Fingerprints of a position-dependent Fermi velocity on scanning tunnelling spectra of strained graphene

Abstract

Nonuniform strain in graphene induces a position dependence of the Fermi velocity, as recently demonstrated by scanning tunnelling spectroscopy experiments. In this work, we study the effects of a position-dependent Fermi velocity on the local density of states (LDOS) of strained graphene, without and with the presence of a uniform magnetic field. The variation of LDOS obtained from tight-binding calculations is successfully explained by analytical expressions derived within the Dirac approach. These expressions also rectify a rough Fermi velocity substitution used in the literature that neglects the strain-induced anisotropy. The reported analytical results could be useful for understanding the nonuniform strain effects on scanning tunnelling spectra of graphene, as well as when it is exposed to an external magnetic field.

Revised version as published in JPCM

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Cited by in corpus (8)

• Electron dynamics in strained graphene
• Effective magnetic field induced by inhomogeneous Fermi velocity in strained honeycomb structures
• Position-dependent mass Dirac equation and local Fermi velocity
• Sublattice symmetry breaking and Kondo-effect enhancement in strained graphene
• Dirac equation in curved spacetime: the role of local Fermi velocity
• Pseudo-Hermitian Dirac operator on the torus for massless fermions under the action of external fields
• So (2, 1) algebra, local Fermi velocity, and position-dependent mass Dirac equation
• Theory for strained graphene beyond the Cauchy-Born rule