Stochastic spin flips in polariton condensates: nonlinear tuning from GHz to sub-Hz

Yago del Valle-Inclan Redondo*, Hamid Ohadi, Yuri G. Rubo, Orr Beer, Andrew J. Ramsay, Symeon Tsintzos, Zacharias Hatzopoulos, Pavlos G. Savvidis, Jeremy J. Baumberg

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The stability of spin of macroscopic quantum states to intrinsic noise is studied for non-resonantly-pumped optically-trapped polariton condensates. We demonstrate flipping between the two spin-polarised states with >104 slow-down of the flip rate by tuning the optical pump power. Individual spin flips faster than 50 ps are time resolved using single-shot streak camera imaging. We reproduce our results within a mean-field model accounting for cross-spin scattering between excitons and polaritons, yielding a ratio of cross-to co-spin scattering of similar to ∼0.6, in contrast with previous literature suggestions.

Original languageEnglish
Article number075008
Number of pages8
JournalNew Journal of Physics
Volume20
DOIs
Publication statusPublished - 26 Jul 2018

Keywords

  • Exciton-polariton
  • Spin dynamics
  • Non-equilibrium condensate
  • Driven-dissipative
  • Chaos

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