Two-Dimensional Electron Gases at LaAlO3/SrTiO3 Interfaces: Orbital Symmetry and Hierarchy Engineered by Crystal Orientation

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.

doi:10.1103/PhysRevLett.113.156802

Title: Two-Dimensional Electron Gases at LaAlO₃/SrTiO₃ Interfaces: Orbital Symmetry and Hierarchy Engineered by Crystal Orientation

Journal Article · Tue Oct 07 00:00:00 EDT 2014 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.113.156802· OSTI ID:1265298

Pesquera, D. ^[1]; Scigaj, M. ^[2]; Gargiani, P. ^[3]; Barla, A. ^[4]; Herrero-Martín, J. ^[3]; Pellegrin, E. ^[3]; Valvidares, S. M. ^[3]; Gázquez, J. ^[1]; Varela, M. ^[5]; Dix, N. ^[1]; Fontcuberta, J. ^[1]; Sánchez, F. ^[1]; Herranz, G. ^[1]

Institut de Ciencia de Materials de Barcelona, ICMAB-CSIC, Bellaterra (Spain)
Institut de Ciencia de Materials de Barcelona, ICMAB-CSIC, Bellaterra (Spain); Universitat Autonoma de Barcelona, Bellaterra, Barcelona, Catalonia (Spain)
ALBA Synchrotron Light Source, Cerdanyola del Valles, Barcelona (Spain)
Istituto di Struttura della Materia, Trieste (Italy)
Univ. Complutense Madrid (Spain); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1265298

Journal Information:: Physical Review Letters, Vol. 113, Issue 15; ISSN 0031-9007

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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Title: Two-Dimensional Electron Gases at LaAlO₃/SrTiO₃ Interfaces: Orbital Symmetry and Hierarchy Engineered by Crystal Orientation