Dresden 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
DY: Fachverband Dynamik und Statistische Physik
DY 3: Statistical Physics far from Thermal Equilibrium - Part I
DY 3.5: Vortrag
Montag, 31. März 2014, 10:30–10:45, ZEU 160
Emerging Smectic Phases in Simple Active Particle Models — •Pawel Romanczuk1, Sandrine Ngo2, and Hugues Chate3 — 1Physikalisch-Technische Bundesanstalt, Berlin, Germany — 2Dept. of Physics, IPAM and ICSMB, University of Aberdeen, United Kingdom — 3CEA-Saclay, Service de Physique de l’Etat Condensé, CEA-Saclay, Giv-sur-Yvette, France
Recently, several theoretical predictions have been made on so-called active smectics based on hydrodynamic theories derived solemnly from symmetry arguments [1,2]. Here, we show how the mere addition of pairwise repulsive interaction to alignment-only, self-propelled particle models generically gives rise to active smectic phases, which we study numerically in two space dimensions. The versatility of our approach allows us to study polar as well as apolar smectics of various types (A, C, and a new smectic P phase where particles form files so that the orientational order of the particles is parallel to the smectic stripes). We find that smectic order is rather weak: it is quasi-long-range up to some model-dependent size, but quickly breaks down in larger systems due to the spontaneous nucleation of dislocations and the presence of a long-wavelength undulation instability. Furthermore, our study also reveals a number of unexpected collective dynamical properties such as spontaneous global rotation of both orientational and smectic order.
[1] Adhyapak, T. et al, Phys Rev Lett 110, 11, 118102 (2013)
[2] Chen, L. and Toner, J., Phys Rev Lett 111, 8, 088701 (2013)