Spin multistability of cavity polaritons in a magnetic field

TL;DR

This paper investigates the spin multistability of cavity polaritons in a magnetic field, demonstrating how pump intensity tuning enables ultra-fast spin switching on a picosecond scale through interplay of interactions and Zeeman effects.

Contribution

It provides both theoretical and experimental insights into spin dynamics of cavity polaritons, revealing a novel method for ultra-fast spin control via pump intensity tuning.

Findings

Fast and massive spin flips occur at critical amplitudes.

Dominant spin can be toggled by pump intensity.

Spin switching occurs on a picosecond timescale.

Abstract

Spin transitions are studied theoretically and experimentally in a resonantly excited system of cavity polaritons in a magnetic field. Weak pair interactions in this boson system make possible fast and massive spin flips occurring at critical amplitudes due to the interplay between amplitude dependent shifts of eigenstates and the Zeeman splitting. Dominant spin of a condensate can be toggled forth and back by tuning of the pump intensity only, which opens the way for ultra-fast spin switchings of polariton condensates on a picosecond timescale.