In-plane propagation of excitonic cavity polaritons

T. Freixanet (1) , B. Sermage (2) , A. Tiberj (2) , R. Planel (1)

1 L2M - Laboratoire de Microstructures et de Microélectronique
2 CNET Bagneux - France Telecom, Centre National d'Etudes de Télécommunications, Laboratoire de Bagneux

By exciting resonantly a microcavity with a pulsed laser beam, we have observed the in-plane propagation of excitonic cavity polaritons over distances much greater than the wavelength. The initial in-plane wave vector is conserved during the propagation, showing that it is a good quantum number for cavity polaritons. The polariton group velocities were measured as a function of both the in-plane wave vector and detuning. Propagation is faster for negative detunings where the polaritons have a light effective mass. The observations are in good agreement with a simple two-oscillator model.

Domaines: Physique [physics]; Science des matériaux [cond-mat.mtrl-sci]

T. Freixanet, B. Sermage, A. Tiberj, R. Planel. In-plane propagation of excitonic cavity polaritons. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2000, 61 (11), ⟨10.1103/PhysRevB.61.7233⟩. ⟨hal-01213439⟩