Observation of metallic surface states in the strongly correlated Kitaev-Heisenberg candidate Na2IrO3

Nasser Alidoust; Chang Liu; Su Yang Xu; Ilya Belopolski; Tongfei Qi; Minggang Zeng; Daniel S. Sanchez; Hao Zheng; Guang Bian; Madhab Neupane; Yu Tzu Liu; Stephen D. Wilson; Hsin Lin; Arun Bansil; Gang Cao; M. Zahid Hasan

doi:10.1103/PhysRevB.93.245132

Observation of metallic surface states in the strongly correlated Kitaev-Heisenberg candidate Na2IrO3

Nasser Alidoust, Chang Liu, Su Yang Xu, Ilya Belopolski, Tongfei Qi, Minggang Zeng, Daniel S. Sanchez, Hao Zheng, Guang Bian, Madhab Neupane, Yu Tzu Liu, Stephen D. Wilson, Hsin Lin, Arun Bansil, Gang Cao, M. Zahid Hasan

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Abstract

We report high-resolution angle-resolved photoemission spectroscopy measurements on the honeycomb iridate Na2IrO3. Our measurements reveal the existence of a metallic surface band feature crossing the Fermi level with nearly linear dispersion and an estimated surface carrier density of 3.2×1013cm-2, which has not been theoretically predicted or experimentally observed, and provides the first evidence for metallic behavior on the boundary of this material, whereas the bulk bands exhibit a robust insulating gap. We further show the lack of theoretically predicted Dirac cones at the M points of the surface Brillouin zone, which confirms the absence of a stacked quantum spin Hall phase in this material. Our data indicates that the surface ground state of this material is exotic and metallic, unlike as predicted in theory, and establishes Na2IrO3 as a rare example of a strongly correlated spin-orbit insulator with surface metallicity.

Original language	English (US)
Article number	245132
Journal	Physical Review B
Volume	93
Issue number	24
DOIs	https://doi.org/10.1103/PhysRevB.93.245132
State	Published - Jun 14 2016

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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Alidoust, N., Liu, C., Xu, S. Y., Belopolski, I., Qi, T., Zeng, M., Sanchez, D. S., Zheng, H., Bian, G., Neupane, M., Liu, Y. T., Wilson, S. D., Lin, H., Bansil, A., Cao, G., & Hasan, M. Z. (2016). Observation of metallic surface states in the strongly correlated Kitaev-Heisenberg candidate Na2IrO3. Physical Review B, 93(24), Article 245132. https://doi.org/10.1103/PhysRevB.93.245132

@article{19072582b5ae4cf3bc015b7840f911c7,

title = "Observation of metallic surface states in the strongly correlated Kitaev-Heisenberg candidate Na2IrO3",

abstract = "We report high-resolution angle-resolved photoemission spectroscopy measurements on the honeycomb iridate Na2IrO3. Our measurements reveal the existence of a metallic surface band feature crossing the Fermi level with nearly linear dispersion and an estimated surface carrier density of 3.2×1013cm-2, which has not been theoretically predicted or experimentally observed, and provides the first evidence for metallic behavior on the boundary of this material, whereas the bulk bands exhibit a robust insulating gap. We further show the lack of theoretically predicted Dirac cones at the M points of the surface Brillouin zone, which confirms the absence of a stacked quantum spin Hall phase in this material. Our data indicates that the surface ground state of this material is exotic and metallic, unlike as predicted in theory, and establishes Na2IrO3 as a rare example of a strongly correlated spin-orbit insulator with surface metallicity.",

author = "Nasser Alidoust and Chang Liu and Xu, {Su Yang} and Ilya Belopolski and Tongfei Qi and Minggang Zeng and Sanchez, {Daniel S.} and Hao Zheng and Guang Bian and Madhab Neupane and Liu, {Yu Tzu} and Wilson, {Stephen D.} and Hsin Lin and Arun Bansil and Gang Cao and Hasan, {M. Zahid}",

