Optical control of spin textures in quasi-one-dimensional polariton condensates

Antón, C.; Morina, S.; Gao, Tingge; Eldridge, P. S.; Liew, Timothy Chi Hin; Martin, Michael; Hatzopoulos, Z.; Savvidis, P. G.; Shelykh, I. A.; Viña, L.

doi:10.1103/physrevb.91.075305

Cited by 33 publications

(25 citation statements)

References 56 publications

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“…However, in more recent experiments, a higher total degree of polarization was reported under circularly polarised non-resonant pulsed excitation rather than for linearly polarised excitation [27]. Moreover in polariton spin textures generated under circularly polarised excitation a high DCP was reported in the vicinity of the pump spot [16,17]. These experiments confirmed that there are correlations between the polarisation of the optical excitation with the polarisation of the condensate, which in GaAs/AlGaAs MCs are not screened from optical disorder.…”

Section: Introductionsupporting

confidence: 72%

“…Initial realizations of resonant polariton spinswitches [15], followed by experimental demonstrations of extensive polariton spin transport in planar [16] as well as 1D structures [17], has emphasized the potential of theoretical propositions for fully integrated polariton based spin circuits [18,19]. The short lifetime of polaritons considered to be an impediment for thermodynamic equilibrium and bosonic condensation can now be seen as an advantage in creating ultra-fast spin switching devices.…”

Section: Introductionmentioning

confidence: 99%

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Nonresonant optical control of a spinor polariton condensate

et al. 2016

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We investigate the spin dynamics of polariton condensates spatially separated from and effectively confined by the pumping exciton reservoir. We obtain a strong correlation between the ellipticity of the non-resonant optical pump and the degree of circular polarisation (DCP) of the condensate at the onset of condensation. With increasing excitation density we observe a reversal of the DCP. The spin dynamics of the trapped condensate are described within the framework of the spinor complex Ginzburg-Landau equations in the Josephson regime, where the dynamics of the system are reduced to a current-driven Josephson junction. We show that the observed spin reversal is due to the interplay between an internal Josephson coupling effect and the detuning of the two projections of the spinor condensate via transition from a synchronised to a desynchronised regime. These results suggest that spinor polariton condensates can be controlled by tuning the non-resonant excitation density offering applications in electrically pumped polariton spin switches.

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Section: Introductionsupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Nonresonant optical control of a spinor polariton condensate

et al. 2016

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“…Such a reservoir can be controllably replenished by a pump laser of the selected polarization, thus opening up the way to create and manipulate spinor condensates of excitonpolaritons in the regime of incoherent far off-resonant optical excitation 9 .…”

Section: Introductionmentioning

confidence: 99%

Incoherent excitation and switching of spin states in exciton-polariton condensates

Liew

Egorov

et al. 2015

Phys. Rev. B

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We investigate, theoretically and numerically, the spin dynamics of a two-component excitonpolariton condensate created and sustained by non-resonant spin-polarized optical pumping of a semiconductor microcavity. Using the open-dissipative mean-field model, we show that the existence of well defined phase-locked steady states of the condensate may lead to efficient switching and control of spin (polarization) states with a non-resonant excitation. Spatially inhomogeneous pulsed excitations can cause symmetry breaking in the pseudo-spin structure of the condensate and lead to formation of non-trivial spin textures. Our model is universally applicable to two weakly coupled polariton condensates, and therefore can also describe the behaviour of condensate populations and phases in 'double-well' type potentials.

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“…The angle of detection ( ) is directly related to the parallel component of the polariton momentum, k//, by k// . Low temperature (10 K) continuous wave photoluminescence (PL) measurements (not shown) reveal that the emission spectrum of the sample is composed of a broad band between 1.5480 eV and 1.5420 eV, originating from the excitonic recombination [35] together with several narrow lower polariton branches (LPBs), between 1.5420 eV and 1.5398 eV, arising from the confinement along the narrow dimension of the ridge. Under resonant excitation conditions the phase of the polariton condensates would be inherited from that of the laser pulses, therefore to study the genuine condensates' coherence we excite quasi-resonantly, at 1.5459 eV.…”

Section: Resultsmentioning

confidence: 99%

Temperature dependence of the coherence in polariton condensates

et al. 2018

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We present a time-resolved experimental study of the temperature effect on the coherence of traveling polariton condensates. The simultaneous detection of their emission both in real-and reciprocal-space allows us to fully monitor the condensates' dynamics. We obtain fringes in reciprocal-space as a result of the interference between polariton wavepackets (WPs) traveling with the same speed. The periodicity of these fringes is inversely proportional to the spatial distance between the interfering WPs. In a similar fashion, we obtain interference fringes in real-space when WPs traveling in opposite directions meet. The visibility of both real-and reciprocal-space interference fringes rapidly decreases with increasing temperature and vanishes. A theoretical description of the phase transition, considering the coexistence of condensed and non-condensed particles, for an out-of-equilibrium condensate such as ours is still missing. Yet a comparison with theories developed for atomic condensates allows us to infer a critical temperature for the BEC-like transition when the visibility goes to zero.

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Optical control of spin textures in quasi-one-dimensional polariton condensates

Cited by 33 publications

References 56 publications

Nonresonant optical control of a spinor polariton condensate

Nonresonant optical control of a spinor polariton condensate

Incoherent excitation and switching of spin states in exciton-polariton condensates

Temperature dependence of the coherence in polariton condensates

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