Suppression of ground-state optical recombination in the quantum Hall regime
- 15 March 1992
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 45 (12) , 6957-6960
- https://doi.org/10.1103/physrevb.45.6957
Abstract
The time evolution of optical recombination in the two-dimensional electron gas in GaAs/(Ga,Al)As heterostructures shows an anomalous increase at the Landau-level filling factor ν=1. Here we find that the radiative recombination rate is slowed by an order of magnitude and is commensurate with the quantum Hall effect. The inhibited electron-hole recombination is caused by localization and changes in the screening response of the electron gas, which leads to reduced electron-hole overlap and broadening of the density of states. These mechanisms are also manifest in a large increase in hole relaxation time at ν=1.Keywords
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