Giant spin Meissner effect in a nonequilibrium exciton-polariton gas

M. Król; R. Mirek; D. Stephan; K. Lekenta; J.-G. Rousset; W. Pacuski; A. V. Kavokin; M. Matuszewski; J. Szczytko; B. Piętka

doi:10.1103/PhysRevB.99.115318

Giant spin Meissner effect in a nonequilibrium exciton-polariton gas

M. Król, R. Mirek, D. Stephan, K. Lekenta, J.-G. Rousset, W. Pacuski, A. V. Kavokin, M. Matuszewski, J. Szczytko, B. Piętka

DOI 10.1103/PhysRevB.99.115318 · Physical Review B

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Abstract

The suppression of Zeeman energy splitting due to spin-dependent interactions (the spin Meissner effect) was predicted to occur within a Bose-Einstein condensate. We report a clear observation of this effect in semimagnetic microcavities which exhibit a giant Zeeman energy splitting between two spin-polarized polariton states as high as 2 meV and demonstrate that a partial suppression of the energy difference occurs already in the uncondensed phase in a striking similarity to the behavior of up-critical superconductors in the fluctuation-dominated regime. These observations are explained quantitatively by a kinetic model accounting for both the condensed and uncondensed polaritons and taking into account the nonequilibrium character of the system.