Investigation of a nonequilibrium polariton condensate in cylindrical micropillars in a strong magnetic field
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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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- 5.V. D. Kulakovskii, A. V. Larionov, S. Brichkin, C. Schneider, S. Hoefling, M. Kamp, A. Forchel, and N. A. Gippius, in Proceedings of the 20th International Conference on High Magnetic Fields in Semiconductor, HMF-20, Chamonix Mont-Blanc, France, July 22–27, 2012.Google Scholar
- 14.A. Kavokin, J. J. Baumberg, G. Malpuech, and F. P. Laussy, Microcavities (Clarendon, Oxford, 2006).Google Scholar