Electron mass in a HgTe quantum well: Experiment versus theory

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

Результат исследования: Научные публикации в периодических изданияхстатья

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The energy spectrum of the conduction band in HgTe/CdxHg1−xTe quantum wells with 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<dc, where dc≃6.3nm is a critical width of quantum well corresponding to the Dirac-like energy spectrum, is close to the calculated values over the whole electron density range; with increasing width, at 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 many-body effects.

Язык оригиналаанглийский
Номер статьи113742
Число страниц8
ЖурналPhysica E: Low-Dimensional Systems and Nanostructures
СостояниеОпубликовано - фев 2020

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    Minkov, G. M., Aleshkin, V. Y., Rut, O. E., Sherstobitov, A. A., Germanenko, A. V., Dvoretski, S. A., & Mikhailov, N. N. (2020). Electron mass in a HgTe quantum well: Experiment versus theory. Physica E: Low-Dimensional Systems and Nanostructures, 116, [113742]. https://doi.org/10.1016/j.physe.2019.113742