Phys. Rev. Lett. 100, 136806 (2008) [4 pages]Electrically Injected Cavity PolaritonsReceived 24 September 2007; published 4 April 2008 We have realized an electroluminescent device operating in the light-matter strong-coupling regime based on a GaAs/AlGaAs quantum cascade structure embedded in a planar microcavity. At zero bias, reflectivity measurements show a polariton anticrossing between the intersubband transition and the cavity mode. Under electrical injection the spectral features of the emitted light change drastically, as electrons are resonantly injected in a reduced part of the polariton branches. Our experiments demonstrate that electrons can be selectively injected into polariton states up to room temperature. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.136806
DOI:
10.1103/PhysRevLett.100.136806
PACS:
73.21.Fg, 73.40.Gk, 78.60.Fi, 85.60.Jb
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