Cavity quantum electrodynamics with many-body states of a two-dimensional electron gas

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Science  02 Oct 2014:
DOI: 10.1126/science.1258595

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Light-matter interaction has played a central role in understanding as well as engineering new states of matter. Reversible coupling of excitons and photons enabled groundbreaking results in condensation and superfluidity of nonequilibrium quasiparticles with a photonic component. We investigate such cavity-polaritons in the presence of a high-mobility two-dimensional electron gas, exhibiting strongly correlated phases. When the cavity is on resonance with the Fermi level, we observe novel many-body physics associated with a dynamical hole scattering potential. In finite magnetic fields, polaritons show unique signatures of integer and fractional quantum Hall ground states. Our results lay the groundwork for probing nonequilibrium dynamics of quantum Hall states and exploiting the electron density dependence of polariton splitting to obtain ultrastrong optical nonlinearities.

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