Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 50: Poster Session: Correlated Electrons 2

TT 50.26: Poster

Mittwoch, 3. April 2019, 15:00–18:30, Poster D

Laser Control of Topological Polaritons — •Damian Hofmann and Michael Sentef — Max Planck Institute for the Structure and Dynamics of Matter, Luruper Chaussee 149, 22761 Hamburg, Germany

Polaritons are quasiparticles consisting of a superposition of photons and excitons. We study a semiconductor microcavity system in which multiple semiconductor layers are coupled to a single photonic mode. A momentum-dependent complex phase in the exciton-photon coupling gives rise to non-trivial topological properties of the polariton bands. In particular, the system possesses chiral edge modes which can be excited by optical pumping near the sample boundary.

We simulate the dynamics of the driven system in the semi-classical approximation using a Gross-Pitaevskii-type equation. This allows us to study topologically protected chiral transport along the edges of a finite sample. We further discuss the dynamics of a lattice version of the topological polariton model, from which we obtain time-resolved spectral information and demonstrate the selective excitation of the edge modes.