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Veselago Lens for Electrons: Focusing and Caustics in Graphene p-n Junctions | | Vadim V. Cheianov
; Vladimir Fal’ko
; B.L. Altshuler
; | | Date: |
15 Mar 2007 | | Journal: | Science, 315, p 1252 (2007) | | Subject: | Mesoscopic Systems and Quantum Hall Effect | | Abstract: | The focusing of electric current by a single extit{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 the engineering of electronic lenses and focused beam-splitters using gate-controlled extit{n-p-n} junctions in graphene-based transistors. | | Source: | arXiv, cond-mat/0703410 | | Services: | Forum | Review | PDF | Favorites | |
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