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    Research reveals Exotic Quantum States in Double-layer Graphene

    June 27, 2019, Categories  Physics, Technology/Electronics

    A new type of quasiparticle is discovered in graphene double-layer structure. 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. Composite fermions are capable of forming pairs, such unique interaction leads to experimental discovery of unexpected new quantum Hall phenomena.

    Researchers from Brown and Columbia Universities have demonstrated previously unknown states of matter that arise in double-layer stacks of graphene, a 2D nanomaterial. These new states, known as the fractional quantum Hall effect, arise from the complex interactions of electrons both within and across graphene layers.

    “The findings show that stacking 2D materials together in close proximity generates en...

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