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Title: Two-Dimensional Electron Gases at LaAlO 3/SrTiO 3 Interfaces: Orbital Symmetry and Hierarchy Engineered by Crystal Orientation

Abstract

Recent findings show the emergence of two-dimensional electron gases (2DEGs) at LaAlO 3/SrTiO 3 interfaces along different orientations; yet details on band reconstructions have remained so far unknown. In this study, via x-ray linear dichroism spectroscopy, we demonstrate that crystal symmetry imposes distinctive 2DEG orbital hierarchies on (001)-and (110)-oriented quantum wells, allowing selective occupancy of states of different symmetry. Such orientational tuning expands the possibilities for electronic engineering of 2DEGs and opens up enticing opportunities to understand the link between orbital symmetry and complex correlated states at LaAlO 3/SrTiO 3 quantum wells.

Authors:
 [1];  [2];  [3];  [4];  [3];  [3];  [3];  [1];  [5];  [1];  [1];  [1];  [1]
  1. Institut de Ciencia de Materials de Barcelona, ICMAB-CSIC, Bellaterra (Spain)
  2. Institut de Ciencia de Materials de Barcelona, ICMAB-CSIC, Bellaterra (Spain); Universitat Autonoma de Barcelona, Bellaterra, Barcelona, Catalonia (Spain)
  3. ALBA Synchrotron Light Source, Cerdanyola del Valles, Barcelona (Spain)
  4. Istituto di Struttura della Materia, Trieste (Italy)
  5. Univ. Complutense Madrid (Spain); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1265298
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 113; Journal Issue: 15; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Pesquera, D., Scigaj, M., Gargiani, P., Barla, A., Herrero-Martín, J., Pellegrin, E., Valvidares, S. M., Gázquez, J., Varela, M., Dix, N., Fontcuberta, J., Sánchez, F., and Herranz, G. Two-Dimensional Electron Gases at LaAlO3/SrTiO3 Interfaces: Orbital Symmetry and Hierarchy Engineered by Crystal Orientation. United States: N. p., 2014. Web. doi:10.1103/PhysRevLett.113.156802.
Pesquera, D., Scigaj, M., Gargiani, P., Barla, A., Herrero-Martín, J., Pellegrin, E., Valvidares, S. M., Gázquez, J., Varela, M., Dix, N., Fontcuberta, J., Sánchez, F., & Herranz, G. Two-Dimensional Electron Gases at LaAlO3/SrTiO3 Interfaces: Orbital Symmetry and Hierarchy Engineered by Crystal Orientation. United States. doi:10.1103/PhysRevLett.113.156802.
Pesquera, D., Scigaj, M., Gargiani, P., Barla, A., Herrero-Martín, J., Pellegrin, E., Valvidares, S. M., Gázquez, J., Varela, M., Dix, N., Fontcuberta, J., Sánchez, F., and Herranz, G. Tue . "Two-Dimensional Electron Gases at LaAlO3/SrTiO3 Interfaces: Orbital Symmetry and Hierarchy Engineered by Crystal Orientation". United States. doi:10.1103/PhysRevLett.113.156802.
@article{osti_1265298,
title = {Two-Dimensional Electron Gases at LaAlO3/SrTiO3 Interfaces: Orbital Symmetry and Hierarchy Engineered by Crystal Orientation},
author = {Pesquera, D. and Scigaj, M. and Gargiani, P. and Barla, A. and Herrero-Martín, J. and Pellegrin, E. and Valvidares, S. M. and Gázquez, J. and Varela, M. and Dix, N. and Fontcuberta, J. and Sánchez, F. and Herranz, G.},
abstractNote = {Recent findings show the emergence of two-dimensional electron gases (2DEGs) at LaAlO3/SrTiO3 interfaces along different orientations; yet details on band reconstructions have remained so far unknown. In this study, via x-ray linear dichroism spectroscopy, we demonstrate that crystal symmetry imposes distinctive 2DEG orbital hierarchies on (001)-and (110)-oriented quantum wells, allowing selective occupancy of states of different symmetry. Such orientational tuning expands the possibilities for electronic engineering of 2DEGs and opens up enticing opportunities to understand the link between orbital symmetry and complex correlated states at LaAlO3/SrTiO3 quantum wells.},
doi = {10.1103/PhysRevLett.113.156802},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 15,
volume = 113,
place = {United States},
year = {2014},
month = {10}
}

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