Space dependent Fermi velocity in strained graphene

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2012
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American Physical Society
Abstract
We investigate some apparent discrepancies between two different models for curved graphene: the one based on tight-binding and elasticity theory, and the covariant approach based on quantum field theory in curved space. We demonstrate that strained or corrugated samples will have a space-dependent Fermi velocity in either approach that can affect the interpretation of local probe experiments in graphene. We also generalize the tight-binding approach to general inhomogeneous strain and find a gauge field proportional to the derivative of the strain tensor that has the same form as the one obtained in the covariant approach.
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De Juan, F., Sturla, M., & Vozmediano, M. A. H. (2012). Space dependent fermi velocity in strained graphene. Physical Review Letters, 108(22), 227205. http://dx.doi.org/10.1103/PhysRevLett.108.227205
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© 2012 American Physical Society.
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Article