Two-dimensional electron gases at LaAlO3/SrTiO3 interfaces: Orbital symmetry and hierarchy engineered by crystal orientation

D. Pesquera, M. Scigaj, P. Gargiani, A. Barla, J. Herrero-Martín, E. Pellegrin, S. M. Valvidares, J. Gázquez, M. Varela, N. Dix, J. Fontcuberta, F. Sánchez, G. Herranz

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Abstract

© 2014 American Physical Society. 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. 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.
Original languageEnglish
Article number156802
JournalPhysical Review Letters
Volume113
Issue number15
DOIs
Publication statusPublished - 7 Oct 2014

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    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. (2014). Two-dimensional electron gases at LaAlO3/SrTiO3 interfaces: Orbital symmetry and hierarchy engineered by crystal orientation. Physical Review Letters, 113(15), [156802]. https://doi.org/10.1103/PhysRevLett.113.156802