Polaritons in microcavities containing a two-dimensional electron gas

A. Qarry, R. Rapaport, G. Ramon, E. Cohen, Arza Ron, L. N. Pfeiffer

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We review the spectroscopic and dynamic properties of cavity polaritons in a λ-wide GaAs/GaAlAs microcavity (MC) structure having a single GaAs/AlAs quantum well in which a variable density two-dimensional electron gas (2DEG) is photoexcited, with a density in the range 0 < ne < 5 × 1011 cm-2. The main observed effects that will be discussed here are: (a) photoexcitation of negatively charged polaritons. These polaritons result of the coupling of the MC photon and the negatively charged excitons. They appear at low temperatures (T < 25 K), in the range of low 2DEG densities (ne < 5 × 1010 cm-2), and their coupling strength increases as √ne. (b) The effect of electron-polariton scattering on the polariton spectral linewidth, its complex dependence on the detuning energy, and the electron-induced transition from strong to weak coupling regimes, as ne increases. (c) The efficient polariton transfer across the relaxation bottleneck in the lower branch induced by electron-polariton scattering, and the resulting non-linear dependence of the polariton photoluminescence intensity on ne.

Original languageEnglish (US)
Pages (from-to)S331-S338
JournalSemiconductor Science and Technology
Issue number10
StatePublished - Oct 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry


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