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We demonstrate that edge currents develop in active chiral matter -- composedof spinning disk-shaped grains with chirally arranged tilted legs confined in acircular vibrating chamber -- due to boundary shielding over a wide range ofdensities corresponding to a gas, fluid, and crystal. The edge currents arethen shown to increasingly drive circulating bulk flows with area fraction$\phi$ due to increasing spin-coupling between neighbors mediated by frictionalcontacts, as percolating clusters develop. Edge currents are observed even inthe dilute limit. While, at low $\phi$, the average flux vanishes except withina distance of a single particle diameter of the boundary, the penetration depthgrows with increasing $\phi$ till a solid body rotation is achievedcorresponding to the highest packing, where the particles are fully caged withhexagonal order and spin in phase with the entire packing. A coarse-grainedmodel, based on the increased collisional interlocking of the particles with$\phi$ and the emergence of order, captures the observed flow fields.

Density Mediated Spin Correlations Drive Edge to Bulk Flow Transition in Active Chiral Matter