  Vortex is a universal and significant phenomenon that has been known for
centuries. However, creating vortices to the atomic limit has remained elusive
because that the characteristic length to support a vortex is usually much
larger than the atomic scale. Very recently, it was demonstrated that
intervalley scattering induced by the single carbon defect of graphene leads to
phase winding over a closed path surrounding the defect. Motivated by this, we
demonstrate, in this Letter, that the single carbon defects at A and B
sublattices of graphene can be regarded as pseudospin-mediated atomic-scale
vortices with angular momenta l = +2 and -2, respectively. The quantum
interferences measurements of the interacting vortices indicate that the
vortices cancel each other, resulting in zero total angular momentum, in the
|A| = |B| case, and they show aggregate chirality and angular momenta similar
to a single vortex of the majority in the |A| not equal to |B| case, where |A|
(|B|) is the number of vortices with angular momenta l = +2 (l = -2).
