Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 25: Focus Session: Atomic-Scale Characterization of Correlated Ground States in Epitaxial 2D Materials

O 25.1: Topical Talk

Dienstag, 6. September 2022, 10:30–11:00, H2

Designer electronic states in van der Waals heterostructures — •Peter Liljeroth — Department of Applied Physics, Aalto University, PO Box 15100, 00076 Aalto, Finland

Van der Waals (vdW) heterostructures provide unique opportunities for engineering exotic quantum states not found in naturally occurring materials. I will highlight this approach by describing our recent results on realizing topological superconductivity [1,2] and artificial heavy fermion systems in vdW heterostructures [3]. We use molecular-beam epitaxy (MBE) and low-temperature scanning tunneling microscopy (STM) for the sample growth and characterization. Topological superconductivity can be realized by combining ferromagnetic CrBr₃ on a superconducting NbSe₂ substrate [1,2], which brings together the necessary ingredients for topological superconductivity (out of plane ferromagnetism, Rashba-type spin-orbit interactions and s-wave superconductivity). On the other hand, the building blocks of heavy fermion systems - Kondo coupling between a lattice of localized magnetic moments and mobile conduction electrons - can be mimicked in a 1T-TaS₂ / 1H-TaS₂ heterostructure. These examples highlight the versatility of vdW heterostructures in realizing quantum states that are difficult to find and control in naturally occurring materials.

References: [1] S. Kezilebieke et al. Nature 588, 424 (2020). [2] S. Kezilebieke et al. Nano Lett. 22, 328 (2022). [3] V. Vaňo et al. Nature 599, 582 (2021).