Ultrafast carrier dynamics throughout the three-dimensional Brillouin zone of the Weyl semimetal PtBi${}_2$

Abstract

Using time- and angle-resolved photoemission spectroscopy, we examine the unoccupied electronic structure and electron dynamics of the type-I Weyl semimetal PtBi${}_2$. Using the ability to change the probe photon energy over a wide range, we identify the predicted Weyl points in the unoccupied three-dimensional band structure and we discuss the effect of $k_{\perp }$ broadening in the normally unoccupied states. We characterise the electron dynamics close to the Weyl point and in other parts of three-dimensional Brillouin zone using $k$-means, an unsupervised machine learning technique. This reveals distinct differences -- in particular, dynamics that are faster in the parts of the Brillouin zone that host most of the bulk Fermi surface than in parts close to the Weyl points.

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Cited by in corpus (3)

• Interplay between inversion and translation symmetries in trigonal PtBi${}_2$
• Clustering-Enhanced Time- and Angle-Resolved Photoemission Study of LaTe${}_3$: Absence of a Photoinduced Secondary CDW in the Electronic Structure
• Mesoscale variations of chemical and electronic landscape on the surface of Weyl semimetal Co${}_3$Sn${}_2$S${}_2$ visualized by ARPES and XPS