Electronic band structure of a two-dimensional oxide quasicrystal

Chiang, Cheng-Tien; Ellguth, Martin; Schumann, Florian O.; Tusche, Christian; Kraska, Richard; Förster, Stefan; Widdra, Wolf

doi:10.1103/PhysRevB.100.125149

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Electronic band structure of a two-dimensional oxide quasicrystal

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Chiang, Cheng-Tien
Max Planck Institute of Microstructure Physics, Max Planck Society;

Ellguth, Martin
Max Planck Institute of Microstructure Physics, Max Planck Society;

Tusche, Christian
Max Planck Institute of Microstructure Physics, Max Planck Society;

Widdra, Wolf
Max Planck Institute of Microstructure Physics, Max Planck Society;

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https://doi.org/10.1103/PhysRevB.100.125149
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Citation

Chiang, C.-T., Ellguth, M., Schumann, F. O., Tusche, C., Kraska, R., Förster, S., et al. (2019). Electronic band structure of a two-dimensional oxide quasicrystal. Physical Review B, 100(12): 125149. doi:10.1103/PhysRevB.100.125149.

Cite as: https://hdl.handle.net/21.11116/0000-0009-106E-A

Abstract

The valence band electronic structure of a BaTiO₃-derived oxide quasicrystal (OQC) is studied by photoemission using momentum microscopy. An upward-dispersive O_2p band is identified, and it can be assigned to a combination of in-plane orbitals according to the symmetry and the overlap of the wave functions. In addition, the signature of Ti_3d states near the Fermi level is observed, which results in a metallic character of the OQC with 3d¹ occupation. Our experiments reveal two-dimensional electronic states within the OQC based on a symmetry-adapted decomposition of photoelectron intensity distribution in the momentum space.