Alignment Destabilizes Crystal Orders in Active Systems

Abstract

We combine numerical and analytical methods to study two dimensional active crystals formed by permanently linked swimmers and with two distinct alignment interactions. The system admits a stationary phase with quasi long range translational order, as well as a moving phase with quasi-long range velocity order. The translational order in the moving phase is significantly influenced by alignment interaction. For Vicsek-like alignment, the translational order is short-ranged, whereas the bond-orientational order is quasi-long ranged, implying a moving hexatic phase. For elasticity-based alignment, the translational order is quasi-long ranged parallel to the motion and short-ranged in perpendicular direction, whereas the bond orientational order is long-ranged. We also generalize these results to higher dimensions.

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Cited by in corpus (5)

• Extreme Spontaneous Deformations of Active Crystals
• Enhancing (quasi-)long-range order in a two-dimensional driven crystal
• Long-range translational order and hyperuniformity in two-dimensional chiral active crystal
• Hyperuniform interfaces in non-equilibrium phase coexistence
• Collective excitations in active solids featuring alignment interactions