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We study the aggregation transition of a finite theta-polymer system independence on the bending stiffness $\kappa$ with the help of parallelmulticanonical simulations. In order to distinguish amorphous aggregates frompolymer bundles we introduce an order parameter, measuring the correlation ofthe end-to-end vectors. With the help of this order parameter, we constructgeneric $T$-$\kappa$ phase diagrams for systems with $2$ and $8$ polymers anddiscuss the occurring phases from amorphous aggregates to bundle structures.For an intermediate stiffness range we find multiple aggregated phases whichchange with increasing number of polymers and discuss their nature with thehelp of microcanonical analyses. We show that the stiffness of semiflexibletheta polymers is the distinguishing parameter for the emergent structuralmotifs.

From amorphous aggregates to polymer bundles: The role of stiffness on structural phases in polymer aggregation