Scientists successfully turned a single molecule's light on and off by moving just one atom inside it.
April 1, 2026
Original Paper
Atomically Reconfigurable Single-Molecule Optoelectronics
arXiv · 2603.29286
The Takeaway
Using an ultra-precise microscope, researchers shifted a single metal atom at the center of a molecule up and down. This tiny mechanical movement acts as a perfect light switch at the molecular scale, which is a major step toward creating the world's smallest possible electronics and quantum computers.
From the abstract
Deterministic control of excitonic properties is key to advancing nanoscale optoelectronic and quantum technologies and to understanding diverse physical, optical, chemical, and biological phenomena. At the molecular scale, these properties can be tuned through chemical modification, local-environment influence or charge-state manipulation. Yet, direct control of a molecule's transition dipole moment and its resulting light emission via atomic-scale structural modification has remained elusive.