Isotropic-nematic transition of self-propelled rods in three dimensions

Bott, M. C.; Winterhalter, Felix; Maréchal, Matthieu; Sharma, Abhinav; Brader, Joseph M.; Wittmann, René

doi:10.1103/physreve.98.012601

Cited by 25 publications

(20 citation statements)

References 57 publications

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“…This pair potential is a popular model for liquid crystals and shows a passive isotropic-nematic phase transition as the density is increased [26]. In addition, particles are propelled along their major axis with constant speed v 0 [27]. In agreement with similar studies [23,24], we find the suppression of MIPS and the emergence of polar order for elongated particles.…”

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confidence: 90%

From scalar to polar active matter: Connecting simulations with mean-field theory

2020

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We study numerically the phase behavior of self-propelled elliptical particles interacting through the "hard" repulsive Gay-Berne potential at infinite Péclet number. Changing a single parameter, the aspect ratio, allows to continuously go from discoid active Brownian particles to elongated polar rods. Discoids show phase separation, which changes to a cluster state of polar domains, which then form polar bands as the aspect ratio is increased. From the simulations, we identify and extract the two effective parameters entering the mean-field description: the force imbalance coefficient and the effective coupling to the local polarization. These two coefficients are sufficient to obtain a complete and consistent picture, unifying the paradigms of scalar and polar active matter. arXiv:1910.06547v1 [cond-mat.stat-mech]

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supporting

confidence: 90%

From scalar to polar active matter: Connecting simulations with mean-field theory

2020

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“…These possibly include novel devices for information storage, templates for functional microstructured materials and channels for micro-or nanofluidics. Regarding the recently flourishing research realm of living or self-motile particles, a challenging extension of the present work could consist of systematically studying the influence of activity on the predicted equilibrium state diagram 62 . Finally, a fascinating connection with biology emerges from drawing the analogies between colloidal liquid crystals and growing colonies of rod-shaped bacteria [63][64][65][66] .…”

Section: Discussionmentioning

confidence: 99%

Particle-resolved topological defects of smectic colloidal liquid crystals in extreme confinement

et al. 2021

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Confined samples of liquid crystals are characterized by a variety of topological defects and can be exposed to external constraints such as extreme confinements with nontrivial topology. Here we explore the intrinsic structure of smectic colloidal layers dictated by the interplay between entropy and an imposed external topology. Considering an annular confinement as a basic example, a plethora of competing states is found with nontrivial defect structures ranging from laminar states to multiple smectic domains and arrays of edge dislocations, which we refer to as Shubnikov states in formal analogy to the characteristic of type-II superconductors. Our particle-resolved results, gained by a combination of real-space microscopy of thermal colloidal rods and fundamental-measure-based density functional theory of hard anisotropic bodies, agree on a quantitative level.

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“…In the famous Vicsek model coarse-grained aligning interactions are able to reproduce dynamical states such as flocking and swarming. [29][30][31] Langevin dynamics simulations of active rods 4,32,33 or active filaments 34,35 suggest that many properties might already emerge from shortranged steric interactions. However, also implicit hydrodynamic pair interactions are included in such simulations to provide more realistic models with novel dynamic states.…”

Section: Introductionmentioning

confidence: 99%