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Søren Ulstrup

Quasiparticles and charge transfer at the two surfaces of the honeycomb iridate Na2IrO3

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  • L. Moreschini, Lawrence Berkeley National Laboratory
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  • I. Lo Vecchio, Lawrence Berkeley National Laboratory
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  • N. P. Breznay, Lawrence Berkeley National Laboratory, UC Berkeley
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  • S. Moser, Lawrence Berkeley National Laboratory
  • ,
  • S. Ulstrup
  • R. Koch, Lawrence Berkeley National Laboratory
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  • J. Wirjo, Lawrence Berkeley National Laboratory, UC Berkeley
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  • C. Jozwiak, Lawrence Berkeley National Laboratory
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  • K. S. Kim, Yonsei University
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  • E. Rotenberg, Lawrence Berkeley National Laboratory
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  • A. Bostwick, Lawrence Berkeley National Laboratory
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  • J. G. Analytis, Lawrence Berkeley National Laboratory, UC Berkeley
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  • A. Lanzara, Lawrence Berkeley National Laboratory, UC Berkeley

Direct experimental investigations of the low-energy electronic structure of the Na2IrO3 iridate insulator are sparse and draw two conflicting pictures. One relies on flat bands and a clear gap, the other involves dispersive states approaching the Fermi level, pointing to surface metallicity. Here, by a combination of angle-resolved photoemission, photoemission electron microscopy, and x-ray absorption, we show that the correct picture is more complex and involves an anomalous band, arising from charge transfer from Na atoms to Ir-derived states. Bulk quasiparticles do exist, but in one of the two possible surface terminations the charge transfer is smaller and they remain elusive.

Original languageEnglish
Article number161116
JournalPhysical Review B
Volume96
Issue16
ISSN2469-9950
DOIs
Publication statusPublished - 30 Oct 2017
Externally publishedYes

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