Abstract
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 language | English (US) |
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Pages (from-to) | 3033-3036 |
Number of pages | 4 |
Journal | Physical review letters |
Volume | 65 |
Issue number | 24 |
DOIs | |
State | Published - 1990 |
ASJC Scopus subject areas
- Physics and Astronomy(all)