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HL: Fachverband Halbleiterphysik

HL 60: Focus Session: Physics of the van der Waals Magnetic Semiconductor CrSBr II (joint session HL/MA)

HL 60.1: Hauptvortrag

Freitag, 21. März 2025, 09:30–10:00, H17

Constructing Artificial Matter in the Electron Microscope - Atomic Fabrication at Scale in CrSBr — •Julian Klein — Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, 02319 MA, USA

The ability to control the arrangement of individual atoms has transcended naturally occurring configurations of matter, enabling experimental breakthroughs in quantum physics. I will show how we can now use scanning transmission electron microscopy to construct artificial atomic arrangements at scale and demonstrate it with the layered magnetic quasi-1D semiconductor CrSBr. By developing strategies to position the electron beam with picometer precision and perform rapid, targeted beam actions, we achieve deterministic control over the movement of Cr atoms in space and time. With this capability, we selectively steer Cr atoms into interstitial positions, forming localized quantum states while simultaneously monitoring atomic movements in real time with microsecond resolution. Fully automating the electron microscope enables us to construct ordered arrays of Cr interstitial superlattices atom by atom as well as nonperiodic structures, spanning hundreds of locations over tens of nanometers, all within minutes. Our results show that atomic fabrication at scale in the electron microscope is now a reality, unlocking unprecedented opportunities to construct quantum defects and phases, atom by atom, in the solid state, that extend over macroscopic length scales.

Keywords: CrSBr; Atomic Fabrication; Electron Microscopy; Defects; Quantum Matter