Optical Coupling to Quantum Hall States (IMAGE) ETH Zurich Department of Physics Caption White-light reflectivity spectra recorded around a filling factor of 2/3, revealing clear signatures of optical coupling to the quantum Hall state. Credit ETH Zurich/D-PHYS Patrick Knüppel 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.