Tunable Magnetic Alignment between Trapped Exciton-Polariton Condensates.

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Del Valle-Inclan Redondo, Yago  ORCID logo  https://orcid.org/0000-0003-0886-7226
Dreismann, A 
Rubo, YG 
Pinsker, F 

Tunable spin correlations are found to arise between two neighboring trapped exciton-polariton condensates which spin polarize spontaneously. We observe a crossover from an antiferromagnetic to a ferromagnetic pair state by reducing the coupling barrier in real time using control of the imprinted pattern of pump light. Fast optical switching of both condensates is then achieved by resonantly but weakly triggering only a single condensate. These effects can be explained as the competition between spin bifurcations and spin-preserving Josephson coupling between the two condensates, and open the way to polariton Bose-Hubbard ladders.

cond-mat.other, cond-mat.other
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Phys Rev Lett
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American Physical Society (APS)
Engineering and Physical Sciences Research Council (EP/G060649/1)
Engineering and Physical Sciences Research Council (EP/L027151/1)
European Research Council (320503)
Engineering and Physical Sciences Research Council (EP/M013243/1)
European Commission (289968)
This work was supported by EPSRC Grant No. EP/G060649/1, EP/L027151/1, EU Grant No. INDEX 289968, ERC Grant No. LINASS 320503, the Leverhulme Trust Grant No. VP1-2013-011, Spanish MEC (Grant No. MAT2008-01555), the Greek GSRT ARISTEIA Apollo program and Fundación La Caixa, and Mexican CONACYT Grant No. 251808. FP acknowledges financial support through a Schrödinger Fellowship at the University of Oxford and NQIT project (EP/M013243/1).