| We explore active rod-like colloidal particles by computer simulation and theory. First of all, the Brownian motion of self-propelled particles is described. Then Brownian dynamics simulations are used to explore the nonequilibrium dynamics of concentrated self-propelled rods which are interacting via a Yukawa segment model. In a linear channel, transient hedgehog-clustering at the system boundaries is found [1]. In the two-dimensional bulk, anomalous turbulence emerges [2] in agreement with recent experimental data on bacterial motion [3]. We then d discuss possibilities to trap self-propelled particles effieciently [4]. Finally we study the freezing transition for very dense self-propelled particles and find differences to equilibrium freezing [5,6]. [1] H. H. Wensink, H. Lowen, Phys. Rev. E 78, 031409 (2008). [2] H. H. Wensink, H. Lowen, Emergent states in dense systems of active rods: from swarming to turbulence, J. Phys.: Condensed Matter (in press), see also http://arxiv.org/abs/1204.0381 [3] H. H. Wensink, J. Dunkel, S. Heidenreich, K. Drescher, R. E. Goldstein, H. Lowen, J. M. Yeomans, PNAS 109, 14308-14313 (2012). [4] A. Kaiser, H. H. Wensink, H. Lowen, Physical Review Letters 108, 268307 (2012). [5] J. Bialk\'e, T. Speck, H. Lowen, Physical Review Letters 108, 168301 (2012). [6] A. M. Menzel, H. Lowen, Traveling and resting crystals in active systems, submitted |
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