Landau level spectroscopy of valence bands in HgTe quantum wells: Effects of symmetry lowering

L. S. Bovkun, A. V. Ikonnikov, V. Ya Aleshkin, K. E. Spirin, V. I. Gavrilenko, N. N. Mikhailov, S. A. Dvoretskii, F. Teppe, B. A. Piot, M. Potemski, M. Orlita

Результат исследования: Научные публикации в периодических изданияхстатья

4 Цитирования (Scopus)

Аннотация

The Landau level spectroscopy technique has been used to explore the electronic structure of the valence band in a series of p-type HgTe/HgCdTe quantum wells with both normal and inverted ordering of bands. We find that the standard axial-symmetric 4-band Kane model, which is nowadays widely applied in physics of HgTe-based topological materials, does not fully account for the complex magneto-optical response observed in our experiments - notably, for the unexpected avoided crossings of excitations and for the appearance of transitions that are electric-dipole forbidden within this model. Nevertheless, reasonable agreement with experiments is achieved when the standard model is expanded to include effects of bulk and interface inversion asymmetries. These remove the axial symmetry, and among other, profoundly modify the shape of valence bands.

Язык оригиналаанглийский
Номер статьи145501
Страницы (с-по)145501
Число страниц13
ЖурналJournal of Physics Condensed Matter
Том31
Номер выпуска14
DOI
СостояниеОпубликовано - 10 апр 2019

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