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## Main Question or Discussion Point

Hi,

In the book of Hanson, the dispersion relationship for a graphene near K points are approximated by

and then it is said that, since this is similar to the energy of a photon

it is argued that electrons at K point behave as massless like photons. Is this right? Is this the advantage of graphene that, electrons have high mobility due to being massless?

Cheers,

In the book of Hanson, the dispersion relationship for a graphene near K points are approximated by

**E=hbar.vF.k**where hbar-> reduced Planck's constant vF->Fermi velocity k-> wave numberand then it is said that, since this is similar to the energy of a photon

**E=hbar.c.k**where c-> speed of lightit is argued that electrons at K point behave as massless like photons. Is this right? Is this the advantage of graphene that, electrons have high mobility due to being massless?

Cheers,