Abstract
We analyze the photoluminescence of a nonequilibrium polariton condensate in cylindrical micropillars etched on the surface of a high-Q GaAs microcavity in a wide range of detunings in a magnetic field up to 12 T for various levels of nonresonant laser pumping by nanosecond pulses. With such a method of excitation, a considerable effect of the interaction of the reservoir of photoexcited excitons with the condensate on the Zeeman splitting of the polariton condensate levels can be expected, which can lead to a decrease in its value and even to sign reversal. However, the measurements of photoluminescence in a wide range of optical excitation densities show that Zeeman splitting weakly depends on the optical pumping (its variation does not exceed 15% of the splitting in a field of 12 T). The estimation of the exciton density in the reservoir based on these data gives a value lower than 108 cm–2. In addition, a noticeable decrease (by a factor of about 1.8) in the polariton condensation threshold in a magnetic field is detected.
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Original Russian Text © A.S. Brichkin, S.I. Novikov, A.V. Chernenko, C. Schneider, S. Hoefling, 2017, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2017, Vol. 151, No. 5, pp. 883–890.
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Brichkin, A.S., Novikov, S.I., Chernenko, A.V. et al. Investigation of a nonequilibrium polariton condensate in cylindrical micropillars in a strong magnetic field. J. Exp. Theor. Phys. 124, 751–757 (2017). https://doi.org/10.1134/S1063776117040021
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DOI: https://doi.org/10.1134/S1063776117040021