期刊
PHYSICAL REVIEW X
卷 5, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevX.5.031002
关键词
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资金
- EPSRC [EP/G060649/1, EP/L027151/1]
- EU [CLERMONT4 235114, INDEX 289968]
- ERC [LINASS 320503]
- Leverhulme Trust [VP1-2013-011]
- Spanish MEC [MAT2008-01555]
- Greek GSRT ARISTEIA Apollo program
- Mexican CONACYT [251808]
- EPSRC at the University of Cambridge
- Schrodinger grant at the University of Oxford
- Fundacion La Caixa
- Austrian Science Fund (FWF) [J 3675] Funding Source: researchfish
- Engineering and Physical Sciences Research Council [EP/G060649/1, EP/L027151/1, EP/K028510/1] Funding Source: researchfish
- EPSRC [EP/G060649/1, EP/L027151/1, EP/K028510/1] Funding Source: UKRI
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.
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