Berlin 2024 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 23: Ultrafast Electron Dynamics at Surfaces and Interfaces III

O 23.7: Vortrag

Dienstag, 19. März 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