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- Title
Magnetospectroscopy of double HgTe/CdHgTe quantum wells.
- Authors
Bovkun, L.; Krishtopenko, S.; Ikonnikov, A.; Aleshkin, V.; Kadykov, A.; Ruffenach, S.; Consejo, C.; Teppe, F.; Knap, W.; Orlita, M.; Piot, B.; Potemski, M.; Mikhailov, N.; Dvoretskii, S.; Gavrilenko, V.
- Abstract
The magnetoabsorption spectra in double HgTe/CdHgTe quantum wells (QWs) with normal and inverted band structures are investigated. The Landau levels in symmetric QWs with a rectangular potential profile are calculated based on the Kane 8 × 8 model. The presence of a tunnel-transparent barrier is shown to lead to the splitting of states and 'doubling' of the main magnetoabsorption lines. At a QW width close to the critical one the presence of band inversion and the emergence of a gapless band structure, similar to bilayer graphene, are shown for a structure with a single QW. The shift of magnetoabsorption lines as the carrier concentration changes due to the persistent photoconductivity effect associated with a change in the potential profile because of trap charge exchange is detected. This opens up the possibility for controlling topological phase transitions in such structures.
- Subjects
MERCURY telluride; MAGNETO-absorption; LANDAU levels; PHOTOCONDUCTIVITY; CHARGE exchange
- Publication
Semiconductors, 2016, Vol 50, Issue 11, p1532
- ISSN
1063-7826
- Publication type
Article
- DOI
10.1134/S1063782616110063