Electronic band structure vs intrinsic antisite doping in the MBE grown films MnTe · Bi(2-x)Te3(1-x/2) (0 ≥ x < 2): Evidence from spectroscopic ellipsometry and infrared studies
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F24%3A00603632" target="_blank" >RIV/68378271:_____/24:00603632 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1063/5.0238665" target="_blank" >https://doi.org/10.1063/5.0238665</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1063/5.0238665" target="_blank" >10.1063/5.0238665</a>
Alternative languages
Result language
angličtina
Original language name
Electronic band structure vs intrinsic antisite doping in the MBE grown films MnTe · Bi(2-x)Te3(1-x/2) (0 ≥ x < 2): Evidence from spectroscopic ellipsometry and infrared studies
Original language description
Intrinsic antisite defects influence the electronic and magnetic properties of antiferromagnetic topological insulators in the MnTe-Bi2Te3 family. These defects affect the position of the Fermi level and hinder the exploration of Dirac states. In this study, films with varying compositions of Bi and Te, ranging from MnTe to MnBi2Te4, were grown using molecular beam epitaxy on silicon substrates. The optical properties of these films were investigated using spectroscopic ellipsometry in the energy range of 0.5 to 6.5 electron volts, along with infrared reflectance and transmittance measurements. The analysis of optical spectra revealed that as the Bi and Te content increased, the dielectric function changed significantly. The imaginary part of the dielectric function showed a shift in its peak towards lower photon energies, which is characteristic of the final composition. Additionally, the stoichiometric MnBi2Te4 film exhibited an optical response associated with intrinsic antisite doping in the far-infrared range. However, in films with lower Bi and Te concentrations, the contribution from charge carriers was reduced. These changes in optical properties highlight the role of stoichiometry in controlling the electronic band structure and optical spectral weight distribution.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10306 - Optics (including laser optics and quantum optics)
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Applied Physics Letters
ISSN
0003-6951
e-ISSN
1077-3118
Volume of the periodical
125
Issue of the periodical within the volume
26
Country of publishing house
US - UNITED STATES
Number of pages
8
Pages from-to
262404
UT code for WoS article
001386148900016
EID of the result in the Scopus database
2-s2.0-85213061977