Strong spin-orbit coupling and Dirac nodal lines in the three-dimensional electronic structure of metallic rutile IrO2

Xu, X.; Jiang, J.; Shi, W. J.; Süß, Vicky; Shekhar, C.; Sun, S. C.; Chen, Y. J.; Mo, S. -K.; Felser, C.; Yan, B. H.; Yang, H. F.; Liu, Z. K.; Sun, Y.; Yang, L. X.; Chen, Y. L.

doi:10.1103/physrevb.99.195106

Title: Strong spin-orbit coupling and Dirac nodal lines in the three-dimensional electronic structure of metallic rutile ${IrO}_{2}$

Journal Article · Fri May 03 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.99.195106· OSTI ID:1572006

Xu, X. ^[1]; Jiang, J. ^[2]; Shi, W. J. ^[3]; Süß, Vicky ^[3]; Shekhar, C. ^[3]; Sun, S. C. ^[1]; Chen, Y. J. ^[1]; Mo, S. -K. ^[4]; Felser, C. ^[3]; Yan, B. H. ^[3]; Yang, H. F. ^[5]; Liu, Z. K. ^[5]; Sun, Y. ^[3]; Yang, L. X. ^[6]; Chen, Y. L. ^[7]

Tsinghua Univ., Beijing (People's Republic of China)
ShanghaiTech Univ., Shanghai (People's Republic of China); Univ. of Oxford, Oxford (United Kingdom); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Max Planck Inst. for Chemical Physics of Solids, Dresden (Germany)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
ShanghaiTech Univ., Shanghai (People's Republic of China)
Tsinghua Univ., Beijing (People's Republic of China); Collaborative Innovation Center of Quantum Matter, Beijing (People's Republic of China)
Tsinghua Univ., Beijing (People's Republic of China); ShanghaiTech Univ., Shanghai (People's Republic of China)

Using high-resolution angle-resolved photoemission spectroscopy and ab initio calculation, we have studied the bulk and surface electronic structure of metallic rutile 5d transition metal oxide IrO₂ that harbors both edge and corner sharing Ir-O octahedrons. We observe strong modulation of the band structure by spin-orbit coupling (SOC). The measured band structure is well reproduced by our ab initio calculation without band renormalization, suggesting the absence of the SOC-enhanced correlation effect in IrO₂. In accordance with the calculation, we visualize two types of Dirac nodal lines (DNLs) protected by mirror symmetry and nonsymmorphic crystal symmetry, respectively. SOC gaps the first type of DNLs, which may contribute largely to the strong spin Hall effect. Furthermore, the second type of DNLs at the edges of Brillouin zone, however, remain intact against SOC. Our results not only provide important insights into the exotic transport properties of IrO₂, but also shed light on the understanding of the role of SOC in the iridate family.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1572006

Alternate ID(s):: OSTI ID: 1510546

Journal Information:: Physical Review B, Vol. 99, Issue 19; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 15 works

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Cited By (1)

Dirac nodal lines protected against spin-orbit interaction in ${IrO}_{2}$ Nelson, J. N.; Ruf, J. P.; Lee, Y. Physical Review Materials, Vol. 3, Issue 6 https://doi.org/10.1103/physrevmaterials.3.064205	journal	June 2019

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Title: Strong spin-orbit coupling and Dirac nodal lines in the three-dimensional electronic structure of metallic rutile IrO 2

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