  Persistent currents can arise in normal-metal rings due to a magnetic flux
threading the ring in equilibrium. However, can persistent currents arise in
absence of magnetic flux in the same normal-metal rings? Yes they can but in a
non-equilibrium set-up. This is known as current magnification. In this work we
show that current magnification can be seen in graphene nanorings. Further,
graphene can have electrons polarized with a valley quantum number. Electron
scattering between valleys can have a non-trivial effect on these persistent
currents including inducing a sign change and generating them for parameters
where none existed to begin with.
