Physicists have figured out how to "stitch" individual metal atoms into a sheet of carbon to build custom materials for quantum computers.
April 10, 2026
Original Paper
Substitutional Mn dimers in graphene created by ultralow-energy cluster-ion implantation
SSRN · 6552006
The Takeaway
Scientists have long been able to swap out single atoms in a material, but placing exact pairs of atoms (dimers) in specific spots was nearly impossible. This new method allows for the precise placement of multi-atom clusters, which act like tiny, stable building blocks for next-generation quantum electronics.
From the abstract
Despite advances in single-atom doping, the controlled assembly of multi-atom defects in 2D materials remains difficult, limiting the ability to tailor their electronic, magnetic, or catalytic functionality. Here, we demonstrate that ultralow-energy (82 eV) implantation of mass-selected Mn2 cluster ions into monolayer graphene enables the formation of substitutional Mn dimers. Low-temperature scanning tunneling microscopy and spectroscopy, supported by density-functional theory calculations, rev