Patrick Knüppel

TL;DR: This work performs cavity spectroscopy of a two-dimensional electron system in the strong coupling regime, where polariton resonances carry signatures of strongly correlated quantum Hall phases and demonstrates the modification of polaron dressing that is associated with filling factor dependent electron-exciton interactions.

TL;DR: P polarization-resolved resonant reflection spectroscopy of a charge-tunable atomically thin valley semiconductor hosting tightly bound excitons coupled to a dilute system of fully spin- and valley-polarized holes in the presence of a strong magnetic field finds that exciton-hole interactions manifest themselves in hole-density dependent, Shubnikov-de Haas-like oscillations in the energy and line broadening of the excitonic resonances.

TL;DR: Time-resolved four-wave-mixing experiments on a two-dimensional electron system embedded in an optical cavity show enhanced polariton–polariton interactions in the fractional quantum Hall regime, which could facilitate the realization of strongly interacting photonic systems, and suggest that nonlinear optical measurements could provide information about fractional Quantum Hall states that is not accessible through their linear optical response.

TL;DR: In this paper, a two-dimensional electron system embedded in an optical cavity was investigated and it was shown that polariton-polariton interactions are strongly enhanced when the electrons are initially in a fractional quantum Hall state.

TL;DR: Combining photons with electronic excitations creates a new kind of quasiparticle that can be manipulated with electric or magnetic fields as mentioned in this paper, which can be used to create a new type of quasi-particle.