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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 Chen^1,3, 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.