The coherent properties of a dense ensemble of triplet cyclotron magnetoexcitons in a quantum Hall insulator near the filling factor \(\nu = 2\) have been studied using shear interferometry methods. It has been found that a condensate of magnetoexcitons formed at fairly low temperatures by means of nonresonant photoexcitation has a higher degree of coherence compared to the gas of uncondensed magnetoexcitons: the transverse length of coherence reaches about 10 μm. The condensate can include up to 20% of all triplet magnetoexcitons.
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ACKNOWLEDGMENTS
We are grateful to A.A. Demenev and A.S. Zhuravlev for assistance in the development and debugging of the experimental technique and V.D. Kulakovskii for stimulating discussions of the results.
Funding
This work was supported by the Russian Science Foundation (project no. 21-12-00368).
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Translated by R. Tyapaev
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Gorbunov, A.V., Larionov, A.V., Kulik, L.V. et al. Coherence of a Magnetoexciton Condensate in a Quantum Hall Insulator. Jetp Lett. 114, 417–422 (2021). https://doi.org/10.1134/S0021364021190073
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DOI: https://doi.org/10.1134/S0021364021190073