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Tailoring interfacial properties in CaVO3 thin films and heterostructures with SrTiO3 and LaAlO3: A DFT+DMFT study

Sophie Beck1*, Claude Ederer1*

1 Materials Theory, ETH Zürich, Wolfgang-Pauli-Strasse 27, 8093, Zürich, Switzerland

* Corresponding authors emails: sbeck@flatironinstitute.org, claude.ederer@math.ethz.ch
DOI10.24435/materialscloud:kf-h1 [version v1]

Publication date: Dec 22, 2020

How to cite this record

Sophie Beck, Claude Ederer, Tailoring interfacial properties in CaVO3 thin films and heterostructures with SrTiO3 and LaAlO3: A DFT+DMFT study, Materials Cloud Archive 2020.170 (2020), doi: 10.24435/materialscloud:kf-h1.

Description

In this paper we use density functional theory combined with dynamical mean-field theory (DFT+DMFT) to study interface effects between the correlated metal CaVO3 and the two typical substrate materials SrTiO3 and LaAlO3. We find that the CaVO3/SrTiO3 interface has only a marginal influence on the CaVO3 thin film, with the dominant effect being the (bulklike) epitaxial strain imposed by the large lattice mismatch, rendering the CaVO3 film insulating due to the enhanced orbital polarization related to the strong level splitting between the t2g orbitals. In contrast, at the polar CaVO3/LaAlO3 interface, the presence of the interface can have a huge effect on the physical properties, depending both on the specific interface termination and on the specific boundary conditions imposed by the multilayer geometry. We compare three approaches to modeling the CaVO3/LaAlO3 interface, all of which impose a different set of (electrostatic) boundary conditions. Our results demonstrate that different substrates, interface terminations, and electrostatic boundary conditions can drastically affect the properties of thin-film heterostructures, indicating the potential tunability of the interfacial properties via multilayer engineering.

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Keywords

Dynamical Mean Field Theory MARVEL/DD5 First-principles calculations correlated metal Multilayer thin films Superlattices metal-insulator transition

Version history:

2020.170 (version v1) [This version] Dec 22, 2020 DOI10.24435/materialscloud:kf-h1