Two layers of graphene can be brought together at an extremely close distance of just one nanometre – ten times closer than is possible for other, more traditional, materials. This is the new finding from researchers at the University of Manchester, led by Leonid Ponomarenko, who have observed very strong “Coulomb drag” in the double-layer graphene system………….
http://nanotechweb.org/cws/article/tech/55186
Magnetodrag at charge neutrality