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O: Fachverband Oberflächenphysik
O 23: Ultrafast Electron Dynamics at Surfaces and Interfaces III
O 23.7: Talk
Tuesday, March 19, 2024, 12:00–12:15, MA 041
Three-dimensional electron dynamics in PtBi2 — Paulina Majchrzak1, •Charlotte Sanders2, Yu Zhang2, Andrii Kuibarov3, Oleksandr Suvorov3, Emma Springate2, Bernd Büchner3, Alexander N. Yaresko4, Sergey Borisenko3, and Philip Hofmann1 — 1Department of Physics & Astronomy, Interdisciplinary Nanoscience Centre, Aarhus University, 8000 Aarhus C, Denmark — 2Central Laser Facility, STFC Rutherford Appleton Laboratory, Research Complex at Harwell, Harwell, OX11 0QX, UK — 3Leibniz IFW Dresden, Helmholtzstr.. 20, 01069, Dresden, Germany — 4Max-Planck-Institute for Solid State Research, D-70569, Stuttgart, Germany
Interplay between the three-dimensionally dispersing Weyl states of trigonal PtBi2 and complex many-body physics at the surface has been the subject of an intriguing recent study [1]. Key to these interesting physics is a set of Weyl points in conduction band states that are not occupied at room temperature and therefore cannot be directly probed by traditional methods of angle-resolved photoemission spectroscopy (ARPES). Using pump-probe time-resolved ARPES at the UK Artemis facility, along with the capability at Artemis for photon-energy scanning, we have been able to investigate three-dimensional dynamics in the conduction band of this interesting material, and to compare the results to theory predictions relating to the quasiparticle band dispersion and topologically non-trivial states. [1] arXiv:2305.02900 [cond-mat.supr-con]
Keywords: Weyl; PtBi2; pump-probe; ARPES