note = "Funding Information: We thank Jonathan D. Denlinger for technical assistance. Work at Princeton University is supported by the US National Science Foundation Grant No. NSF-DMR-1006492. M.Z.H. acknowledges visiting scientist support from Lawrence Berkeley National Laboratory and additional partial support from the A. P. Sloan Foundation and NSF-DMR-0819860. G.C. acknowledges NSF support via Grant No. DMR 1265162. The photoemission measurements using synchrotron x-ray facilities are supported by the Basic Energy Sciences of the US Department of Energy under DE-FG-02-05ER46200. Publisher Copyright: {\textcopyright} 2016 American Physical Society.",

year = "2016",

month = jun,

day = "14",

doi = "10.1103/PhysRevB.93.245132",

language = "English (US)",

volume = "93",

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issn = "2469-9950",

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T1 - Observation of metallic surface states in the strongly correlated Kitaev-Heisenberg candidate Na2IrO3

AU - Alidoust, Nasser

AU - Liu, Chang

AU - Xu, Su Yang

AU - Belopolski, Ilya

AU - Qi, Tongfei

AU - Zeng, Minggang

AU - Sanchez, Daniel S.

AU - Zheng, Hao

AU - Bian, Guang

AU - Neupane, Madhab

AU - Liu, Yu Tzu

AU - Wilson, Stephen D.

AU - Lin, Hsin

AU - Bansil, Arun

AU - Cao, Gang

AU - Hasan, M. Zahid

N1 - Funding Information: We thank Jonathan D. Denlinger for technical assistance. Work at Princeton University is supported by the US National Science Foundation Grant No. NSF-DMR-1006492. M.Z.H. acknowledges visiting scientist support from Lawrence Berkeley National Laboratory and additional partial support from the A. P. Sloan Foundation and NSF-DMR-0819860. G.C. acknowledges NSF support via Grant No. DMR 1265162. The photoemission measurements using synchrotron x-ray facilities are supported by the Basic Energy Sciences of the US Department of Energy under DE-FG-02-05ER46200. Publisher Copyright: © 2016 American Physical Society.

PY - 2016/6/14

Y1 - 2016/6/14

N2 - We report high-resolution angle-resolved photoemission spectroscopy measurements on the honeycomb iridate Na2IrO3. Our measurements reveal the existence of a metallic surface band feature crossing the Fermi level with nearly linear dispersion and an estimated surface carrier density of 3.2×1013cm-2, which has not been theoretically predicted or experimentally observed, and provides the first evidence for metallic behavior on the boundary of this material, whereas the bulk bands exhibit a robust insulating gap. We further show the lack of theoretically predicted Dirac cones at the M points of the surface Brillouin zone, which confirms the absence of a stacked quantum spin Hall phase in this material. Our data indicates that the surface ground state of this material is exotic and metallic, unlike as predicted in theory, and establishes Na2IrO3 as a rare example of a strongly correlated spin-orbit insulator with surface metallicity.

AB - We report high-resolution angle-resolved photoemission spectroscopy measurements on the honeycomb iridate Na2IrO3. Our measurements reveal the existence of a metallic surface band feature crossing the Fermi level with nearly linear dispersion and an estimated surface carrier density of 3.2×1013cm-2, which has not been theoretically predicted or experimentally observed, and provides the first evidence for metallic behavior on the boundary of this material, whereas the bulk bands exhibit a robust insulating gap. We further show the lack of theoretically predicted Dirac cones at the M points of the surface Brillouin zone, which confirms the absence of a stacked quantum spin Hall phase in this material. Our data indicates that the surface ground state of this material is exotic and metallic, unlike as predicted in theory, and establishes Na2IrO3 as a rare example of a strongly correlated spin-orbit insulator with surface metallicity.

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Observation of metallic surface states in the strongly correlated Kitaev-Heisenberg candidate Na2IrO3

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