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Dirac line node (DLN) materials are topological semimetals wherein a set ofsymmetry protected crossing points forms a one-dimensional (1D) line inreciprocal space. Not only are the linearly dispersing bands expected to giverise to exceptional electronic properties, but the weak screening of theCoulomb interaction near the line node may enhance electronic correlations,produce new many-body ground states, or influence the quasiparticle lifetime.We investigate the quasiparticle dynamics in the DLN material ZrSiS viaspectroscopic imaging scanning tunneling microscopy (SI-STM). By studying thespatial decay of quasiparticle interference patterns (QPI) from pointscatterers, we were able to directly and selectively extract the phasecoherence length $l_{\textrm{QPI}}$ and lifetime $\tau_{\textrm{QPI}}$ for thebulk DLN excitations, which are dominated by inelastic electron-electronscattering. We find that the experimental $\tau_{\textrm{QPI}}(E)$ values below$-$40 meV are very short, likely due to the stronger Coulomb interactions, andlie at the Planckian limit $\hbar/|E|$. Our results corroborate a growing bodyof experimental reports demonstrating unusual electronic correlation effectsnear a DLN.

Real-space visualization of quasiparticle dephasing near the Planckian limit in the Dirac line node material ZrSiS