Valley filtering and electronic optics using polycrystalline graphene
arXiv:1605.07777 · doi:10.1103/PhysRevLett.117.247702
Abstract
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.
5 pages, 4 figures, revised
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- Valley-Layer Coupling: A New Design Principle for Valleytronics
- Recent Advances in Two-Dimensional Metal Monochalcogenides
- Strain controlled valley filtering in multi-terminal graphene structures
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- Spontaneous Valley Spirals in Magnetically Encapsulated Twisted Bilayer Graphene
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- Electrically Tunable Spin Exchange Splitting in Graphene Hybrid Heterostructure
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- Scattering of a Dirac particle by a Berry phase domain wall
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