Spectroscopy of Temperature-Driven Single Valley Dirac Fermions in HgTe/CdHgTe Quantum Wells

We report on the temperature-dependent magneto-absorption and magnetotransport spectroscopy of HgTe/CdHgTe quantum wells above the critical well thickness d c . Our results, obtained in magnetic fields up to 16 T and temperature range from 1.7 to 150 K, clearly indicate a change in the band-gap ener...

Full description

Saved in:
Bibliographic Details
Main Authors: Kadvkov, A.M., Krishtopenko, S.S., Jouault, B., Desrat, W., Marcinkiewicz, M., Ruffenach, S., Consejo, C., Torres, J., Morozov, S.V., Gavrilenko, V.I., Mikhailov, N.N., Dvoretskii, S.A., Knap, W., Teppe, F.
Format: Conference Proceeding
Language:English
Subjects:
II-VI semiconductor materials
Magnetic fields
Spectroscopy
Temperature distribution
Temperature measurement
Two dimensional displays
Online Access:Request full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We report on the temperature-dependent magneto-absorption and magnetotransport spectroscopy of HgTe/CdHgTe quantum wells above the critical well thickness d c . Our results, obtained in magnetic fields up to 16 T and temperature range from 1.7 to 150 K, clearly indicate a change in the band-gap energy with temperature. A topological phase transition between quantum spin Hall and trivial insulator states, revealing appearance of single-valley Dirac fermions at T= 27 and 90 K for 6.5 and 8 nm QWs respectively, was clearly observed in our magnetospectroscopy measurements.
ISSN:2162-2035
DOI:10.1109/IRMMW-THz.2018.8510039