Spontaneous spin bifurcations and ferromagnetic phase transitions in a spinor exciton-polariton condensate

H. Ohadi, A. Dreismann, Y. G. Rubo, F. Pinsker, Y. del Valle-Inclan Redondo, S. I. Tsintzos, Z. Hatzopoulos, P. G. Savvidis, J. J. Baumberg

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Abstract

We observe a spontaneous parity breaking bifurcation to a ferromagnetic state in a spatially trapped exciton-polariton condensate. At a critical bifurcation density under nonresonant excitation, the whole condensate spontaneously magnetizes and randomly adopts one of two elliptically polarized (up to 95% circularly polarized) states with opposite handedness of polarization. The magnetized condensate remains stable for many seconds at 5 K, but at higher temperatures, it can flip from one magnetic orientation to another. We optically address these states and demonstrate the inversion of the magnetic state by resonantly injecting 100- fold weaker pulses of opposite spin. Theoretically, these phenomena can be well described as spontaneous symmetry breaking of the spin degree of freedom induced by different loss rates of the linear polarizations.
Original languageEnglish
Article number031002
Pages (from-to)1-18
Number of pages18
JournalPhysical Review X
Volume5
Issue number3
DOIs
Publication statusPublished - 8 Jul 2015

Keywords

  • Condensed matter physics
  • Magnetism
  • Nonlinear dynamics
  • Semiconductor physics

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