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arXiv · 1805.09538

Renormalization of the conduction band spectrum in HgTe quantum wells by electron-electron interaction

G. M. Minkov·V. Ya. Aleshkin·O. E. Rut·A. A. Sherstobitov·A. V. Germanenko·S. A. Dvoretski·N. N. Mikhailov
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Abstract

The energy spectrum of the conduction band in HgTe/Cd$_x$Hg$_{1-x}$Te quantum wells of a width $d=(4.6-20.2)$ nm has been experimentally studied in a wide range of electron density. For this purpose, the electron density dependence of the effective mass was measured by two methods: by analyzing the temperature dependence of the Shubnikov-de Haas oscillations and by means of the quantum capacitance measurements. There was shown that the effective mass obtained for the structures with $d (7-8)$ nm, the experimental effective mass becomes noticeably less than the calculated ones. This difference increases with the electron density decrease, i.e., with lowering the Fermi energy; the maximal difference between the theory and experiment is achieved at $d = (15-18)$ nm, where the ratio between the calculated and experimental masses reaches the value of two and begins to decrease with a further $d$ increase. We assume that observed behavior of the electron effective mass results from the spectrum renormalization due to electron-electron interaction.

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G. M. Minkov, V. Ya. Aleshkin, O. E. Rut, A. A. Sherstobitov, A. V. Germanenko, S. A. Dvoretski, N. N. Mikhailov. 2018-05-24. Renormalization of the conduction band spectrum in HgTe quantum wells by electron-electron interaction. https://doi.org/10.1016/j.physe.2019.113742

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