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Four‐wave mixing in modulation‐doped GaAs quantum wells under strong magnetic fields
Author(s) -
BarJoseph I.,
Finkelstein G.,
BarAd S.,
Shtrikman H.,
Levinson Y.
Publication year - 1995
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/pssb.2221880143
Subject(s) - dephasing , condensed matter physics , magnetic field , physics , quantum well , scattering , electron , absorption edge , quantum oscillations , optics , fermi surface , quantum mechanics , band gap , superconductivity , laser
Time‐resolved four‐wave mixing is used to study electron scattering in modulation‐doped GaAs quantum wells in high magnetic fields up to 8T. A strong increase in dephasing times in strong magnetic fields is observed and attributed to a decrease in the scattering rates relative to zero field. An early time signal in high magnetic field is found, which is due to a polarization interaction process. A strong enhancement of the signal at the absorption edge is measured which is attributed to the Fermi edge singularity.