Publication: Two-dimensional electron gases at LaAIO_3/SrTiO_3 interfaces: orbital symmetry and hierarchy engineered by crystal orientation
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2014-10-07
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American Physical Society
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Abstract
Recent findings show the emergence of two-dimensional electron gases (2DEGs) at LaAIO_3/SrTiO_3 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 LaAIO_3/SrTiO_3 quantum wells.
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© 2014 American Physical Society. This work was supported by the Spanish Government through MAT2011-29269-C03, and NANOSELECT CSD2007-00041 projects and the Generalitat de Catalunya (2009 SGR 00376 project). J. G. acknowledges the Ramon y Cajal program (RYC-2012-11709). These experiments were performed at the Boreas beam line of the Synchrotron Light Facility ALBA with the collaboration of ALBA staff. Microscopy work was conducted in the STEM Group of the Oak Ridge National Laboratory (ORNL), and in the Laboratorio de Microscopías Avanzadas at the Instituto de Nanociencia de Aragón—Universidad de Zaragoza. Research at ORNL supported by the U.S. Department of Energy (DOE), Basic Energy Sciences (BES), Materials Sciences and Engineering Division (MV). Research atUCMsupported by the ERC Starting Investigator Award STEMOX 739239.
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