Abstract
The dependence of the quasiparticle Fermi energy on the electron density is investigated by analyzing the radiative recombination spectra of two-dimensional electrons with photoexcited holes bound at remote acceptors. In this way, the electron-density dependence of the renormalized mass of quasiparticles is determined. It is established that, as the electron density decreases (the parameter r s increases to 4.5), the density-of-states effective mass of quasiparticles increases by 35% as compared to the cyclotron mass of the electron. It is shown that, in a perpendicular magnetic field, the concept of quasiparticles in a two-dimensional Fermi liquid is applicable not only near the Fermi level but also deeply below the Fermi surface, even to the bottom of the quantum-confinement subband, because the broadening of excitations remains considerably smaller than their energy.
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Original Russian Text © I.V. Kukushkin, S. Schmult, 2015, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2015, Vol. 101, No. 10, pp. 770–776.
In memory of V.F. Gantmakher
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Kukushkin, I.V., Schmult, S. Fermi liquid effects and quasiparticle mass renormalization in a system of two-dimensional electrons with strong interaction. Jetp Lett. 101, 693–698 (2015). https://doi.org/10.1134/S0021364015100082
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DOI: https://doi.org/10.1134/S0021364015100082