2018/11/07 by Sota Kitamura, Kitamura, Sota, Hidetomo Usui +25
Materials Science · Physics and Astronomy · #Copper-based nanomaterials and applications #FOS: Physical sciences #Magnetic Properties and Synthesis of Ferrites #Magnetic properties of thin films #Materials Science (cond-mat.mtrl-sci) #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #cond-mat.mes-hall #cond-mat.mtrl-sci
paper · pdf · doi:10.48550/arxiv.1811.03105
9 pages, 7 figures
arxiv created 2018/11/07 · openalex publication_date 2018/11/07 · arxiv updated 2018/11/09 · openalex created_date 2018/11/16 · openalex updated_date 2026/08/02
The two-dimensional (2D) metal PtCoO2 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 PtCoO2 as a promising material for spintronic applications as well as a platform to study the interplay of symmetry and topology.