paper

Modifying the Electronic Orbitals of Nickelate Heterostructures Via Structural Distortions

arXiv:1309.2973 · doi:10.1103/PhysRevLett.110.186402

Abstract

We describe a general materials design approach that produces large orbital energy splittings (orbital polarization) in nickelate heterostructures, creating a two-dimensional single-band electronic surface at the Fermi energy. The resulting electronic structure mimics that of the high temperature cuprate superconductors. The two key ingredients are: (i) the construction of atomic-scale distortions about the Ni site via charge transfer and internal electric fields, and (ii) the use of three component (tri-component) superlattices to break inversion symmetry. We use {\it ab initio} calculations to implement the approach, with experimental verification of the critical structural motif that enables the design to succeed.

12 pages, 3 figures and 1 table

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