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The three layer moiré patterns change the graph's electronic properties – ScienceDaily

Combining an atomically thin graph and a boritridide layer at a slightly rotated angle changes their electrical properties. Physicists at the University of Basel have for the first time shown that the combination with a third layer can lead to new material properties even in a three-layer pulp of carbon and boron nitride. This significantly increases the number of potential synthetic materials, reports scientists in the scientific journal Nano Letters . Last year, scientists in the United States caused a big movement when they showed that rotating two stacked graph layers by a "magic" angle of 1.1 degrees turning the graph superconducting – a striking example of how the combination of atomically thin materials can produce brand new electrical properties. Precision adjustment Researchers from the Swiss nanoscience institute and the Department of Physics at the University of Basel have now taken this concept a step further. They placed a layer of the graph between two boron nitride layers, which often serve to protect the sensitive carbon structure. By doing so, they adjusted the bearings very precisely with the graph lattice of the graph. The effect observed by physicists in Professor Christian Schönenberger team is generally known as moiré pattern: when two common patterns are superimposed, a new pattern results with a larger periodic lattice. New three-layer superlattice Lujun Wang, a member of the SNI doctoral school and scholars of the Schönenberger team, also observed the effects of this type of superlattice when he combined layers of boron nitride and graphene.…

Combining an atomically thin graph and a boritridide layer at a slightly rotated angle changes their electrical properties. Physicists at the University of Basel have for the first time shown that the combination with a third layer can lead to new material properties even in a three-layer pulp of carbon and boron nitride. This significantly increases the number of potential synthetic materials, reports scientists in the scientific journal Nano Letters .

Last year, scientists in the United States caused a big movement when they showed that rotating two stacked graph layers by a “magic” angle of 1.1 degrees turning the graph superconducting – a striking example of how the combination of atomically thin materials can produce brand new electrical properties.

Precision adjustment

Researchers from the Swiss nanoscience institute and the Department of Physics at the University of Basel have now taken this concept a step further. They placed a layer of the graph between two boron nitride layers, which often serve to protect the sensitive carbon structure. By doing so, they adjusted the bearings very precisely with the graph lattice of the graph.

The effect observed by physicists in Professor Christian Schönenberger team is generally known as moiré pattern: when two common patterns are superimposed, a new pattern results with a larger periodic lattice.

New three-layer superlattice

Lujun Wang, a member of the SNI doctoral school and scholars of the Schönenberger team, also observed the effects of this type of superlattice when he combined layers of boron nitride and graphene. The atoms are arranged hexagonally in all layers. If stacked on top of each other, larger regular patterns with a size depending on the angle between layers occur. It had already been found that this works with a two-layer combination of the graphene and boron nitride, but the effects due to a second boron nitride layer had not yet been found.

When the physicists from Basel experimented with three layers, two superlattices were formed between the graph and the upper and lower borititride layers, respectively. The overlay of all three layers created an even larger superstructure than possible with only one bearing.

Researchers are very interested in these types of synthetic materials, because the different moiré patterns can be used to alter or artificially produce new electronic material properties.

“To put it simply, the atom pattern determines the behavior of the electrons in a material, and we combine different naturally occurring patterns to create new synthetic materials,” explains Dr. Andreas Baumgartner, who supervised the project. “We have now discovered effects in these tailor-made electronic devices that conform to a three-layer building,” he adds. Story Source:

Materials provided by University of Basel . Note! The content can be edited for style and length.

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