Project Details
Projekt
Creating many-body states in two-dimensional van-der-Waals heterostructures by design
Applicant
Dr. Wouter Raymond Jolie
Subject Area
Experimental Condensed Matter Physics
Term
since 2024
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 535290457
A plethora of many-body ground states can emerge when interfacing correlated two-dimensional materials, depending on the electronic properties of the two sheets, as well as on the type of coupling between them. The goal of this proposal is to create van-der-Waals heterostructures in which the top layer (MoS2) hosts a fully accessible localized spin, which couples to the correlated quasiparticles in the bottom layer. This interaction will create various many-body states which will be analyzed using scanning tunneling microscopy and spectroscopy at low temperatures and in a magnetic field. When the quasiparticles in the bottom layer are described by Fermi liquid theory, the coupling to the spin in the top layer induces spin fluctuations, which creates a Kondo resonance in the vicinity of the localized spin. In contrast, when the quasiparticles condense to Cooper pairs with a quasiparticle gap in the spectral function, Yu-Shiba-Rusinov (YSR) bound states emerge inside this superconducting gap close to the Fermi energy. Lastly, exotic magnetic ground states are proposed when the localized spin couples to a quantum spin liquid. The experimental results will be corroborated by state-of-the-art theoretical models, which enable us to gain insights into the microscopic interaction present in such systems.
DFG Programme
Priority Programmes
Co-Investigator
Professor Dr. Thomas Werner Michely
