The Mott insulator LaTiO_3 in heterostructures with SrTiO_3 is metallic

Abstract

It is shown that LaTiO_3 in superlattices with SrTiO_3 is not a Mott insulator but a strongly correlated metal. The tetragonal lattice geometry imposed by the SrTiO_3 substrate leads to an increase of the Ti 3d t2g band width and a reversal of the t2g crystal field relative to the orthorhombic bulk geometry. Using dynamical mean field theory based on finite-temperature multi-band exact diagonalization we show that, as a result of these effects, local Coulomb interactions are not strong enough to induce a Mott transition in tetragonal LaTiO_3. The metalicity of these heterostructures is therefore not an interface property but stems from all LaTiO_3 planes.

arXiv comment4 pages, 4 figures

References in corpus (27)

• Mott transition and suppression of orbital fluctuations in orthorhombic 3$d^1$ perovskites
• Quantum dots in graphene
• Lattice relaxation, electronic screening, and spin and orbital phase diagram of LaTiO${}_3$/SrTiO${}_3$ superlattices
• Crystal and magnetic structure of LaTiO3 : evidence for non-degenerate $t_{2g}$-orbitals
• How chemistry controls electron localization in 3d1 perovskites: A Wannier-function study
• Spatial inhomogeneity and strong correlation physics: a dynamical mean field study of a model Mott-insulator/band-insulator heterostructure
• Photoemission from buried interfaces in SrTiO3/LaTiO3 superlattices
• Novel Mott Transitions in Non-Isotropic Two-Band Hubbard Model
• Subband filling and Mott transition in Ca_{2-x}Sr_xRuO_4
• Lattice polarization effects on electron-gas charge densities in ionic superlattices
• Determination of the orbital moment and crystal field splitting in LaTiO${}_3$
• Theory of Mott insulator/band insulator heterostructure
• Optical Study of the Free Carrier Response of LaTiO3/SrTiO3 Superlattices
• Dynamical mean field theory for strongly correlated inhomogeneous multilayered nanostructures
• Nanometer scale electronic reconstruction at the interface between LaVO3 and LaVO4
• Exact Diagonalization Dynamical Mean Field Theory for Multi-Band Materials: Effect of Coulomb correlations on the Fermi surface of Na_0.3CoO_2
• Modulation Doping near Mott-Insulator Heterojunctions
• Metallic interface at the boundary between band and Mott insulators
• Effect of charge modulation in (LaVO3)m(SrVO3)n superlattices on the insulator-metal transition
• Correlation and surface effects in Vanadium Oxides
• Hard x-ray photoemission study of LaAlO3/LaVO3 multilayers
• Strongly renormalized quasi-two-dimensional electron gas in a heterostructure with correlation effects
• Interface ordering and phase competition in a model Mott-insulator--band-insulator heterostructure
• Non-Fermi-liquid phases in the two-band Hubbard model: Finite-temperature exact diagonalization study of Hund's rule coupling
• Doping-driven Mott transition in La_{1-x}Sr_xTiO_3 via simultaneous electron and hole doping of t2g subbands
• Photoemission study of TiO2/VO2 interfaces
• Coulomb correlations do not fill the e'_g hole pockets in Na_{0.3}CoO_2

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• Formation of orbital-selective electron states in LaTiO${}_3$/SrTiO${}_3$ superlattices
• First-principles modeling of strain in perovskite ferroelectric thin films
• Superconductivity at epitaxial LaTiO3-KTaO3 interfaces
• Electronic and magnetic properties in strongly correlated heterostructures
• Strain-controlled Insulator-Metal Transition in YTiO3/SrTiO3 Superlattices: A First-Principles Study
• Electrical permittivity driven metal-insulator transition in heterostructures of nonpolar Mott- and band insulators
• The importance of inter-site coherences in the x-ray absorption spectra of mixed-valent systems
• A comparative DMFT study of the eg-orbital Hubbard model in thin films
• Linear colossal magnetoresistance driven by magnetic textures in LaTiO3 thin films on SrTiO3
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• Strain-induced interface reconstruction in epitaxial heterostructures
• Effect of Buffer Termination on Intermixing and Conductivity in LaTiO${}_3$/SrTiO${}_3$ Heterostructures Integrated on Si(100)
• Bound States at Semiconductor -- Mott Insulator Interfaces
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