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Macrofilling of the Magnetoexciton Level in the Quantum-Hall-Effect Regime

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Abstract

The formation of long-lived spin magnetoexcitons is found in strongly interacting two-dimensional electronic systems. Measurements are carried out using the method of resonant inelastic light scattering on ZnO/MgZnO samples in the quantum-Hall-effect regime. Macrofilling of the long-lived excitation level is detected on the base of the giant anti-Stokes component of inelastic light scattering at a spin exciton under conditions of a ferromagnetic phase transition at a filling factor of 2. At a temperature of about 0.35 K, the intensity of this spectral line is more than 11 orders of magnitude higher than the intensity expected due to the thermal activation of spin excitons. The conclusion about the existence of long-lived excitations is made based on analysis of the anti-Stokes scattering data obtained at different pump powers and temperatures of the system. The formation of long-lived excitations is presumably the consequence of a modification in the spin-exciton dispersion law under phase-transition conditions.

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Funding

This work was supported by the Russian Foundation for Basic Research (project no. 19-32-90203).

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Authors and Affiliations

  1. Institute of Solid State Physics, Russian Academy of Sciences, 142432, Chernogolovka, Russia

    B. D. Kaysin

  2. Moscow Institute of Physics and Technology, 141700, Dolgoprudny, Russia

    B. D. Kaysin

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  1. B. D. Kaysin
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Correspondence to B. D. Kaysin.

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Translated by Yu. Ryzhkov

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Kaysin, B.D. Macrofilling of the Magnetoexciton Level in the Quantum-Hall-Effect Regime. J. Surf. Investig. 16, 457–461 (2022). https://doi.org/10.1134/S1027451022040085

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  • DOI: https://doi.org/10.1134/S1027451022040085

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