Tuning a circular p–n junction in graphene from quantum confinement to optical guiding – Rutgers University-New Brunswick


The photon-like propagation of the Dirac electrons in graphene, together with its record-high electronic mobility1,2,3, can lead to applications based on ultrafast electronic response and low dissipation4,5,6. However, the chiral nature of the charge carriers that is responsible for the high mobility also makes it difficult to control their motion and prevents electronic switching. Here, we show how to manipulate the charge carriers by using a circular p–n junction whose size can be continuously tuned from the nanometre to the micrometre scale7,8. The junction size is controlled with a dual-gate device consisting of a planar back gate and [