Scientists are investigating 2D materials, notably twisted tungsten disulfide (WS2), which exhibit unique electronic properties when layered at specific angles. Research led by Antonija Grubišić-Čabo from the University of Groningen found that stacking two WS2 sheets at a critical angle of 4.4 degrees, which theoretical models predicted would lead to collective electron behavior and potentially superconductivity, yielded unexpected results. Contrary to predictions, the experiments indicated that the twisted bilayer tends to revert to large, stable, untwisted regions, suggesting that atom interactions in the bilayer are more complex than previously thought.
First author Giovanna Feraco noted that this “relaxation” challenges existing assumptions about the properties of 2D materials. The study emphasizes the significance of understanding how different structural regions within the bilayer develop and their varying properties. This research not only refines the theoretical frameworks surrounding 2D materials but also has implications for advancing electronics technologies. By revealing the unexpected behaviors of WS2, scientists can better predict and manipulate the electronic characteristics of 2D structures, ultimately paving the way for innovations in electronic devices.
