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

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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