Journal
PHYSICAL REVIEW LETTERS
Volume 106, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.176802
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Funding
- NSF of China
- MOST
- Swedish International Development Cooperation Agency (SIDA)
- Belgian Science Policy (IAP)
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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-Hanchen 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.
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