Spontaneous spin bifurcations and ferromagnetic phase transitions in a spinor exciton-polariton condensate
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.
Keywords
Cite
@article{arxiv.1507.02471,
title = {Spontaneous spin bifurcations and ferromagnetic phase transitions in a spinor exciton-polariton condensate},
author = {H. Ohadi and A. Dreismann and Y. G. Rubo and F. Pinsker and Y. del Valle-Inclan Redondo and S. I. Tsintzos and Z. Hatzopoulos and P. G. Savvidis and J. J. Baumberg},
journal= {arXiv preprint arXiv:1507.02471},
year = {2015}
}
Comments
18 pages, 12 figures