Berlin 2024 – scientific programme

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O: Fachverband Oberflächenphysik

O 109: Focus Session: Proximity Effects in Epitaxial Graphene II

O 109.1: Topical Talk

Friday, March 22, 2024, 10:30–11:00, MA 141

Heavy fermion quantum matter and topological superconductivity in artificial van der Waals heterostructures — •Jose Lado — Department of Applied Physics, Aalto University, Finland

Van der Waals materials provide a versatile platform for realizing a variety of emergent quantum states, including magnetic, correlated, and superconducting states, among others. Here we show that twisted van der Waals heterostructures provide a natural materials platform for realizing heavy fermion quantum materials [1,2] and topological moire superconductors [3,4]. We will discuss how a full heavy-fermion phase diagram can be realized in twisted graphene multilayers [1]. We will further show how heavy-fermion quantum matter can be experimentally realized in a bilayer made of two-dimensional materials [2]. We experimentally demonstrate [3] the emergence of a moire Yu-Shiba-Rusinov electronic structure stemming from the twist between the two van der Waals materials leading to a topological superconducting state. We will furthermore establish [4] a strategy to engineer highly tunable topological superconductivity in twisted graphene bilayers by exploiting a combination of moire patterns and proximity effects to 2D materials. Our results show that moire physics provides a powerful strategy to engineer ultra-clean heavy-fermion materials and artificial topological superconductors using van der Waals materials.

[1] Phys. Rev. Lett. 127, 026401 (2021), [2] Nature 599, 582*586 (2021), [3] Nano Lett. 2022, 22, 1, 328-333 (2022), [4] arXiv:2307.04605 (2023)

Keywords: topological superconductivity; heavy fermion materials; graphene multilayers; van der Waals heterostructures