Regensburg 2022 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 21: Poster Monday: Topology and Symmetry-Protected Materials
O 21.4: Poster
Montag, 5. September 2022, 18:00–20:00, P4
Investigation of the V/TI interface by TEM and ARPES — •Xiao Hou1, Max Vaßen-Carl2, Mohammed Qahosh1, Xiankui Wei3, Peter Schüffelgen2, Claus Michael Schneider1, and Lukasz Plucinski1 — 1PGI-6, Forschungszentrum Jülich, Germany — 2PGI-9, Forschungszentrum Jülich, Germany — 3ERC-2, Forschungszentrum Jülich, Germany
Topological insulators (TIs) can host so-called Majorana zero modes (MZM) when proximitized with superconductors (SCs). Such a TI/SC system is a promising platform for realizing fault-tolerant quantum computers by employing braiding of the Majorana zero modes [1], in which a sharp interface between SC and TI is one of the prerequisites to realize the Majorana mode [2-3]. Here, vanadium(V) - (Bi0.08Sb0.92)2Te3 is chosen as the SC/TI system.
We use advanced transmission electron microscopy (TEM) and angle-resolved photoemission spectroscopy (APRES) to study structural and electronic properties of the V/TI interfaces. High-resolution TEM and high-angle annular dark-field imaging provide details on crystallinity and atomic arrangements associated with various types of structural defects, while the energy-dispersive X-ray spectroscopy reveals the elemental distribution and also the interfacial interdiffusion. The band alignments between TI and V are studied using ARPES on ultrathin V films deposited on vacuum-transferred TI surfaces.
[1] B. Jäck et al. Science 364.6447 (2019). [2] P. Schüffelgen et al. Journal of crystal growth 477 (2017). [3] M. Bai et al. Physical Review Materials 4.9 (2020).