Symmetry breaking at the (111) interfaces of SrTiO3 hosting a two-dimensional electron system

@article{ ISI:000445507000003,
Author = {De Luca, G. M. and Di Capua, R. and Di Gennaro, E. and Sambri, A. and
   Granozio, F. Miletto and Ghiringhelli, G. and Betto, D. and Piamonteze,
   C. and Brookes, N. B. and Salluzzo, M.},
Title = {{Symmetry breaking at the (111) interfaces of SrTiO3 hosting a
   two-dimensional electron system}},
Journal = {{PHYSICAL REVIEW B}},
Year = {{2018}},
Volume = {{98}},
Number = {{11}},
Month = {{SEP 24}},
Abstract = {{We used x-ray absorption spectroscopy to study the orbital symmetry and
   the energy band splitting of (111) LaAlO3/SrTiO3 and
   LaAlO3/EuTiO3/SrTiO3 heterostructures, hosting a quasi-two-dimensional
   electron system (q2DES), and of a Ti-terminated (111) SrTiO3 single
   crystal, also known to form a q2DES at its surface. We demonstrate that
   the bulk tetragonal Ti-3d D-4h crystal field is turned into a trigonal
   D-3d crystal field in all cases. The symmetry adapted a(1g) and e(g)(pi)
   orbitals are nondegenerate in energy and their splitting Delta is
   positive at the bare STO surface but negative in the heterostructures,
   where the a(1g) orbital is lowest in energy. These results demonstrate
   that the interfacial symmetry breaking induced by epitaxial engineering
   of oxide interfaces has a dramatic effect on their electronic
   properties, and it can be used to manipulate the ground state of the
   q2DES.}},
Publisher = {{AMER PHYSICAL SOC}},
Address = {{ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA}},
Type = {{Article}},
Language = {{English}},
Affiliation = {{De Luca, GM (Corresponding Author), Univ Napoli Federico II, Dipartimento Fis E Pancini, Complesso Monte St Angelo Via Cinthia, I-80126 Naples, Italy.
   De Luca, GM (Corresponding Author), CNR SPIN, Complesso Monte St Angelo Via Cinthia, I-80126 Naples, Italy.
   De Luca, G. M.; Di Capua, R.; Di Gennaro, E.; Sambri, A., Univ Napoli Federico II, Dipartimento Fis E Pancini, Complesso Monte St Angelo Via Cinthia, I-80126 Naples, Italy.
   De Luca, G. M.; Di Capua, R.; Di Gennaro, E.; Sambri, A.; Granozio, F. Miletto; Salluzzo, M., CNR SPIN, Complesso Monte St Angelo Via Cinthia, I-80126 Naples, Italy.
   Ghiringhelli, G., Politecn Milan, Dipartimento Fis, Piazza Leonardo da Vinci 32, I-20133 Milan, Italy.
   Ghiringhelli, G., Politecn Milan, CNR SPIN, Piazza Leonardo da Vinci 32, I-20133 Milan, Italy.
   Betto, D.; Brookes, N. B., ESRF, 71 Ave Martyrs, F-38000 Grenoble, France.
   Piamonteze, C., Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland.}},
DOI = {{10.1103/PhysRevB.98.115143}},
Article-Number = {{115143}},
ISSN = {{2469-9950}},
EISSN = {{2469-9969}},
Keywords-Plus = {{HIGH-FIELD; GAS; DICHROISM; BEAMLINE; SURFACE}},
Research-Areas = {{Materials Science; Physics}},
Web-of-Science-Categories  = {{Materials Science, Multidisciplinary; Physics, Applied; Physics,
   Condensed Matter}},
ResearcherID-Numbers = {{GRANOZIO, FABIO MILETTO/R-9662-2017
   Brookes, Nicholas B/C-6718-2019
   Ghiringhelli, Giacomo/D-1159-2014
   Di Gennaro, Emiliano/G-6311-2010
   Piamonteze, Cinthia/E-9740-2016
   salluzzo, marco/C-5919-2009}},
ORCID-Numbers = {{GRANOZIO, FABIO MILETTO/0000-0002-9417-7848
   Brookes, Nicholas B/0000-0002-1342-9530
   Ghiringhelli, Giacomo/0000-0003-0867-7748
   Di Gennaro, Emiliano/0000-0003-4231-9776
   salluzzo, marco/0000-0001-8372-6963}},
Funding-Acknowledgement = {{project Quantox of QuantERA ERA-NET Cofund in Quantum Technologies
   {[}731473]}},
Funding-Text = {{The authors acknowledge received funding from the project Quantox of
   QuantERA ERA-NET Cofund in Quantum Technologies (Grant Agreement No.
   731473) implemented within the European Union's Horizon 2020 Programme.
   The authors thank A. Caviglia and C. A. Perroni for useful discussions.}},
Number-of-Cited-References = {{27}},
Times-Cited = {{5}},
Usage-Count-Last-180-days = {{3}},
Usage-Count-Since-2013 = {{34}},
Journal-ISO = {{Phys. Rev. B}},
Doc-Delivery-Number = {{GU7MI}},
Unique-ID = {{ISI:000445507000003}},
OA = {{Green Published}},
DA = {{2020-12-22}},
}