Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 9: Ultrafast Electron Dynamics at Surfaces and Interfaces 2
O 9.2: Vortrag
Montag, 5. September 2022, 15:15–15:30, H3
Time- and angle-resolved photoemission study of magnetic topological insulators MnBi2Te4 and MnBi4Te7 — •Paulina Majchrzak1, Klara Volckaert1, Deepnarayan Biswas1, Denny Puntel2, Wibke Bronsch2, Federico Cilento2, Xing-chen Pan3, Yong Chen1,3, and Søren Ulstrup1 — 1Dept. of Physics and Astronomy, Aarhus University, DK — 2Elettra - Sincrotrone Trieste, IT — 3Advanced Institute for Materials Research, Tohoku University, JP
Van der Waals heterostructures comprising layers of intrinsically antiferromagnetic topological insulator (TI) MnBi2Te4 and non-magnetic TI Bi2Te3 offer a rich toolbox for engineering exotic quantum phenomena. Magnetic and transport properties of these materials are strongly affected by the interplay between bulk and surface states with divergent topologies resulting from hybridisation between the top layers.
Here, we disentangle those complex interactions in the time domain with TR-ARPES. We discuss the interband dynamics in bulk and surface states as a function of stacking and surface terminations for MnBi2Te4 and MnBi4Te7. Our results fill a knowledge gap in understanding of interlayer coupling in MnBi2Te4-based heterostructures.