  We have studied a single vortex with the staggered flux (SF) core based on
the SU(2) slave-boson theory of high $T_c$ superconductors. We find that
whereas the center in the vortex core is a SF state, as one moves away from the
core center, a correlated staggered modulation of the hopping amplitude $\chi$
and pairing amplitude $\Delta$ becomes predominant. We predict that in this
region, the local density-of-states (LDOS) exhibits staggered modulation when
measured on the bonds, which may be directly detected by STM experiments.
