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Spin Hall effect in 2D metallic delafossite PtCoO$_2$ and vicinity topology

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Title: Spin Hall effect in 2D metallic delafossite PtCoO$_2$ and vicinity topology
Authors: Kitamura, Sota, Usui, Hidetomo, Slager, Robert-Jan, Bouhon, Adrien, Sunko, Veronika, Rosner, Helge, King, Philip D. C., Orenstein, Joseph, Moessner, Roderich, Mackenzie, Andrew P., Kuroki, Kazuhiko, Oka, Takashi
Publication Year: 2018
Collection: Condensed Matter
Subject Terms: Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science
More Details: The two-dimensional (2D) metal PtCoO$_2$ is renowned for the lowest room temperature resistivity among all oxides, close to that of the top two materials Ag and Cu. In addition, we theoretically predict a strong intrinsic spin Hall effect. This originates from six strongly-tilted Dirac cones that we find in the electronic structure near the Fermi surface, where a gap is opened by large spin-orbit coupling (SOC). This is underpinned by rich topological properties; in particular, the phenomenology of a mirror Chern metal is realized not exactly, but very accurately, on account of an approximate crystalline symmetry. We expect that such 'vicinity topology' to be a feature of relevance well beyond this material. Our Wilson loop analysis indicates further elaborate features such as fragile topology. These findings highlight PtCoO$_2$ as a promising material for spintronic applications as well as a platform to study the interplay of symmetry and topology.
Comment: 9 pages, 7 figures
Document Type: Working Paper
Access URL: http://arxiv.org/abs/1811.03105
Accession Number: edsarx.1811.03105
Database: arXiv
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  Data: Spin Hall effect in 2D metallic delafossite PtCoO$_2$ and vicinity topology
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  Data: <searchLink fieldCode="AR" term="%22Kitamura%2C+Sota%22">Kitamura, Sota</searchLink><br /><searchLink fieldCode="AR" term="%22Usui%2C+Hidetomo%22">Usui, Hidetomo</searchLink><br /><searchLink fieldCode="AR" term="%22Slager%2C+Robert-Jan%22">Slager, Robert-Jan</searchLink><br /><searchLink fieldCode="AR" term="%22Bouhon%2C+Adrien%22">Bouhon, Adrien</searchLink><br /><searchLink fieldCode="AR" term="%22Sunko%2C+Veronika%22">Sunko, Veronika</searchLink><br /><searchLink fieldCode="AR" term="%22Rosner%2C+Helge%22">Rosner, Helge</searchLink><br /><searchLink fieldCode="AR" term="%22King%2C+Philip+D%2E+C%2E%22">King, Philip D. C.</searchLink><br /><searchLink fieldCode="AR" term="%22Orenstein%2C+Joseph%22">Orenstein, Joseph</searchLink><br /><searchLink fieldCode="AR" term="%22Moessner%2C+Roderich%22">Moessner, Roderich</searchLink><br /><searchLink fieldCode="AR" term="%22Mackenzie%2C+Andrew+P%2E%22">Mackenzie, Andrew P.</searchLink><br /><searchLink fieldCode="AR" term="%22Kuroki%2C+Kazuhiko%22">Kuroki, Kazuhiko</searchLink><br /><searchLink fieldCode="AR" term="%22Oka%2C+Takashi%22">Oka, Takashi</searchLink>
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  Data: 2018
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  Data: The two-dimensional (2D) metal PtCoO$_2$ is renowned for the lowest room temperature resistivity among all oxides, close to that of the top two materials Ag and Cu. In addition, we theoretically predict a strong intrinsic spin Hall effect. This originates from six strongly-tilted Dirac cones that we find in the electronic structure near the Fermi surface, where a gap is opened by large spin-orbit coupling (SOC). This is underpinned by rich topological properties; in particular, the phenomenology of a mirror Chern metal is realized not exactly, but very accurately, on account of an approximate crystalline symmetry. We expect that such 'vicinity topology' to be a feature of relevance well beyond this material. Our Wilson loop analysis indicates further elaborate features such as fragile topology. These findings highlight PtCoO$_2$ as a promising material for spintronic applications as well as a platform to study the interplay of symmetry and topology.<br />Comment: 9 pages, 7 figures
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      – SubjectFull: Condensed Matter - Mesoscale and Nanoscale Physics
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      – SubjectFull: Condensed Matter - Materials Science
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