Abstract
A theory of heterostructures comprised of LaTiO3 (a Mott insulator) and SrTiO3 (a band insulator) is presented. The band structure of the Ti d-electrons is treated with a nearest neighbor tight-binding approximation; the electric fields arising from the La3+/Sr 2+ charge difference and the carriers are treated within a Hartree approximation; and the on-site interactions are treated by unrestricted Hartree-Fock. The phase diagram as a function of interaction strength and layer number is determined and predictions are made for optical conductivity experiments. A noteworthy finding is that the edges of the heterostructure are generally metallic.
Original language | English |
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Article number | 075101 |
Pages (from-to) | 075101-1-075101-12 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 70 |
Issue number | 7 |
DOIs | |
State | Published - Aug 2004 |
Externally published | Yes |
Funding
The authors acknowledge very helpful conversations with H. Y. Hwang and M. Potthoff. This research was supported by NSF DMR-0338376 (A.J.M.) and JSPS (S.O.).