Valley Filtering and Electronic Optics Using Polycrystalline Graphene

Nguyen, Viet-Hung;Dechamps, Samuel;Dollfus, P.;Charlier, Jean-Christophe
(2016) Physical Review Letters — Vol. 117, n° 24, p. 247702 (2016)

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In this Letter, both the manipulation of valley-polarized currents and the optical-like behaviors of Dirac fermions are theoretically explored in polycrystalline graphene. When strain is applied, the misorientation between two graphene domains separated by a grain boundary can result in a mismatch of their electronic structures. Such a discrepancy manifests itself in a strong breaking of the inversion symmetry, leading to perfect valley polarization in a wide range of transmission directions. In addition, these graphene domains act as different media for electron waves, offering the possibility to modulate and obtain negative refraction indexes.
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Nguyen, V.-H., Dechamps, S., Dollfus, P., & Charlier, J.-C. (2016). Valley Filtering and Electronic Optics Using Polycrystalline Graphene. Physical Review Letters, 117(24), 247702. https://doi.org/10.1103/PhysRevLett.117.247702 (Original work published 2016)