Homogeneous broadening and excitation-induced dephasing of intersubband transitions in a quasi-two-dimensional electron gas

Robert A. Kaindl; Klaus Reimann; Michael Woerner; Thomas Elsaesser; R. Hey; K. H. Ploog

doi:10.1103/PhysRevB.63.161308

Homogeneous broadening and excitation-induced dephasing of intersubband transitions in a quasi-two-dimensional electron gas

Robert A. Kaindl, Klaus Reimann, Michael Woerner, Thomas Elsaesser, R. Hey, K. H. Ploog

Research output: Contribution to journal › Article › peer-review

60 Scopus citations

Abstract

The irreversible decay of coherent intersubband polarizations in n-type modulation-doped GaAs/Al_xGa_1-xAs quantum wells is studied by femtosecond time-integrated and time-resolved four-wave mixing. We provide the first direct evidence for predominant homogeneous broadening of intersubband resonances by intraband electron-electron scattering. Even at a low electron concentration of 5×10¹⁰ cm^-2 the dephasing time T₂=320 fs accounts fully for the 4 meV intersubband linewidth. For 6×10¹¹ electrons/cm² and strong excitation, athermal electron distributions show enhanced dephasing rates.

Original language	English (US)
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	63
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevB.63.161308
State	Published - 2001
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.63.161308

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abstract = "The irreversible decay of coherent intersubband polarizations in n-type modulation-doped GaAs/AlxGa1-xAs quantum wells is studied by femtosecond time-integrated and time-resolved four-wave mixing. We provide the first direct evidence for predominant homogeneous broadening of intersubband resonances by intraband electron-electron scattering. Even at a low electron concentration of 5×1010 cm-2 the dephasing time T2=320 fs accounts fully for the 4 meV intersubband linewidth. For 6×1011 electrons/cm2 and strong excitation, athermal electron distributions show enhanced dephasing rates.",

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AU - Kaindl, Robert A.

AU - Reimann, Klaus

AU - Woerner, Michael

AU - Elsaesser, Thomas

AU - Hey, R.

AU - Ploog, K. H.

PY - 2001

Y1 - 2001

N2 - The irreversible decay of coherent intersubband polarizations in n-type modulation-doped GaAs/AlxGa1-xAs quantum wells is studied by femtosecond time-integrated and time-resolved four-wave mixing. We provide the first direct evidence for predominant homogeneous broadening of intersubband resonances by intraband electron-electron scattering. Even at a low electron concentration of 5×1010 cm-2 the dephasing time T2=320 fs accounts fully for the 4 meV intersubband linewidth. For 6×1011 electrons/cm2 and strong excitation, athermal electron distributions show enhanced dephasing rates.

AB - The irreversible decay of coherent intersubband polarizations in n-type modulation-doped GaAs/AlxGa1-xAs quantum wells is studied by femtosecond time-integrated and time-resolved four-wave mixing. We provide the first direct evidence for predominant homogeneous broadening of intersubband resonances by intraband electron-electron scattering. Even at a low electron concentration of 5×1010 cm-2 the dephasing time T2=320 fs accounts fully for the 4 meV intersubband linewidth. For 6×1011 electrons/cm2 and strong excitation, athermal electron distributions show enhanced dephasing rates.

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IS - 16

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Homogeneous broadening and excitation-induced dephasing of intersubband transitions in a quasi-two-dimensional electron gas

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