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Scientific article
Open access
English

Band inversion driven by electronic correlations at the (111) LaAlO3/SrTiO3 interface

Published inPhysical review. B., vol. 99, no. 20, 201102
Publication date2019-05-07
First online date2019-05-07
Abstract

Quantum confinement at complex oxide interfaces establishes an intricate hierarchy of the strongly correlated d orbitals which is widely recognized as a source of emergent physics. The most prominent example is the (001) LaAlO3/SrTiO3 (LAO/STO) interface, which features a dome-shaped phase diagram of superconducting critical temperature and spin-orbit coupling (SOC) as a function of electrostatic doping, arising from a selective occupancy of t2g orbitals of different character. Here we study (111)-oriented LAO/STO interfaces, where the three t2g orbitals contribute equally to the subband states caused by confinement, and investigate the impact of this unique feature on electronic transport. We show that transport occurs through two sets of electronlike subbands, and the carrier density of one of the sets shows a nonmonotonic dependence on the sample conductance. Using tight-binding modeling, we demonstrate that this behavior stems from a band inversion driven by on-site Coulomb interactions. The balanced contribution of all t2g orbitals to electronic transport is shown to result in strong SOC with reduced electrostatic modulation.

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Affiliation Not a UNIGE publication
Research group
Funding
  • European Commission - Designer Quantum Materials Out of Equilibrium [677458]
Citation (ISO format)
MONTEIRO, A. M. R. V. L. et al. Band inversion driven by electronic correlations at the (111) LaAlO<sub>3</sub>/SrTiO<sub>3</sub> interface. In: Physical review. B., 2019, vol. 99, n° 20, p. 201102. doi: 10.1103/PhysRevB.99.201102
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ISSN of the journal2469-9950
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