Article (Scientific journals)
The origin of two-dimensional electron gases at oxide interfaces: insights from theory
Bristowe, Nicholas; Ghosez, Philippe; Littlewood, P.B. et al.
2014In Journal of Physics: Condensed Matter, 26, p. 143201
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Keywords :
oxide interfaces and surfaces; polar discontinuity; two-dimensional electron gas
Abstract :
[en] The response of oxide thin films to polar discontinuities at interfaces and surfaces has generated enormous activity due to the variety of interesting effects that it gives rise to. A case in point is the discovery of the electron gas at the interface between LaAlO3 and SrTiO3, which has since been shown to be quasi-two-dimensional, switchable, magnetic and/or superconducting. Despite these findings, the origin of the two-dimensional electron gas is highly debated and several possible mechanisms remain. Here we review the main proposed mechanisms and attempt to model expected effects in a quantitative way with the ambition of better constraining what effects can/cannot explain the observed phenomenology. We do it in the framework of a phenomenological model constructed to provide an understanding of the electronic and/or redox screening of the chemical charge in oxide heterostructures. We also discuss the effect of intermixing, both conserving and not conserving the total stoichiometry.
Disciplines :
Physics
Author, co-author :
Bristowe, Nicholas ;  Université de Liège - ULiège > Département de physique > Physique théorique des matériaux
Ghosez, Philippe  ;  Université de Liège - ULiège > Département de physique > Physique théorique des matériaux
Littlewood, P.B.
Artacho, E.
Language :
English
Title :
The origin of two-dimensional electron gases at oxide interfaces: insights from theory
Publication date :
2014
Journal title :
Journal of Physics: Condensed Matter
ISSN :
0953-8984
eISSN :
1361-648X
Publisher :
Institute of Physics, Bristol, United Kingdom
Volume :
26
Pages :
143201
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 09 July 2014

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