Nanoscale modulation of the density of states at the conducting interface between LaAlO3 and SrTiO3 band insulators

@article{ ISI:000287024300020,
Author = {Ristic, Z. and Di Capua, R. and De Luca, G. M. and Chiarella, F. and
   Ghiringhelli, G. and Cezar, J. C. and Brookes, N. B. and Richter, C. and
   Mannhart, J. and Salluzzo, M.},
Title = {{Nanoscale modulation of the density of states at the conducting
   interface between LaAlO3 and SrTiO3 band insulators}},
Journal = {{EPL}},
Year = {{2011}},
Volume = {{93}},
Number = {{1}},
Month = {{JAN}},
Abstract = {{The appearance of high-mobility electrons at the LaAlO3/SrTiO3 interface
   has raised strong interest in the material science community and a
   lively debate on the origin of the phenomenon. A possible explanation is
   an electronic reconstruction, realizing a transfer of electrons to
   SrTiO3 at the interface, thereby avoiding the build-up of excessive
   Coulomb energy as described by the ``polarization catastrophe{''}
   associated with the alternating polar layers of the LaAlO3 film.
   Theoretical models predict that electrons are transferred into titanium
   3d(xy) interface states and, in the presence of strong correlations,
   generate a charge and orbital order. Here we provide experimental
   evidence that at room temperature the local density of states of the
   LaAlO3/SrTiO3 conducting interface is modulated at the nanoscale in a
   short-range quasiperiodic pattern, which is consistent with the
   appearance of an orbital (short-range) order. This result, together with
   the splitting of the 3d states, confirms that an electronic
   reconstruction drives the functional properties of the LaAlO3/SrTiO3
   oxide interface. The short-range superstructure does not fully agree
   with the theoretical predictions. Thus, further experimental and
   theoretical investigations are required to understand the electronic
   properties of the 2D electron system realised at the LaAlO3/SrTiO3
   interface. Copyright (C) EPLA, 2011}},
Publisher = {{EPL ASSOCIATION, EUROPEAN PHYSICAL SOCIETY}},
Address = {{6 RUE DES FRERES LUMIERE, MULHOUSE, 68200, FRANCE}},
Type = {{Article}},
Language = {{English}},
Affiliation = {{Ristic, Z (Corresponding Author), CNR SPIN, Complesso MonteSantangelo,Via Cinthia, I-80126 Naples, Italy.
   Ristic, Z.; Di Capua, R.; De Luca, G. M.; Chiarella, F.; Salluzzo, M., CNR SPIN, I-80126 Naples, Italy.
   Di Capua, R., Univ Molise, Dipartimento SpeS, I-86100 Campobasso, Italy.
   Ghiringhelli, G., Politecn Milan, CNR SPIN, I-20133 Milan, Italy.
   Ghiringhelli, G., Politecn Milan, Dipartimento Fis, I-20133 Milan, Italy.
   Cezar, J. C.; Brookes, N. B., European Synchrotron Radiat Facil, F-38043 Grenoble, France.
   Richter, C.; Mannhart, J., Univ Augsburg, Ctr Elect Correlat & Magnetism, Inst Phys, D-86135 Augsburg, Germany.}},
DOI = {{10.1209/0295-5075/93/17004}},
Article-Number = {{17004}},
ISSN = {{0295-5075}},
Keywords-Plus = {{ELECTRONIC-STRUCTURE; RECONSTRUCTION}},
Research-Areas = {{Physics}},
Web-of-Science-Categories  = {{Physics, Multidisciplinary}},
Author-Email = {{salluzzo@na.infn.it}},
ResearcherID-Numbers = {{Ristic, Zoran/AAQ-6890-2020
   Di Capua, Roberto/G-9622-2012
   Criginski Cezar, Julio/B-2731-2008
   Cezar, Julio Criginski/D-5039-2012
   salluzzo, marco/C-5919-2009
   Brookes, Nicholas B/C-6718-2019
   Richter, Christoph/A-6172-2013
   Chiarella, Fabio/G-2739-2015
   Ghiringhelli, Giacomo/D-1159-2014
   }},
ORCID-Numbers = {{Ristic, Zoran/0000-0002-1854-284X
   Di Capua, Roberto/0000-0003-3605-0993
   Cezar, Julio Criginski/0000-0002-7904-6874
   salluzzo, marco/0000-0001-8372-6963
   Brookes, Nicholas B/0000-0002-1342-9530
   Richter, Christoph/0000-0002-6591-1118
   Chiarella, Fabio/0000-0003-2537-5282
   Ghiringhelli, Giacomo/0000-0003-0867-7748
   Mannhart, Jochen/0000-0001-6331-2640}},
Funding-Acknowledgement = {{DFGGerman Research Foundation (DFG) {[}TRR 80]; EUEuropean Union (EU)}},
Funding-Text = {{The authors are grateful to A. BARONE, M. BREITSCHAFT, S. DI MATTEO, I.
   MAGGIO-APRILE, J.-M. TRISCONE, and R. VAGLIO for useful discussions.
   Financial support by the DFG (TRR 80) and the EU (oxIDes) is gratefully
   acknowledged.}},
Number-of-Cited-References = {{25}},
Times-Cited = {{16}},
Usage-Count-Last-180-days = {{0}},
Usage-Count-Since-2013 = {{11}},
Journal-ISO = {{EPL}},
Doc-Delivery-Number = {{717DU}},
Unique-ID = {{ISI:000287024300020}},
DA = {{2020-12-22}},
}