The research is published in the journal Nature Physics. “In terms of materials engineering, this work shows that these layered systems could be viable in creating new types of electronic devices that take advantage of these new quantum Hall states.” “The findings show that stacking 2D materials together in close proximity generates entirely new physics,” said Jia Li, assistant professor of physics at Brown, who initiated this work while a post-doc at Columbia working with Cory Dean, professor of physics, and Jim Hone, professor of mechanical engineering. These new states, known as the fractional quantum Hall effect, arise from the complex interactions of electrons both within and across graphene layers. Researchers from Brown and Columbia Universities have demonstrated previously unknown states of matter that arise in double-layer stacks of graphene, a two-dimensional nanomaterial. (Image: Michelle Miller and Jia Li/Brown University) Composite fermions are capable of forming pairs, such unique interaction leads to experimental discovery of unexpected new quantum Hall phenomena. This so-called composite fermion consists of one electron and two different types of magnetic flux, illustrated as blue and gold colored arrows in the figure. A new type of quasiparticle is discovered in graphene double-layer structure.
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