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We consider a mixture of active and passive run-and-tumble disks in aninhomogeneous environment where only half of the sample contains quencheddisorder or pinning. The disks are initialized in a fully mixed state ofuniform density. We identify several distinct dynamical phases as a function ofmotor force and pinning density. At high pinning densities and high motorforces, there is a two step process initiated by a rapid accumulation of bothactive and passive disks in the pinned region, which produces a large densitygradient in the system. This is followed by a slower species phase separationprocess where the inactive disks are shepherded by the active disks into thepin-free region, forming a non-clustered fluid and producing a more uniformdensity with species phase separation. For higher pinning densities and lowmotor forces, the dynamics becomes very slow and the system maintains a strongdensity gradient. For weaker pinning and large motor forces, a floatingclustered state appears and the time averaged density of the system is uniform.We illustrate the appearance of these phases in a dynamic phase diagram.

Active Matter Shepherding and Clustering in Inhomogeneous Environments