Observation of inversion, hysteresis, and collapse of spin in optically trapped polariton condensates

We acknowledgeGrants No. EPSRC EP/L027151/1 and No. 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. H.S. acknowledgessupport by the Research Fund of the University of Iceland, The IcelandicResearch Fund, Grant No. 163082-051. The work of IAS on theoretical analysis of the discovered effects was supported by the Ministry of Education and Science of Russian Federation, Projects 14.Y26.31.0015 and 3.2614.2017/4.6. Y.G.R. acknowledgessupport from CONACYT (Mexico) under Grant No. 251808. The work of PS on structure growth and characterization was supported by Russian Science Foundation, Grant No. 19-72-20120.