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Nodal-chain metals

Title	Nodal-chain metals
Authors	Tomáš Bzdušek, QuanSheng Wu, Andreas Rüegg, Manfred Sigrist, Alexey A. Soluyanov
Magazine	Nature
Date	08/24/2016
DOI	10.1038/nature19099
Introduction	The band theory of solids stands as a cornerstone of condensed-matter physics, effectively describing electronic energy levels across diverse materials. This framework yields electronic wavefunctions crucial for the topological characterisation of metals, which can host resilient, topologically protected fermionic quasiparticles. While some of these quasiparticles parallel elementary particles of the Standard Model, others lack counterparts in high-energy theories, highlighting a gap in the comprehensive enumeration of possible quasiparticles in solids. This work presents a previously unrecognised type of fermionic excitation within metals, termed a nodal chain. This excitation manifests as a series of connected loops in momentum space, where conduction and valence bands meet. We establish that this nodal chain exhibits topological properties distinct from previously reported excitations. The study details the symmetry conditions essential for its emergence and posits its presence in iridium tetrafluoride (IrF4) and related compounds. Utilising IrF4 as a case study, we elaborate on the topological surface states associated with the nodal chain. We further contend that the presence of these nodal-chain fermions will induce anomalous magnetotransport behaviours, distinguishing them from those observed in materials with known excitations.
Quote	Tomáš Bzdušek, QuanSheng Wu and Andreas Rüegg et al. Nodal-chain metals. Nature. 2016. Vol. 538(7623):75-78. DOI: 10.1038/nature19099
Element	Iridium (Ir) , Fluorine (F)
Materials	Metals and Alloys , Chemical Compounds
Topics	Computational Materials Science , Smart and Functional Materials
Industry	Research & Laboratory

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