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

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PhysRevX.5.031002.pdf (1.444Mb)
Date
08/07/2015
Author
Ohadi, H.
Dreismann, A.
Rubo, Y. G.
Pinsker, F.
del Valle-Inclan Redondo, Y.
Tsintzos, S. I.
Hatzopoulos, Z.
Savvidis, P. G.
Baumberg, J. J.
Keywords
Condensed matter physics
Magnetism
Nonlinear dynamics
Semiconductor physics
QC Physics
DAS
BDC
R2C
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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.
Citation
Ohadi , H , Dreismann , A , Rubo , Y G , Pinsker , F , del Valle-Inclan Redondo , Y , Tsintzos , S I , Hatzopoulos , Z , Savvidis , P G & Baumberg , J J 2015 , ' Spontaneous spin bifurcations and ferromagnetic phase transitions in a spinor exciton-polariton condensate ' , Physical Review X , vol. 5 , no. 3 , 031002 , pp. 1-18 . https://doi.org/10.1103/PhysRevX.5.031002
Publication
Physical Review X
Status
Peer reviewed
DOI
https://doi.org/10.1103/PhysRevX.5.031002
ISSN
2160-3308
Type
Journal article
Rights
Copyright © 2015 the Author(s). Published by the American Physical Society. This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/18756

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