Infrared ellipsometry study of the confined electrons in a
high-mobility gamma-Al2O3/SrTiO3 heterostructure

J 2016

Infrared ellipsometry study of the confined electrons in a high-mobility gamma-Al2O3/SrTiO3 heterostructure

YAZDI-RIZI, M.; Přemysl MARŠÍK; B. P. P. MALLETT; Adam DUBROKA; D. V. CHRISTENSEN et. al.

Základní údaje

Originální název

Infrared ellipsometry study of the confined electrons in a high-mobility gamma-Al2O3/SrTiO3 heterostructure

Autoři

YAZDI-RIZI, M. (364 Írán); Přemysl MARŠÍK (203 Česká republika); B. P. P. MALLETT (554 Nový Zéland); Adam DUBROKA (203 Česká republika, garant, domácí); D. V. CHRISTENSEN (208 Dánsko); Y. Z. CHEN (156 Čína); N. PRYDS (208 Dánsko) a Christian BERNHARD (276 Německo)

Vydání

EPL, MULHOUSE, EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY, 2016, 0295-5075

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10302 Condensed matter physics

Stát vydavatele

Francie

Utajení

není předmětem státního či obchodního tajemství

Impakt faktor

Impact factor: 1.957

Kód RIV

RIV/00216224:14310/16:00093796

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1209/0295-5075/113/47005

UT WoS

000372420000021

EID Scopus

2-s2.0-84961707887

Klíčová slova anglicky

nfrared ellipsometry; Al2O3/SrTiO3 heterostructure

Štítky

AKR, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 13. 3. 2018 16:10, doc. Mgr. Adam Dubroka, Ph.D.

Anotace

V originále

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. Copyright (C) EPLA, 2016

Návaznosti

ED1.1.00/02.0068, projekt VaV

Název: CEITEC - central european institute of technology

Citovat

YAZDI-RIZI, M.; Přemysl MARŠÍK; B. P. P. MALLETT; Adam DUBROKA; D. V. CHRISTENSEN; Y. Z. CHEN; N. PRYDS a Christian BERNHARD. Infrared ellipsometry study of the confined electrons in a high-mobility gamma-Al2O3/SrTiO3 heterostructure. EPL. MULHOUSE: EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY, 2016, roč. 113, č. 4, s. "nestrankovano", 6 s. ISSN 0295-5075. Dostupné z: https://dx.doi.org/10.1209/0295-5075/113/47005.

@article{1374452,
   author = {YazdiandRizi, M. and Maršík, Přemysl and Mallett, B. P. P. and Dubroka, Adam and Christensen, D. V. and Chen, Y. Z. and Pryds, N. and Bernhard, Christian},
   article_location = {MULHOUSE},
   article_number = {4},
   doi = {http://dx.doi.org/10.1209/0295-5075/113/47005},
   keywords = {nfrared ellipsometry; Al2O3/SrTiO3 heterostructure},
   language = {eng},
   issn = {0295-5075},
   journal = {EPL},
   title = {Infrared ellipsometry study of the confined electrons in a high-mobility gamma-Al2O3/SrTiO3 heterostructure},
   volume = {113},
   year = {2016}
}

TY  - JOUR
ID  - 1374452
AU  - Yazdi-Rizi, M. - Maršík, Přemysl - Mallett, B. P. P. - Dubroka, Adam - Christensen, D. V. - Chen, Y. Z. - Pryds, N. - Bernhard, Christian
PY  - 2016
TI  - Infrared ellipsometry study of the confined electrons in a high-mobility gamma-Al2O3/SrTiO3 heterostructure
JF  - EPL
VL  - 113
IS  - 4
SP  - "nestrankovano"
EP  - "nestrankovano"
PB  - EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY
SN  - 02955075
KW  - nfrared ellipsometry
KW  - Al2O3/SrTiO3 heterostructure
N2  - 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. Copyright (C) EPLA, 2016
ER  -

YAZDI-RIZI, M.; Přemysl MARŠÍK; B. P. P. MALLETT; Adam DUBROKA; D. V. CHRISTENSEN; Y. Z. CHEN; N. PRYDS a Christian BERNHARD. Infrared ellipsometry study of the confined electrons in a high-mobility gamma-Al2O3/SrTiO3 heterostructure. \textit{EPL}. MULHOUSE: EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY, 2016, roč.~113, č.~4, s.~''nestrankovano'', 6 s. ISSN~0295-5075. Dostupné z: https://dx.doi.org/10.1209/0295-5075/113/47005.

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