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

Research output: Contribution to journalArticlepeer-review

5 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 languageEnglish
Article number161116
JournalPhysical Review B
Volume96
Issue number16
DOIs
Publication statusPublished - 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.

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Quasiparticles and charge transfer at the two surfaces of the honeycomb iridate Na2IrO3'. Together they form a unique fingerprint.

Cite this