Signature of band inversion in the perovskite thin-film alloys BaSn${}_{1-x}$Pb${}_x$O${}_3$

Abstract

Perovskite oxides ABO${}_3$ containing heavy B-site elements are a class of candidate materials to host topological metals with a large spin-orbit interaction. In contrast to the band insulator BaSnO${}_3$, the semimetal BaPbO${}_3$ is proposed to be a typical example with an inverted band structure, the conduction band of which is composed of mainly the O-2p orbital. In this study, we exemplify a band-gap modification by systematic structural, optical, and transport measurements in BaSn${}_{1-x}$Pb${}_x$O${}_3$ films. A sudden suppression of the conductivity and an enhancement of the weak antilocalization effect at $x$ = 0.9 indicate the presence of a singular point in the electronic structure as a signature of the band inversion. Our findings provide an intriguing platform for combining topological aspects and electron correlation in perovskite oxides based on band-gap engineering.

arXiv comment19 pages, 4 figures

References in corpus (22)

• Topological Insulators
• Topological insulators and superconductors
• Quantum Spin Hall Effect and Topological Phase Transition in HgTe Quantum Wells
• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Electronic Structure of Pyrochlore Iridates: From Topological Dirac Metal to Mott Insulator
• Topological Insulators with Inversion Symmetry
• A topological Dirac insulator in a quantum spin Hall phase : Experimental observation of first strong topological insulator
• Multiferroicity, The coupling between magnetic and polarization
• Phase transition between the quantum spin Hall and insulator phases in 3D: emergence of a topological gapless phase
• Mott physics and band topology in materials with strong spin-orbit interaction
• Kramers-Kronig constrained variational analysis of optical spectra
• Quantum Hall Effect from the Topological Surface States of Strained Bulk HgTe
• A sudden collapse in the transport lifetime across the topological phase transition in $(B{i}_{1-x}I{n}_x{)}_{2}S{e}_3$
• Unexpected mass acquisition of Dirac fermions at the quantum phase transition of a topological insulator
• Topological-Metal to Band-Insulator Transition in (Bi1-xInx)2Se3 Thin Films
• Engineering spin-orbital magnetic insulator by tailoring superlattices
• A large energy-gap oxide topological insulator based on the superconductor BaBiO3
• High carrier mobility in transparent Ba1-xLaxSnO3 crystals with a wide band gap
• Origin of the Superior Conductivity of Perovskite Ba(Sr)SnO3
• Magnetic field-induced insulator-semimetal transition in a pyrochlore Nd2Ir2O7
• A pressure-induced topological phase with large Berry curvature in Pb${}_{1-x}$Sn${}_x$Te
• Topological nature and the multiple Dirac cones hidden in Bismuth high-Tc superconductors

Cited by in corpus (1)

• Feeble Metallicity and Robust Semiconducting Regime in Structurally Sensitive Ba(Pb, Sn)O${}_3$ Alloys