Dresden 2009 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 2: Statistical physics in biological systems I (joint session DY/BP)

DY 2.1: Vortrag

Montag, 23. März 2009, 11:00–11:15, ZEU 255

Segregation and long-range order in self-propelled particles with nematic interactions — •Markus Bär¹, Hugues Chate², Andreas Deutsch³, Francesco Ginelli^{2, 4}, and Fernando Peruani⁴ — ¹Physikalisch-Technische Bundesanstalt, Berlin — ²CEA Saclay, France — ³ZIH, TU Dresden — ⁴ICS Paris

Motivated by experiments on collective dynamics of gliding bacteria, we study collective phenomena in a two-dimensional stochastic system of self-propelled particles (SPP) interacting locally through an apolar, nematic alignment mechanism. Extensive simulations show that there are four qualitatively different regions of spatial organisation. At high noise intensity, disordered spatially homogeneous distributions are found, while at low noise intensity long-range nematic order is found. For intermediate noises and large enough system size, the system segregates into macroscopic areas with either high or very low particle density. The high density areas take the form of bands that can take on stable straight shapes or can be dynamically changing depending on the size of the system, band width and noise intensity.