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Ultrafast Dephasing and Collective Effects in the Quantum Hall Effect Regime
Author(s) -
Perakis I.E.,
Chemla D.S.
Publication year - 2002
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(200211)234:1<242::aid-pssb242>3.0.co;2-2
Subject(s) - dephasing , physics , ultrashort pulse , quasiparticle , exciton , coulomb , spectroscopy , condensed matter physics , landau quantization , quantum hall effect , fermi gas , quantum mechanics , electron , superconductivity , laser
Using time resolved four‐wave‐mixing (FWM) spectroscopy and many‐body theory we investigate the role of non‐instantaneous collective and correlation effects in the dynamics of the cold two dimensional electron gas (2DEG) in large magnetic fields. We find a strong non‐Markovian magnetoexciton dephasing and a strong time‐dependent Coulomb coupling between the Landau levels (LL), governed by the dynamics of the inter‐LL magnetoplasmon (MP) excitations. Our results show that ultrafast spectroscopy is a powerful tool for studying collective and strong correlation effects on the nanoscale.