Correlated Artificial Lattices Realized Through Patterned Adatoms, Impurities, and Vacancies in 2D Hosts with Malte Rösner

Artificial lattices hold high promises as model platforms to control and study correlation effects beyond the capabilities of highest-level theoretical descriptions. In this talk I will discuss various pathways to create such correlated artificial lattices via patterned “imperfections” in 2D host systems and I will show how state-of-the-art condensed matter theory can help to understand and guide the artificial lattice fabrication.

I will focus on two new platforms based on tip-patterned Cs adatoms on the InSb(110) surface [1] and Cr intestinal defects positioned by transmission electron microscopy in CrSBr hosts [2]. By combining highest precision scanning probe and transmission electron microscopy experiments with state-of-the-art ab initio theory we were able to microscopically understand the fundamental building blocks of these systems, allowing us to emulate various Hamiltonians including correlated ones.

[1] Quantum simulator to emulate lower-dimensional molecular structure, E. Sierda, X. Huang, D.I. Badrtdinov, B. Kiraly, E.J. Knol, G.C. Groenenboom, M.I. Katsnelson, M. Rösner, D. Wegner, and A.A. Khajetoorians, Science 380, 1048 (2023)
[2] Mesoscale atomic engineering in a crystal lattice, J. Klein, K. M. Roccapriore, M. Weile, S. Grytsiuk, A. R. Lupini, Z. Sofer, D. Pashov, M. van Schilfgaarde, S. Acharya, M. Rösner & F. M. Ross, Nature 653, 715 (2026)

This lecture was made possible by the William C. Ferguson Fund.