SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 72: Gerhard Ertl Young Investigator Award Competition

O 72.2: Vortrag

Donnerstag, 30. März 2023, 11:00–11:30, CHE 89

Interface-engineered quantum states in van der Waals heterostructures — •Felix Lüpke — Peter Grünberg Institut (PGI-3), Forschungszentrum Jülich, 52425 Jülich, Germany — Jülich Aachen Research Alliance (JARA), Fundamentals of Future Information Technology, 52425 Jülich, Germany

The assembly of van der Waals (vdW) materials into heterostructures enables the engineering of exotic quantum states by interface effects such as moiré and proximity. Scanning tunneling microscopy (STM) has become an important tool to study the properties of such heterostructure, because it gives direct access to the resulting structural and electronic properties. While the possibilities to combine different vdW materials in Lego-like fashion are virtually infinite, the fabrication of samples with atomically clean surfaces, as required for STM, was typically limited to air-stable or epitaxially grown samples, which drastically diminishes the engineering capabilities. To address this problem, we have developed a novel dry-transfer flip fabrication technique, which allows the preparation and STM study of heterostructures with atomically clean surfaces and interfaces and without exposure to air. In my talk, I will summarize our developments in heterostructure fabrication and will show results of proximity-induced superconductivity in topological insulator WTe₂, interlayer interactions in twisted bilayer WTe₂, phonon gap supported tunneling and interfacial electric fields in Fe₃GeTe₂ heterostructures, and quantum dot lattices in NbSe₂ heterostructures.