Dephasing effects on coherent exciton-polaritons and the breaking of the strong coupling regime
arXiv:1507.08844 · doi:10.1103/PhysRevB.92.235305
Abstract
Using femtosecond pump-probe spectroscopy, we identify excitation induced dephasing as a major mechanism responsible for the breaking of the strong-coupling between excitons and photons in a semiconductor microcavity. The effects of dephasing are observed on the transmitted probe pulse spectrum as a density dependent broadening of the exciton-polariton resonances and the emergence of a third resonance at high excitation density. A striking asymmetry in the energy shift between the upper and the lower polaritons is also evidenced. Using the excitonic Bloch equations, we quantify the respective contributions to the energy shift of many-body effects associated with Fermion exchange and photon assisted exchange processes and the contribution to collisional broadening.
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- Nonlinear semiclassical spectroscopy of ultrafast molecular polariton dynamics
- Coherence of a non-equilibrium polariton condensate across the interaction-mediated phase transition
- Doubly dressed bosons - exciton-polaritons in a strong terahertz field
- Resolving exciton and polariton multi-particle correlations in an optical microcavity in the strong coupling regime
- Microcavity with saturable nonlinearity under simultaneous resonant and nonresonant pumping: multistability, Hopf bifurcations and chaotic behaviour
- Inverse-phase Rabi oscillations in semiconductor microcavities