Abstract
Spin precession has been used to measure the transmission time $\ensuremath{\tau}$ over a distance $L$ in a graphene sheet. Since conduction electrons in graphene have an energy-independent velocity $v$, one would expect $\ensuremath{\tau}\ensuremath{\ge}L/v$. Here we calculate that $\ensuremath{\tau}lL/v$ at the Dirac point ($=\text{charge}$ neutrality point) in a clean graphene sheet, and we interpret this result as a manifestation of the Hartman effect (apparent superluminality) known from optics.
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