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Suspensions of Active Brownian Particles (ABP) undergo motility induced phaseseparation (MIPS) over a wide range of mean density and activity strength [1],even in the absence of an explicit attraction. Negative values of themechanical surface tension have been reported, from the total forces across theinterface, while the stable fluctuations of the interfacial line would beinterpreted as a positive capillary surface tension [2], while in equilibriumliquid surfaces these two magnitudes are equal. We present here the analysis of2D-ABP interfaces in terms of the intrinsic density and force profiles,calculated with the particle distance to the instantaneous interfacial line.Our results provide a new insight in the origin of the MIPS from the localrectification of the random active force on the particles near the interface.As it had been pointed, that effect acts as an external potential [3] thatproduces a pressure gradient across the interface, so that the mechanicalsurface tension of the MIPS cannot be described as that of equilibriumcoexisting phases; but our analysis shows that most of that effect comes fromthe tightly caged particles at the dense (inner) side of the MIPS interface,rather than from the free moving particles at the outer side that collide withthe dense cluster. Moreover, a clear correlation appears between the decay ofthe hexatic order parameter at the dense slab and the end of the MIPS as thestrength of the active force is lowered. We test that with the strong activeforces required for MIPS, the interfacial structure and properties are verysimilar for ABP with purely repulsive (WCA-LJ model truncated at its minimum)and when the interaction includes a range of the LJ attractive force.

Intrinsic structure perspective for MIPS interfaces in two dimensional systems of Active Brownian Particles