Spin, Orbital and Charge Order at the Interface between Correlated Oxides

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Jackeli, G.
Khaliullin, G.
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Abstract
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The collective behavior of correlated electrons in the VO$_2-$interface layer of LaVO$_3$/SrTiO$_3$ heterostructure is studied within a quarter-filled $t_{2g}$-orbital Hubbard model on a square lattice. We argue that the ground state is ferromagnetic driven by the double exchange mechanism, and is orbitally and charge ordered due to a confined geometry and electron correlations. The orbital and charge density waves open gaps on the entire Fermi surfaces of all orbitals. The theory explains the observed insulating behavior of the $p$-type interface between LaVO$_3$ and SrTiO$_3$.
Comment: 4 pages, 5 figures; revised, to appear in Phys. Rev. Lett
Keywords
Condensed Matter - Strongly Correlated Electrons
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