Ultrafast coherent nonlinear dynamics of intersubband excitations in a quasi-two-dimensional electron gas

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

Research output: Contribution to journalArticlepeer-review

Abstract

The ultrafast dynamics of coherent intersubband polarizations in n-type modulation-doped GaAs/AlGaAs quantum wells is studied by femtosecond time-integrated and time-resolved four-wave-mixing. At a low electron density of 5 × 1010 cm-2, intraband Coulomb scattering results in irreversible dephasing with a decay time of T2 = 320 fs which is independent of excitation density and fully accounts for the 3.7 meV linewidth of the intersubband transition. Nonlinear propagation of tailored mid-infrared field transients is studied using amplitude and phase-resolved detection. A coherent response corresponding to partial Rabi flops of up to 60° in the Bloch sphere is observed with excitation pulses of only 1 pJ energy.

Original languageEnglish (US)
Pages (from-to)477-480
Number of pages4
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume13
Issue number2-4
DOIs
StatePublished - Mar 2002
Externally publishedYes

Keywords

  • Coherent polarization
  • Intersubband transitions
  • Quantum wells

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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