Femtosecond dynamics of excitons under extreme magnetic confinement

J. B. Stark, W. H. Knox, D. S. Chemla, W. Schäfer, S. Schmitt-Rink, C. Stafford

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The resonant optical nonlinearities of GaAs/AlGaAs quantum wells are measured with femtosecond time resolution, as the quasi-two-dimensional states are further confined into quasizero dimensions by a perpendicular magnetic field. We apply fields up to 12 T to demonstrate that exciton-exciton Coulomb interactions are strongly modified by quasi-zero dimensional confinement, in agreement with many-body theory. These measurements demonstrate for the first time the remarkable result that at high magnetic fields an ensemble of 1s, electron-hole pairs behaves like a gas of noninteracting particles.

Original languageEnglish (US)
Pages (from-to)3033-3036
Number of pages4
JournalPhysical review letters
Issue number24
StatePublished - Jan 1 1990
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Stark, J. B., Knox, W. H., Chemla, D. S., Schäfer, W., Schmitt-Rink, S., & Stafford, C. (1990). Femtosecond dynamics of excitons under extreme magnetic confinement. Physical review letters, 65(24), 3033-3036. https://doi.org/10.1103/PhysRevLett.65.3033