## Аннотация

The energy spectrum of the conduction band in HgTe/Cd_{x}Hg_{1−x}Te 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<d_{c}, where d_{c}≃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 оригинала | английский |
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Номер статьи | 113742 |

Число страниц | 8 |

Журнал | Physica E: Low-Dimensional Systems and Nanostructures |

Том | 116 |

DOI | |

Состояние | Опубликовано - февр. 2020 |

## Предметные области OECD FOS+WOS

- 1.03 ФИЗИЧЕСКИЕ НАУКИ И АСТРОНОМИЯ