Coherent nonlinear dynamics of intersubband excitations in a two-dimensional electron gas

M. Woerner; R. A. Kaindl; F. Eickemeyer; K. Reimann; T. Elsaesser; A. M. Weiner; R. Hey; K. H. Ploog

doi:10.1016/S0921-4526(01)01403-X

Coherent nonlinear dynamics of intersubband excitations in a two-dimensional electron gas

M. Woerner, R. A. Kaindl, F. Eickemeyer, K. Reimann, T. Elsaesser, A. M. Weiner, R. Hey, K. H. Ploog

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

10 Scopus citations

Abstract

Femtosecond midinfrared four-wave mixing is used to study the ultrafast dynamics of coherent intersubband polarizations in n-type modulation-doped GaAs/AlGaAs quantum wells. Time-integrated four-wave mixing yields a dephasing time of T₂ = 320 fs, independent of excitation density. Time-resolved four-wave mixing unambiguously shows that the intersubband transition is purely homogeneously broadened by intraband Coulomb scattering within the low-density (n = 5 × 10¹⁰ cm^-2) electron plasma. The nonlinear propagation of tailored midinfrared pulses is studied by electro-optic sampling, which allows direct time-resolved measurements of the electric field transients. Excitation pulses of only 1 pJ energy are needed to observe partial Rabi flops of up to 60° in the Bloch sphere.

Original language	English (US)
Pages (from-to)	244-247
Number of pages	4
Journal	Physica B: Condensed Matter
Volume	314
Issue number	1-4
DOIs	https://doi.org/10.1016/S0921-4526(01)01403-X
State	Published - Mar 2002
Externally published	Yes

Keywords

Coherent polarization
Intersubband transitions
Quantum wells

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

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10.1016/S0921-4526(01)01403-X

Cite this

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title = "Coherent nonlinear dynamics of intersubband excitations in a two-dimensional electron gas",

abstract = "Femtosecond midinfrared four-wave mixing is used to study the ultrafast dynamics of coherent intersubband polarizations in n-type modulation-doped GaAs/AlGaAs quantum wells. Time-integrated four-wave mixing yields a dephasing time of T2 = 320 fs, independent of excitation density. Time-resolved four-wave mixing unambiguously shows that the intersubband transition is purely homogeneously broadened by intraband Coulomb scattering within the low-density (n = 5 × 1010 cm-2) electron plasma. The nonlinear propagation of tailored midinfrared pulses is studied by electro-optic sampling, which allows direct time-resolved measurements of the electric field transients. Excitation pulses of only 1 pJ energy are needed to observe partial Rabi flops of up to 60° in the Bloch sphere.",

keywords = "Coherent polarization, Intersubband transitions, Quantum wells",

author = "M. Woerner and Kaindl, {R. A.} and F. Eickemeyer and K. Reimann and T. Elsaesser and Weiner, {A. M.} and R. Hey and Ploog, {K. H.}",

year = "2002",

month = mar,

doi = "10.1016/S0921-4526(01)01403-X",

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volume = "314",

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T1 - Coherent nonlinear dynamics of intersubband excitations in a two-dimensional electron gas

AU - Woerner, M.

AU - Kaindl, R. A.

AU - Eickemeyer, F.

AU - Reimann, K.

AU - Elsaesser, T.

AU - Weiner, A. M.

AU - Hey, R.

AU - Ploog, K. H.

PY - 2002/3

Y1 - 2002/3

N2 - Femtosecond midinfrared four-wave mixing is used to study the ultrafast dynamics of coherent intersubband polarizations in n-type modulation-doped GaAs/AlGaAs quantum wells. Time-integrated four-wave mixing yields a dephasing time of T2 = 320 fs, independent of excitation density. Time-resolved four-wave mixing unambiguously shows that the intersubband transition is purely homogeneously broadened by intraband Coulomb scattering within the low-density (n = 5 × 1010 cm-2) electron plasma. The nonlinear propagation of tailored midinfrared pulses is studied by electro-optic sampling, which allows direct time-resolved measurements of the electric field transients. Excitation pulses of only 1 pJ energy are needed to observe partial Rabi flops of up to 60° in the Bloch sphere.

AB - Femtosecond midinfrared four-wave mixing is used to study the ultrafast dynamics of coherent intersubband polarizations in n-type modulation-doped GaAs/AlGaAs quantum wells. Time-integrated four-wave mixing yields a dephasing time of T2 = 320 fs, independent of excitation density. Time-resolved four-wave mixing unambiguously shows that the intersubband transition is purely homogeneously broadened by intraband Coulomb scattering within the low-density (n = 5 × 1010 cm-2) electron plasma. The nonlinear propagation of tailored midinfrared pulses is studied by electro-optic sampling, which allows direct time-resolved measurements of the electric field transients. Excitation pulses of only 1 pJ energy are needed to observe partial Rabi flops of up to 60° in the Bloch sphere.

KW - Coherent polarization

KW - Intersubband transitions

KW - Quantum wells

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U2 - 10.1016/S0921-4526(01)01403-X

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JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

IS - 1-4

ER -

Coherent nonlinear dynamics of intersubband excitations in a two-dimensional electron gas

Abstract

Keywords

ASJC Scopus subject areas

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