Spin resonance induced by a mechanical rotation of a polariton condensate

TL;DR

This paper theoretically explores how mechanical rotation of a polariton condensate in a ring-shaped trap can induce spin resonance phenomena, revealing a novel way to control polariton spin states through mechanical means.

Contribution

It introduces a theoretical framework showing that mechanical rotation can induce spin resonance in polariton condensates, enabling control over their polarization and angular momentum.

Findings

Mechanical rotation induces polarization beats in polariton condensates.

The coupling between pseudospin and angular momentum follows specific selection rules.

Polariton spin resonance can be achieved without magnetic fields, via mechanical rotation.

Abstract

We study theoretically the polarization dynamics in a ring-shape bosonic condensate of exciton-polaritons confined in a rotating trap. The interplay between the rotating potential and TE-TM splitting of polariton modes offers a tool of control over the spin state and the angular momentum of the condensate. Specific selection rules describing the coupling of pseudospin and angular momentum are formulated. The resonant coupling between states having linear and circular polarizations leads to the polarization beats. The effect may be seen as a polariton analogy to the electronic magnetic resonance in the presence of constant and rotating magnetic fields. Remarkably, spin beats are induced by a purely mechanical rotation of the condensate.