Tuning the two-dimensional electron gas at the LaAlO3/SrTiO3(001) interface by metallic contacts

Details Tuning the two-dimensional electron gas at the LaAlO3/SrTiO3(001) interface by metallic contacts Tuning the two-dimensional electron gas at the LaAlO3/SrTiO3(001) interface by metallic contacts

2011-06-21

arxiv.org/abs/1106.4205v1

Phys. Rev. B 85, 125404 (2012)

Physics

Condensed Matter

Materials Science

4 pages, 4 figures, submitted for publication

Scientific paper

10.1103/PhysRevB.85.125404

First principles calculations reveal that adding a metallic overlayer on LaAlO3/SrTiO3(001) eliminates the electric field within the polar LaAlO3 film and thus suppresses the thickness-dependent insulator-to-metal transition observed in uncovered films. Independent of the LaAlO3 thickness both the surface and the interface are metallic, with an enhanced interface carrier density relative to LaAlO3/SrTiO3(001) after the metallization transition. Moreover, a monolayer thick metallic Ti-contact exhibits a finite magnetic moment and for a thin SrTiO3-substrate induces a spin-polarized 2D electron gas at the n-type interface due to confinement effects. A diagram of band alignment in M/LaAlO3/SrTiO3(001) and Schottky barriers for M=Ti, Al, and Pt are provided.

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