Transmission Spectra of HgTe-Based Quantum Wells and Films in the Far-Infrared Range

Strained 80-nm-thick HgTe films belong to a new class of materials referred to as three-dimensional topological insulators (i.e., they have a bulk band gap and spin-nondegenerate surface states). Though there are a number of studies devoted to analysis of the properties of surface states using both...

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Published inPhysics of the solid state Vol. 60; no. 4; pp. 778 - 782
Main Authors Savchenko, M. L., Vasil’ev, N. N., Yaroshevich, A. S., Kozlov, D. A., Kvon, Z. D., Mikhailov, N. N., Dvoretskii, S. A.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.04.2018
Springer
Springer Nature B.V
Subjects
ABSORPTION
Analysis
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
ENERGY-LEVEL TRANSITIONS
FAR INFRARED RADIATION
Magnetic properties
MERCURY TELLURIDES
Optical Properties
PHONONS
Physics
Physics and Astronomy
QUANTUM WELLS
REFLECTION
Solid State Physics
SPECTRA
SPIN
STRAINS
SURFACES
Thick films
THICKNESS
THIN FILMS
THREE-DIMENSIONAL CALCULATIONS
Topological insulators
TRANSMISSION
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Summary:Strained 80-nm-thick HgTe films belong to a new class of materials referred to as three-dimensional topological insulators (i.e., they have a bulk band gap and spin-nondegenerate surface states). Though there are a number of studies devoted to analysis of the properties of surface states using both transport and magnetooptical techniques in the THz range, the information about direct optical transitions between bulk and surface bands in these systems has not been reported. This study is devoted to the analysis of transmission and reflection spectra of HgTe films of different thicknesses in the far-infrared range recorded in a wide temperature range in order to detect the above interband transitions. A peculiarity at 15 meV, which is sensitive to a change in the temperature, is observed in spectra of both types. Detailed analysis of the data obtained revealed that this feature is related to absorption by HgTe optical phonons, while the interband optical transitions are suppressed.
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783418040285