Graphene Sandwich Accelerates Electrons ⚡ экспресс
Graphene allows precise control of charge carrier density via the field effect, making it an ideal platform for studying electronic interactions. However, sample inhomogeneities often limit access to the low-density regime where these interactions dominate. This work demonstrates a significant reduction in external disorder through an architecture of two graphene layers separated by an ultra-thin layer of hexagonal boron nitride. Mutual screening of the layers suppresses scattering from random Coulomb potentials, leading to record-high quantum mobility. Shubnikov–de Haas oscillations are detected in magnetic fields below 1 mT, the integer quantum Hall effect appears at 0.002 T, and at 2 T a fractional quantum Hall plateau is observed. These results open the door to investigating strongly correlated electron phases in graphene heterostructures.
Graphene is a carbon sheet just one atom thick, a fantastic conductor. But its surface is crinkly, like a wrinkled tablecloth that hasn't been ironed. Scientists built a 'sandwich': two of these sheets pressed together with a non-conductive spacer in between. They iron out each other's folds—like two halves of a sandwich making the surface perfectly even. Inside this atomically flat sandwich, electrons glide without a hitch.
But the real magic: in this ultrapure structure, electrons start to 'divide'. Their collective behavior creates particles with just one-third of the usual charge. It's not a trick—it's a key to the deep nature of matter and a step toward tomorrow's electronics.
🎯 Electrons in the graphene sandwich behave as if each split into three parts—this quantum phenomenon opens the door to particles with exotic properties.