Stochastic spin flips in polariton condensates : nonlinear tuning from GHz to sub-Hz
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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.
Redondo , Y D V-I , Ohadi , H , Rubo , Y G , Beer , O , Ramsay , A J , Tsintzos , S , Hatzopoulos , Z , Savvidis , P G & Baumberg , J J 2018 , ' Stochastic spin flips in polariton condensates : nonlinear tuning from GHz to sub-Hz ' , New Journal of Physics , vol. 20 , 075008 . https://doi.org/10.1088/1367-2630/aad377
New Journal of Physics
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DescriptionWe acknowledge Grants No. EPSRC EP/L027151/1, ERC LINASS 320503, Leverhulme Trust Grant No. VP1-2013-011 and bilateral Greece-Russia 'Polisimulator' project co-financed by Greece and the EU Regional Development Fund. PS acknowledges Saint-Petersburg State University research grant 188.8.131.522 and ΑΕΝΑΟ project co-financed by the European Union ERDF and Greek national NSRF 2014-2020 funds. ST acknowledges financial support from the Stavros Niarchos Foundation, 'ARCHERS' project. AJR acknowledges support of Horizon 2020 programme (No. FETPROACT-2016 732894-HOT). YGR acknowledges support from CONACYT (Mexico) grant No. 251808 and by the Institute for Basic Science in Korea (IBS-R024-D1).
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