and lattice temperature. Electron–electron scattering is identified as the main dephasing scattering mechanism.