PMID- 29995384
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20191120
IS  - 1936-086X (Electronic)
IS  - 1936-0851 (Linking)
VI  - 12
IP  - 8
DP  - 2018 Aug 28
TI  - Orbital Ordering of the Mobile and Localized Electrons at Oxygen-Deficient 
      LaAlO(3)/SrTiO(3) Interfaces.
PG  - 7927-7935
LID - 10.1021/acsnano.8b02335 [doi]
AB  - Interfacing different transition-metal oxides opens a route to functionalizing 
      their rich interplay of electron, spin, orbital, and lattice degrees of freedom 
      for electronic and spintronic devices. Electronic and magnetic properties of 
      SrTiO(3)-based interfaces hosting a mobile two-dimensional electron system (2DES) 
      are strongly influenced by oxygen vacancies, which form an electronic dichotomy, 
      where strongly correlated localized electrons in the in-gap states (IGSs) coexist 
      with noncorrelated delocalized 2DES. Here, we use resonant soft-X-ray 
      photoelectron spectroscopy to prove the e(g) character of the IGSs, as opposed to 
      the t(2g) character of the 2DES in the paradigmatic LaAlO(3)/SrTiO(3) interface. 
      We furthermore separate the d (xy) and d (xz)/d (xz) orbital contributions based 
      on deeper consideration of the resonant photoexcitation process in terms of 
      orbital and momentum selectivity. Supported by a self-consistent combination of 
      density functional theory and dynamical mean field theory calculations, this 
      experiment identifies local orbital reconstruction that goes beyond the 
      conventional e(g)- vs-t(2g) band ordering. A hallmark of oxygen-deficient 
      LaAlO(3)/SrTiO(3) is a significant hybridization of the e(g) and t(2g) orbitals. 
      Our findings provide routes for tuning the electronic and magnetic properties of 
      oxide interfaces through "defect engineering" with oxygen vacancies.
FAU - Chikina, Alla
AU  - Chikina A
AUID- ORCID: 0000-0003-3635-6503
AD  - Swiss Light Source, Paul Scherrer Institute , Villigen CH-5232 , Switzerland.
FAU - Lechermann, Frank
AU  - Lechermann F
AD  - Institut fur Theoretische Physik , Universitat Hamburg , Jungiusstrasse 9 , 
      Hamburg DE-20355 , Germany.
FAU - Husanu, Marius-Adrian
AU  - Husanu MA
AD  - Swiss Light Source, Paul Scherrer Institute , Villigen CH-5232 , Switzerland.
AD  - National Institute of Materials Physics , Atomistilor 405A , Magurele RO-077125 , 
      Romania.
FAU - Caputo, Marco
AU  - Caputo M
AD  - Swiss Light Source, Paul Scherrer Institute , Villigen CH-5232 , Switzerland.
FAU - Cancellieri, Claudia
AU  - Cancellieri C
AUID- ORCID: 0000-0003-4124-4362
AD  - Swiss Light Source, Paul Scherrer Institute , Villigen CH-5232 , Switzerland.
AD  - Empa, Swiss Federal Laboratories for Materials Science & Technology , 
      Ueberlandstrasse 129 , Duebendorf CH-8600 , Switzerland.
FAU - Wang, Xiaoqiang
AU  - Wang X
AD  - Swiss Light Source, Paul Scherrer Institute , Villigen CH-5232 , Switzerland.
FAU - Schmitt, Thorsten
AU  - Schmitt T
AD  - Swiss Light Source, Paul Scherrer Institute , Villigen CH-5232 , Switzerland.
FAU - Radovic, Milan
AU  - Radovic M
AD  - Swiss Light Source, Paul Scherrer Institute , Villigen CH-5232 , Switzerland.
FAU - Strocov, Vladimir N
AU  - Strocov VN
AD  - Swiss Light Source, Paul Scherrer Institute , Villigen CH-5232 , Switzerland.
LA  - eng
PT  - Journal Article
DEP - 20180717
PL  - United States
TA  - ACS Nano
JT  - ACS nano
JID - 101313589
OTO - NOTNLM
OT  - LaAlO3/SrTiO3 interface
OT  - oxide interfaces
OT  - oxygen vacancies
OT  - resonant photoemission
OT  - two-dimensional electron gas
EDAT- 2018/07/12 06:00
MHDA- 2018/07/12 06:01
CRDT- 2018/07/12 06:00
PHST- 2018/07/12 06:00 [pubmed]
PHST- 2018/07/12 06:01 [medline]
PHST- 2018/07/12 06:00 [entrez]
AID - 10.1021/acsnano.8b02335 [doi]
PST - ppublish
SO  - ACS Nano. 2018 Aug 28;12(8):7927-7935. doi: 10.1021/acsnano.8b02335. Epub 2018 
      Jul 17.