Abstract
The authors report the observation of electroluminescence from GaAs-based semiconductor microcavities in the strong coupling regime. At low current densities, the emission consists of two peaks, which exhibit anticrossing behavior as a function of detection angle and thus originate from polariton states. With increasing carrier injection, we observe a progressive transition from strong to weak coupling due to screening of the exciton resonance by free carriers. The demonstration that polariton emission can be excited by electrical injection is encouraging for future development of polariton lasers.
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