Moiré Superlattice (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption The twist angle formed between atomically thin layers of tungsten disulfide and tungsten diselenide acts as a "tuning knob," turning ordinary semiconductors into an exotic quantum material. Credit Berkeley Lab Usage Restrictions Credit Berkeley Lab 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.