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Low magnetic field scanning tunneling spectroscopy of individual Abrikosovvortices in heavily overdoped Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ unveils aclear d-wave electronic structure of the vortex core, with a zero-biasconductance peak at the vortex center that splits with increasing distance fromthe core. We show that previously reported unconventional electronicstructures, including the low energy checkerboard charge order in the vortexhalo and the absence of a zero-bias conductance peak at the vortex center, aredirect consequences of short inter-vortex distance and consequent vortex-vortexinteractions prevailing in earlier experiments.

Wang-MacDonald d-wave vortex cores observed in heavily overdoped Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$