Active dumbbells: Dynamics and morphology in the coexisting region

Petrelli, Isabella; Digregorio, Pasquale; Cugliandolo, Leticia F.; Gonnella, Giuseppe; Suma, Antonio

doi:10.1140/epje/i2018-11739-y

Cited by 44 publications

(45 citation statements)

References 128 publications

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“…Specifically for such particles, ref. [46] has recently observed (but hardly analyzed) the occurrence of different kinetic energies in coexisting phases, suggesting that the present findings survive for particles of nonspherical shape.…”

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confidence: 55%

Motility-Induced Temperature Difference in Coexisting Phases

2019

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Unlike in thermodynamic equilibrium where coexisting phases always have the same temperature, here we show that systems comprising "active" self-propelled particles can self-organize into two coexisting phases at different kinetic temperatures, which are separated from each other by a sharp and persistent temperature gradient. Contrasting previous studies which have focused on overdamped descriptions of active particles, we show that a "hot-cold-coexistence" occurs if and only if accounting for inertia, which is significant in a broad range of systems such as activated dusty plasmas, microflyers, whirling fruits or beetles at interfaces. Our results exemplify a route to use active particles to create a self-sustained temperature gradient across coexisting phases, a phenomenon, which is fundamentally beyond equilibrium physics. arXiv:1902.06116v2 [cond-mat.soft]

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confidence: 55%

Motility-Induced Temperature Difference in Coexisting Phases

2019

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“…Certain biological systems such as run-and-tumble bacteria or crawling cells, as well as nonbiological systems such as self-driven colloids or artificial swimmers, commonly referred as active matter, can be described in terms of effective models able to capture their salient features [1][2][3]. Active particles display a very rich phenomenology, such as their accumulation at the boundaries [4][5][6][7] and near rigid obstacles [8][9][10][11][12][13] or a kind of nonequilibrium phase-coexistence, known as motility induced phase separation (MIPS) [14][15][16][17][18] occurring even in the absence of attractive [19][20][21][22][23][24][25][26][27][28] or depletion interactions [29]. Selfpropelled particles are far-from-equilibrium systems, showing several dynamical anomalies which have not a Brownian counterpart [30,31].…”

Section: Introductionmentioning

confidence: 99%

Time-dependent properties of interacting active matter: Dynamical behavior of one-dimensional systems of self-propelled particles

Caprini

Marconi

2020

Phys. Rev. Research

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We study an interacting high-density one-dimensional system of self-propelled particles described by the active Ornstein-Uhlenbeck particle model where, even in the absence of alignment interactions, velocity and energy domains spontaneously form in analogy with those already observed in two dimensions. Such domains are regions where the individual velocities are spatially correlated as a result of the interplay between self-propulsion and interactions. Their typical size is controlled by a characteristic correlation length. In this work, we focus on a lesser-known aspect of the model, namely, its dynamical behavior. To this purpose, we investigate theoretically and numerically the time-dependent velocity autocorrelation and spatiotemporal velocity correlation functions. The study of these correlations provides a measure of the average lifetime and, thus, the stability in time of the velocity domains.

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“…While in the absence of friction [13] the low-density spinodal line diverges at a finite volume fraction φ m > 0, in the presence of friction it diverges at φ m → 0. In this respect, friction makes the motility-induced phase diagram of ABPs closer to that observed in most active particle systems, including dumbbells [14,15] and schematic models such as run-and-tumble particles [13], active OrnsteinUhlenbeck [16], and Monte Carlo models [17], and also closer to gas-liquid transition phase diagram in passive systems. Since the frictional interaction between colloidal scale particles can be experimentally tuned [4], our result indicates that it is possible to experimentally modulate the motility-induced phase diagram by optimising the particle roughness.…”

Section: Introductionmentioning

confidence: 57%

Frictional active Brownian particles

et al. 2020

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Frictional forces affect the rheology of hard-sphere colloids, at high shear rate. Here we demonstrate, via numerical simulations, that they also affect the dynamics of active Brownian particles and their motility-induced phase separation. Frictional forces increase the angular diffusivity of the particles, in the dilute phase, and prevent colliding particles from resolving their collision by sliding one past to the other. This leads to qualitatively changes of motility-induced phase diagram in the volume-fraction motility plane. While frictionless systems become unstable towards phase separation as the motility increases only if their volume fraction overcomes a threshold, frictional systems become unstable regardless of their volume fraction. These results suggest the possibility of controlling the motility-induced phase diagram by tuning the roughness of the particles.

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Active dumbbells: Dynamics and morphology in the coexisting region

Cited by 44 publications

References 128 publications

Motility-Induced Temperature Difference in Coexisting Phases

Motility-Induced Temperature Difference in Coexisting Phases

Time-dependent properties of interacting active matter: Dynamical behavior of one-dimensional systems of self-propelled particles

Frictional active Brownian particles

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