Pseudomagnetic fields and ballistic transport in a suspended graphene   sheet
  We study a suspended graphene sheet subject to the electric field of a gate underneath. We compute the elastic deformation of the sheet and the corresponding effective gauge field, which modifies the electronic transport. In a clean system the two-terminal conductance of the sample is reduced below the ballistic limit and is almost totally suppressed at low carrier concentrations in samples under tension. Residual disorder restores a small finite conductivity. 
M. M. Fogler, F. Guinea and M. I. Katsnelson