[en] Polar discontinuities occurring at interfaces between two materials constitute both a challenge and an opportunity in the study and application of a variety of devices. In order to cure the large electric field occurring in such struc- tures, a reconfiguration of the charge landscape sets in at the interface via chemical modifications, adsorbates, or charge transfer. In the latter case,
one may expect a local electronic doping of one material: one example is the two-dimensional electron liquid (2DEL) appearing in SrTiO3 once covered by
a polar LaAlO3 layer. Here, it is shown that tuning the formal polarization of
a (La,Al)1−x(Sr,Ti)xO3 (LASTO:x) overlayer modifies the quantum confinement
of the 2DEL in SrTiO3 and its electronic band structure. The analysis of the behavior in magnetic field of superconducting field-effect devices reveals, in agreement with ab initio calculations and self-consistent Poisson–Schrödinger modeling, that quantum confinement and energy splitting between electronic bands of different symmetries strongly depend on the interface total charge densities. These results strongly support the polar discontinuity mechanisms with a full charge transfer to explain the origin of the 2DEL at the celebrated LaAlO3/SrTiO3 interface and demonstrate an effective tool for tailoring the elec- tronic structure at oxide interfaces.
Research Center/Unit :
CESAM - Complex and Entangled Systems from Atoms to Materials - ULiège
Disciplines :
Physics
Author, co-author :
Li, Danfeng; Université de Genève - UNIGE > Department of Quantum Matter Physics
Lemal, Sébastien ; Université de Liège - ULiège > Département de physique > Physique théorique des matériaux
Gariglio, Stefano; Université de Genève - UNIGE > Department of Quantum Matter Physics
Wu, Zhenping; Beijing University of Posts and Telecommunications > State Key Laboratory of Information Photonics and Optical Communications and School of Science
Fête, Alexandre; Université de Genève - UNIGE > Department of Quantum Matter Physics
Boselli, Margherita; Université de Genève - UNIGE > Department of Quantum Matter Physics
Ghosez, Philippe ; Université de Liège - ULiège > Département de physique > Physique théorique des matériaux
Triscone, Jean-Marc; Université de Genève - UNIGE > Department of Quantum Matter Physics
Language :
English
Title :
Probing Quantum Confinement and Electronic Structure at Polar Oxide Interfaces
Publication date :
2018
Journal title :
Advanced Science
ISSN :
2198-3844
Publisher :
Wiley
Volume :
5
Pages :
1800242
Peer reviewed :
Peer Reviewed verified by ORBi
Tags :
Tier-1 supercomputer CÉCI : Consortium des Équipements de Calcul Intensif
scite shows how a scientific paper has been cited by providing the context of the citation, a classification describing whether it supports, mentions, or contrasts the cited claim, and a label indicating in which section the citation was made.
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