title: Formation, compression and surface melting of colloidal clusters by active particles.
abstract: We demonstrate with experiments and numerical simulations that the structure and dynamics of a suspension of passive particles is strongly altered by adding a very small (<1%) number of active particles. With increasing passive particle density, we observe first the formation of dynamic clusters comprised of passive particles being surrounded by active particles, then the merging and compression of these clusters, and eventually the local melting of crystalline regions by enclosed active particles.
authors.affiliation: 2. Physikalisches Institut, Universität Stuttgart, D-70569 Stuttgart, Germany. c.bechinger@physik.uni-stuttgart.de.
authors.forename: Felix
authors.initials: F
authors.lastname: Kümmel
authors.forename: Parmida
authors.initials: P
authors.lastname: Shabestari
authors.forename: Celia
authors.initials: C
authors.lastname: Lozano
authors.forename: Giovanni
authors.initials: G
authors.lastname: Volpe
authors.forename: Clemens
authors.initials: C
authors.lastname: Bechinger