Nonequilibrium transitions, chaos, and chimera states in exciton—polariton systems
S.S. Gavrilova,b aOsipyan Institute of Solid State Physics, Russian Academy of Sciences, Akademika Osip'yana str. 2, Chernogolovka, Moscow Region, 142432, Russian Federation bNational Research University Higher School of Economics, ul. Myasnitskaya 20, Moscow, 101000, Russian Federation
The review is devoted to exciton polaritons, short-lived Bose particles which are optically excited in semiconductors and form macroscopically coherent states under the conditions of coherent and resonant external driving. Interaction of polaritons results in multistability, spontaneous breaking of spin and spatial symmetries, self-pulsations, and pattern formation. As a result of symmetry breaking, paradoxical 'chimera states' can arise in which ordered and chaotic subsystems coexist and in some way complement each other.