Journal
PHYSICAL REVIEW LETTERS
Volume 102, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.096801
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Funding
- NSF
- DOE
- Welch Foundation
- NSFC
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0906025] Funding Source: National Science Foundation
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We study edge states in graphene systems where a bulk energy gap is opened by inversion symmetry breaking. We find that the edge bands dispersion can be controlled by potentials applied on the boundary with unit cell length scale. Under certain boundary potentials, gapless edge states with valley-dependent velocity are found, exactly analogous to the spin-dependent gapless chiral edge states in quantum spin Hall systems. The connection of the edge states to bulk topological properties is revealed.
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