Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-05-23
Phys. Rev. B 78, 155123 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 5 figures
Scientific paper
10.1103/PhysRevB.78.155123
We study a two-dimensional Hubbard-Holstein model with phonons treated in the adiabatic limit. A Hartree-Fock decomposition is employed for the Hubbard term. A range of electronic densities are discussed with special emphasis on the quarter-filling ($n=0.5$). We argue that the quarter-filled system is relevant for the electronic properties observed at the interface between LaAlO$_3$ and SrTiO$_3$, where half-electron per unit cell is transferred to the TiO$_2$ layer as a consequence of the polar discontinuity at the interface. In addition to presenting the overall phase diagrams, we identify an interesting charge-ordered antiferromagnetic phase for $n=0.5$, which was also reported recently in the ab-initio study of the LaAlO$_3$-SrTiO$_3$ interface.
Kumar Sanjeev
van den Brink Jeroen
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