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Home»News»2D materials with ‘twist’ show unexpected electronic behavior that defy theoretical predictions
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2D materials with ‘twist’ show unexpected electronic behavior that defy theoretical predictions

January 7, 2025No Comments2 Mins Read
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2D materials with ‘twist’ show unexpected electronic behavior that defy theoretical predictions
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This picture shows first author Giovanna Feraco (Zernike Institute for Advanced Materials, University of Groningen, the Netherlands), operating an Ultra-High Vacuum (UHV) system at a synchrotron facility. Credit: University of Groningen

In the search for new materials that can enable more efficient electronics, scientists are exploring so-called 2D materials. These are sheets of just one atom thick, that may have all kinds of interesting electronic properties. If two sheets are placed on top of each other at specific angles, this may lead to new properties such as superconductivity. University of Groningen materials scientist Antonija Grubišić-Čabo and her colleagues studied such a “twisted” material and discovered that it defied theoretical predictions.

The work is published in the journal Physical Review Materials.

Together with colleagues from Poland, Germany, France, and Italy, Grubišić-Čabo and her team studied sheets of a 2D material called tungsten disulfide. According to theoretical predictions, when two sheets, (called a bilayer), are stacked at an angle of 4.4 degrees, the electrons within the material should show a collective behavior.

“And when they are so closely connected, their collective behavior can create new, fascinating effects,” says Giovanna Feraco, first author of the study.

However, she did not see this collective behavior in experiments, which can be explained by the interactions between atoms in the bilayer. The twist normally enables these interactions.

“But by studying the electronic structure in the bilayer, we discovered that this material tends to “relax” into large, untwisted regions,” Feraco explains. In technical terms, the twisted bilayer partially reverts to a lower-energy, untwisted configuration.

This finding highlights the importance of understanding how the two sheets of the bilayer form different regions with varying properties. The study has also enhanced scientists’ ability to predict and manipulate the behavior of 2D structures, paving the way for future applications in different types of electronics.

Materials with a 'twist' show unexpected electronic behaviour
This illustration shows the formation of relaxed domains within the twisted bilayer WS2. Credit: University of Groningen

Provided by
University of Groningen


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