Symeon Tsintzos - Academia.edu (original) (raw)
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Papers by Symeon Tsintzos
Data used to create the figures in "Stochastic spin flips in polariton condensates: nonlinea... more Data used to create the figures in "Stochastic spin flips in polariton condensates: nonlinear tuning from GHz to sub-Hz". Part of del Valle-Inclan Redondo's thesis "Spin and lattice properties of optically trapped exciton polaritons"
New Journal of Physics, 2018
The stability of spin of macroscopic quantum states to intrinsic noise is studied for non-resonan... more The stability of spin of macroscopic quantum states to intrinsic noise is studied for non-resonantlypumped optically-trapped polariton condensates. We demonstrate flipping between the two spinpolarised states with >10 4 slowdown of the flip rate by tuning the optical pump power. Individual spin flips faster than 50 ps are time resolved using single-shot streak camera imaging. We reproduce our results within a mean-field model accounting for cross-spin scattering between excitons and polaritons, yielding a ratio of cross-to co-spin scattering of ∼0.6, in contrast with previous literature suggestions.
Journal of Physics: Condensed Matter, 2020
Spatially confined, trapped polariton condensates have been shown to exhibit strong stochastic on... more Spatially confined, trapped polariton condensates have been shown to exhibit strong stochastic on-site spin polarization and in longer polariton condensate chains, distance controlled ferromagnetic and antiferromagnetic spin couplings. Until now, little is known, on how such polariton condensates spatially separated from their exciton reservoirs are trapped and formed. Here, we investigate the properties and formation dynamics of two main families of polariton condensates, those overlapping with the pump reservoir and those in confined geometries, under pulsed nonresonant excitation. The observed reduction in polariton condensation threshold and energy blueshift in trapped case is attributed to exciton reservoir-condensate spatial separation, whereas time-resolved photoluminescence measurements, reveal distinct relaxation and condensate formation dynamics with pair parametric scattering process being the dominant relaxation mechanism in trapped geometry.
New Journal of Physics, 2018
Data used to create the figures in "Stochastic spin flips in polariton condensates: nonlinea... more Data used to create the figures in "Stochastic spin flips in polariton condensates: nonlinear tuning from GHz to sub-Hz". Part of del Valle-Inclan Redondo's thesis "Spin and lattice properties of optically trapped exciton polaritons"
New Journal of Physics, 2018
The stability of spin of macroscopic quantum states to intrinsic noise is studied for non-resonan... more The stability of spin of macroscopic quantum states to intrinsic noise is studied for non-resonantlypumped optically-trapped polariton condensates. We demonstrate flipping between the two spinpolarised states with >10 4 slowdown of the flip rate by tuning the optical pump power. Individual spin flips faster than 50 ps are time resolved using single-shot streak camera imaging. We reproduce our results within a mean-field model accounting for cross-spin scattering between excitons and polaritons, yielding a ratio of cross-to co-spin scattering of ∼0.6, in contrast with previous literature suggestions.
Journal of Physics: Condensed Matter, 2020
Spatially confined, trapped polariton condensates have been shown to exhibit strong stochastic on... more Spatially confined, trapped polariton condensates have been shown to exhibit strong stochastic on-site spin polarization and in longer polariton condensate chains, distance controlled ferromagnetic and antiferromagnetic spin couplings. Until now, little is known, on how such polariton condensates spatially separated from their exciton reservoirs are trapped and formed. Here, we investigate the properties and formation dynamics of two main families of polariton condensates, those overlapping with the pump reservoir and those in confined geometries, under pulsed nonresonant excitation. The observed reduction in polariton condensation threshold and energy blueshift in trapped case is attributed to exciton reservoir-condensate spatial separation, whereas time-resolved photoluminescence measurements, reveal distinct relaxation and condensate formation dynamics with pair parametric scattering process being the dominant relaxation mechanism in trapped geometry.
New Journal of Physics, 2018