Van-der-Waals layered CuInP<sub>2</sub>S<sub>6</sub> (IMAGE) Vanderbilt University Caption Van-der-Waals layered CuInP2S6 has different properties depending on the locations of copper atoms (orange spheres). Unified theory and experiment led to the discovery of two co-existing phases which are connected through a quadruple energy well whose properties can be harnessed to provide materials with new functions. Credit Oak Ridge National Laboratory, U.S. Dept. of Energy; illustration by Sabine Neumayer Usage Restrictions With appropriate credit 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.