The Non-linear Optical Spin Hall Effect and Long-Range Spin Transport in Polariton Lasers

TL;DR

This paper reports the experimental observation of a non-linear optical spin Hall effect in exciton polariton condensates, demonstrating long-range spin transport and coherent spin precession over macroscopic distances.

Contribution

It introduces the first experimental demonstration of the non-linear optical spin Hall effect in polariton condensates, revealing long-range spin transport and coherent spin dynamics.

Findings

Polariton condensates propagate over macroscopic distances.

Condensate spins coherently precess around an effective magnetic field.

Up to four complete revolutions of spin precession observed.

Abstract

We report on the experimental observation of the non-linear analogue of the optical spin Hall effect under highly non-resonant circularly polarized excitation of an exciton polariton condensate in a GaAs/AlGaAs microcavity. Initially circularly polarized polariton condensates propagate over macroscopic distances while the collective condensate spins coherently precess around an effective magnetic field in the sample plane performing up to four complete revolutions.