3 years ago

Quasiparticles and charge transfer at the two surfaces of the honeycomb iridate Na$_2$IrO$_3$.

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

Direct experimental investigations of the low-energy electronic structure of the Na$_2$IrO$_3$ 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.

Publisher URL: http://arxiv.org/abs/1710.11602

DOI: arXiv:1710.11602v2

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