Machine-learning approach to understanding ultrafast carrier dynamics in the three-dimensional Brillouin zone of PtBi2

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Paulina Majchrzak - , Aarhus University (Author)
  • Charlotte Sanders - , Rutherford Appleton Laboratory, University of St Andrews (Author)
  • Yu Zhang - , Rutherford Appleton Laboratory (Author)
  • Andrii Kuibarov - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Oleksandr Suvorov - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Emma Springate - , Rutherford Appleton Laboratory (Author)
  • Iryna Kovalchuk - , Leibniz Institute for Solid State and Materials Research Dresden, Kyiv Academic University (Author)
  • Saicharan Aswartham - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Grigory Shipunov - , Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Bernd Büchner - , Clusters of Excellence ct.qmat: Complexity and Topology in Quantum Matter, Leibniz Institute for Solid State and Materials Research Dresden (Author)
  • Alexander Yaresko - , Max Planck Institute for Solid State Research (Author)
  • Sergey Borisenko - , Leibniz Institute for Solid State and Materials Research Dresden, Würzburg-Dresden Cluster of Excellence ct.qmat (Author)
  • Philip Hofmann - , Aarhus University (Author)

Abstract

Using time- and angle-resolved photoemission spectroscopy, we examine the unoccupied electronic structure and electron dynamics of the type-I Weyl semimetal PtBi2. 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⊥ broadening in the normally unoccupied states. We characterize the electron dynamics close to the Weyl points and in other parts of three-dimensional Brillouin zone using k-means, an unsupervised machine-learning technique. This reveals distinct differences - in particular, that the electron dynamics close to the Weyl points are slower than in Brillouin zone regions close to the bulk Fermi surface.

Details

Original languageEnglish
Article number013025
JournalPhysical Review Research
Volume7
Issue number1
Publication statusPublished - Jan 2025
Peer-reviewedYes

Keywords

ASJC Scopus subject areas