Resonant soft-x-ray scattering measurements have been performed to investigate interface electronic structures of (LaAlO3/SrTiO 3) superlattices. Resonant scattering intensities at superlattice reflections show clear evidence of degeneracy lifting in t2g states of interface Ti ions. Polarization dependence of intensities indicates the energy of dxy states is lower by ∼1 eV than two other t 2g states. The energy splitting is insensitive to epitaxial strain. The orbital reconstruction is induced by oxygen vacancies and confined to the interface within two unit cells, indicating charge compensation at the polar interfaces.
|Journal||Physical Review Letters|
|State||Published - Jan 3 2013|
ASJC Scopus subject areas
- Physics and Astronomy (all)