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

doi:10.1103/PhysRevB.96.161116

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

Department of Physics

Research output: Contribution to journal › Article

3 Citations (Scopus)

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 language	English
Article number	161116
Journal	Physical Review B
Volume	96
Issue number	16
DOIs	https://doi.org/10.1103/PhysRevB.96.161116
Publication status	Published - 2017 Oct 30

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All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Cite this

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

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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.",

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

In: Physical Review B, Vol. 96, No. 16, 161116, 30.10.2017.

Research output: Contribution to journal › Article

TY - JOUR

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AU - Moreschini, L.

AU - Lo Vecchio, I.

AU - Breznay, N. P.

AU - Moser, S.

AU - Ulstrup, S.

AU - Koch, R.

AU - Wirjo, J.

AU - Jozwiak, C.

AU - Kim, K. S.

AU - Rotenberg, E.

AU - Bostwick, A.

AU - Analytis, J. G.

AU - Lanzara, A.

PY - 2017/10/30

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AB - 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.

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10.1103/PhysRevB.96.161116