Magnetospectroscopy of double HgTe/CdHgTe quantum wells Auteur(s): Bovkun L. S., Krishtopenko S., Ikonnikov A. V., Aleshkin V. Ya., Kadykov A., Ruffenach S., Consejo C., Teppe F., Knap W., Orlita M., Piot B., Potemski M., Mikhailov N. N., Dvoretskii S. A., Gavrilenko V. I.
Conference: XX International Symposium “Nanophysics and Nanoelectronics” (Nizhny Novgorod, RU, 2016-03-14) Ref HAL: hal-01406356_v1 DOI: 10.1134/S1063782616110063 WoS: WOS:000387363900022 Exporter : BibTex | endNote 5 Citations Résumé: 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. |