National University of Singapore (NUS) physicists have developed a technique to precisely control the alignment of supermoiré lattices by using a set of golden rules, paving the way for the advancement of next generation moiré quantum matter.
which are layered materials are overlaid on each other, the atoms in the two structures do not line up perfectly, creating a pattern of interference fringes, called a moiré pattern.
A research team led by Professor Ariando from the Department of Physics, NUS, developed a technique and successfully realized the controlled alignment of the hBN/graphene/hBN supermoiré lattice. This technique allows for the precise arrangement of two moiré patterns, one on top of the other. Meanwhile, the researchers also formulated the"Golden Rule of Three" to guide the use of their technique for creating supermoiré lattices.
The researchers use a 30-degree rotation technique at the start to control the alignment of the top hBN and graphene layers. Then they use a flip-over technique to control the alignment of the top hBN and bottom hBN layers. Based on these two methods, they can control the lattice symmetry and tune the band structure of the graphene supermoiré lattice. They have also shown that the neighboring graphite edge can act as a guide for the stacking alignment.
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