Nonsymmorphic Symmetry-Protected Band Crossings in a Square-Net Metal PtPb${}_4$

Abstract

Topological semimetals with symmetry-protected band crossings have emerged as a rich landscape to explore intriguing electronic phenomena. Nonsymmorphic symmetries in particular have been shown to play an important role in protecting the crossings along a line (rather than a point) in momentum space. Here we report experimental and theoretical evidence for Dirac nodal line crossings along the Brillouin zone boundaries in PtPb${}_4$, arising from the nonsymmorphic symmetry of its crystal structure. Interestingly, while the nodal lines would remain gapless in the absence of spin-orbit coupling (SOC), the SOC in this case plays a detrimental role to topology by lifting the band degeneracy everywhere except at a set of isolated points. Nevertheless, the nodal line is observed to have a bandwidth much smaller than that found in density functional theory (DFT). Our findings reveal PtPb${}_4$ to be a material system with narrow crossings approximately protected by non-symmorhpic crystalline symmetries.

21 pages, 4 figures, accepted for publication in npj Quantum Mater

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• Discovery of a magnetic Dirac system with large intrinsic non-linear Hall effect
• Two-Step Electronic Response to Magnetic Ordering in a van der Waals Ferromagnet
• Node-line Dirac semimetal manipulated by Kondo mechanism in nonsymmorphic CePt${}_2$Si${}_2$
• Frequency-dependent Faraday and Kerr rotation in anisotropic nonsymmorphic Dirac semimetals
• Linear Magnetoresistance and Type-I Superconductivity in $\beta$-IrSn${}_4$
• Superconducting density of states of PtPb4
• Emergent impervious band crossing in the bulk in topological nodal line semimetal ZrAs${}_2$
• Intrinsic defect intolerance in the ultra-pure metal PtSn${}_4$
• AC conductivity and magnetic dichroism of two-dimensional antiferromagnetic Dirac semimetals
• Ultrafast Carrier Relaxation and Second Harmonic Generation in a Higher-Fold Weyl Fermionic System PtAl
• Correlated Dirac semimetal states in nonsymmorphic MIrO${}_3$ (M=Sr, Ba and Ca)