The latest research from the labs of James Hone and Cory Dean demonstrates a new way to tune the properties of two-dimensional (2D) supplies just by adjusting the twist angle between them. The researchers built the devices consisting of monolayer graphene that have encapsulated between two crystals of boron nitride, and by changing the relative angle between the layers, they were able to create the multiple moiré patterns.
The Moiré patterns are of high interest to condensed matter physicists and materials scientists who use them to vary or generate new digital materials properties. These patterns can be formed by aligning the boron nitride (BN, an insulator) and graphene crystals. When these honeycomb lattices of atoms are near alignment, they create a moiré superlattice, a nanoscale interference sample that additionally seems like a honeycomb. This moiré superlattice alters the quantum mechanical setting of the conducting electrons within the graphene, and subsequently can be utilized to program essential changes within the noticed digital properties of the graphene.
Thus far, most research on the consequences of moiré superlattices in graphene-BN methods has checked out a single interface (with both the highest or backside floor of the graphene thought-about, however not each). Nevertheless, research revealed by Hone and Dean’s final yr demonstrated that whole rotational management over one of many two interfaces was potential inside a single machine.
By designing a tool that has persistent alignment at one interface, and tunable adjustment on the different, the Columbia staff has now been capable of examining the consequences of multiple moiré superlattice potentials on a layer of graphene.