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Out-of-equilibrium effects provide an elegant pathway to probing andunderstanding the underlying physics of topological materials. Creating exoticstates of matter using ultrafast optical pulses in particular has shown promisetowards controlling electronic band structure properties. Of recent interest isband renormalization in Dirac and Weyl semimetals as it leads to directphysical observables through the enhancement of the effective mass, or, in theshift of resonant energies. Here we provide experimental and theoreticalsignatures of photo-induced renormalization of the electronic band structure ina topological nodal line semimetal ZrSiS. Specifically, we show how the changeof the transient reflectivity spectra under femtosecond optical excitations isinduced by out-of-equilibrium effects that renormalize the kinetic energy ofelectrons. We associate the observed spectral shift to an enhancement of theeffective mass and to a red-shift of the resonant frequency as a function ofpump field strength. Finally, we show that the transient relaxation dynamics ofthe reflectivity is primarily an electronic effect with negligible phononiccontribution. Our study presents the modifications of electronic properties inZrSiS using ultrashort pulses, and demonstrates the potential of this approachin creating photo-induced phases in topological quantum mater through anall-optical route.

Photoinduced Band Renormalization Effects in ZrSiS Topological Nodal-line Semimetal