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 › peer-review

6 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

Bibliographical note

Funding Information:
This research used resources of the Advanced Light Source, which is a DOE Office of Science User Facility under Contract No. DE-AC02-05CH11231. I.L.V. and A.L. acknowledge support from the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, under Contract No. DE-AC02-05-CH11231 (Quantum materials KC2202). S.M. acknowledges support by the Swiss National Science Foundation under Grant No. P300P2-171221. S.U. acknowledges financial support from the Danish Council for Independent Research, Natural Sciences under the Sapere Aude program (Grant No. DFF-4090-00125). J.G.A. acknowledges support towards the synthesis of materials from the Department of Energy Early Career program, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, under Contract No. DE-AC02-05CH11231. N.P.B. and J.G.A. acknowledge support from the Gordon and Betty Moore Foundations EPiQS Initiative through Grant No. GBMF4374.

Publisher Copyright:
© 2017 American Physical Society.

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1103/PhysRevB.96.161116

Cite this

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title = "Quasiparticles and charge transfer at the two surfaces of the honeycomb iridate Na2IrO3",

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.",

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

note = "Funding Information: This research used resources of the Advanced Light Source, which is a DOE Office of Science User Facility under Contract No. DE-AC02-05CH11231. I.L.V. and A.L. acknowledge support from the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, under Contract No. DE-AC02-05-CH11231 (Quantum materials KC2202). S.M. acknowledges support by the Swiss National Science Foundation under Grant No. P300P2-171221. S.U. acknowledges financial support from the Danish Council for Independent Research, Natural Sciences under the Sapere Aude program (Grant No. DFF-4090-00125). J.G.A. acknowledges support towards the synthesis of materials from the Department of Energy Early Career program, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, under Contract No. DE-AC02-05CH11231. N.P.B. and J.G.A. acknowledge support from the Gordon and Betty Moore Foundations EPiQS Initiative through Grant No. GBMF4374. Publisher Copyright: {\textcopyright} 2017 American Physical Society.",

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language = "English",

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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.

N1 - Funding Information: This research used resources of the Advanced Light Source, which is a DOE Office of Science User Facility under Contract No. DE-AC02-05CH11231. I.L.V. and A.L. acknowledge support from the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, under Contract No. DE-AC02-05-CH11231 (Quantum materials KC2202). S.M. acknowledges support by the Swiss National Science Foundation under Grant No. P300P2-171221. S.U. acknowledges financial support from the Danish Council for Independent Research, Natural Sciences under the Sapere Aude program (Grant No. DFF-4090-00125). J.G.A. acknowledges support towards the synthesis of materials from the Department of Energy Early Career program, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, under Contract No. DE-AC02-05CH11231. N.P.B. and J.G.A. acknowledge support from the Gordon and Betty Moore Foundations EPiQS Initiative through Grant No. GBMF4374. Publisher Copyright: © 2017 American Physical Society.

PY - 2017/10/30

Y1 - 2017/10/30

N2 - 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

Abstract

Bibliographical note

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