STM-Lab (IMAGE) Technical University of Munich (TUM) Caption This photo shows Sarah Wieghold (front) and Juan Li at the scanning tunneling microscope where the photoresponsive monolayers were characterized. Credit Andreas Battenberg / TUM Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.