Ultrafast hot carrier dynamics of ZrTe${}_5$ from time-resolved optical reflectivity

Abstract

We investigate the hot carrier dynamics of ZrTe${}_5$ by ultrafast time-resolved optical reflectivity. Our results reveal a phonon-mediated across-gap recombination, consistent with its temperature-dependent gap nature as observed previously by photoemission. In addition, two distinct relaxations with a kink feature right after initial photoexcitation are well resolved, suggesting the complexity of electron thermalization process. Our findings indicate that correlated many-body effects play important role for the transient dynamics of ZrTe${}_5$.

arXiv comment5 pages, 4 figures

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• Propagation of longitudinal acoustic phonons in ZrTe${}_5$ exposed to a quantizing magnetic field
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