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

L. Moreschini, I. Lo Vecchio, N. P. Breznay, S. Moser, S. Ulstrup, R. Koch, J. Wirjo, C. Jozwiak, K. S. Kim, E. Rotenberg, A. Bostwick, J. G. Analytis, A. Lanzara

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Abstract

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
Issue number16
DOIs
Publication statusPublished - 2017 Oct 30

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Moreschini, L., Lo Vecchio, I., Breznay, N. P., Moser, S., Ulstrup, S., Koch, R., Wirjo, J., Jozwiak, C., Kim, K. S., Rotenberg, E., Bostwick, A., Analytis, J. G., & Lanzara, A. (2017). Quasiparticles and charge transfer at the two surfaces of the honeycomb iridate Na2IrO3. Physical Review B, 96(16), [161116]. https://doi.org/10.1103/PhysRevB.96.161116