Infrared ellipsometry study of the confined electrons in a high-mobility gamma-Al2O3/SrTiO3 heterostructure
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F16%3A00093796" target="_blank" >RIV/00216224:14310/16:00093796 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1209/0295-5075/113/47005" target="_blank" >http://dx.doi.org/10.1209/0295-5075/113/47005</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1209/0295-5075/113/47005" target="_blank" >10.1209/0295-5075/113/47005</a>
Alternative languages
Result language
angličtina
Original language name
Infrared ellipsometry study of the confined electrons in a high-mobility gamma-Al2O3/SrTiO3 heterostructure
Original language description
With infrared ellipsometry we studied the response of the confined electrons in gamma-Al2O3/SrTiO3 (GAO/STO) heterostructures in which they originate predominantly from oxygen vacancies. From the analysis of a so-called Berreman mode, that develops near the highest longitudinal optical phonon mode of SrTiO3, we derive the sheet carrier density, N-s, the mobility, mu, and the depth profile of the carrier concentration. Notably, we find that N-s and the shape of the depth profile are similar as in LaAlO3/SrTiO3 (LAO/STO) heterostructures for which the itinerant carriers are believed to arise from a polar discontinuity. Despite an order of magnitude higher mobility in GAO/STO, as obtained from transport measurements, the derived mobility in the infrared range exhibits only a twofold increase. We interpret this finding in terms of the polaronic nature of the confined charge carriers in GAO/STO and LAO/STO which leads to a strong, frequency-dependent interaction with the STO phonons.
Czech name
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Czech description
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Classification
Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BM - Solid-state physics and magnetism
OECD FORD branch
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Result continuities
Project
<a href="/en/project/ED1.1.00%2F02.0068" target="_blank" >ED1.1.00/02.0068: Central european institute of technology</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
EPL
ISSN
0295-5075
e-ISSN
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Volume of the periodical
113
Issue of the periodical within the volume
4
Country of publishing house
FR - FRANCE
Number of pages
6
Pages from-to
"nestrankovano"
UT code for WoS article
000372420000021
EID of the result in the Scopus database
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