Published in
American Physical Society, Physical Review Letters, 17(106)
DOI: 10.1103/physrevlett.106.176802
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Valley-dependent Brewster angles and Goos-Hanchen effect in strained graphene
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Abstract
We demonstrate theoretically how local strains in graphene can be tailored to generate a valley polarized current. By suitable engineering of local strain profiles, we find that electrons in opposite valleys (K or K') show different Brewster-like angles and Goos-Ḧanchen shifts, exhibiting a close analogy with light propagating behavior. In a strain-induced waveguide, electrons in K and K' valleys have different group velocities, which can be used to construct a valley filter in graphene without the need for any external fields. ; Comment: 5 pages, 4 figures