Vladimir Fal’ko

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We report the self-catalysed growth of InAs nanowires (NWs) on graphite thin films using molecular beam epitaxy via a droplet-assisted technique. Through optimising metal droplets, we obtained vertically aligned InAs NWs with highly uniform diameter along their entire length. In comparison with conventional InAs NWs grown on Si (111), the graphite surface(More)
The focusing of electric current by a single p-n junction in graphene is predicted. We show that precise focusing can be achieved by fine-tuning the densities of carriers on the n-and p-sides of the junction to equal values, whereas the current distribution in junctions with different densities resembles caustics in optics. This finding can be utilized in(More)
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