Tuning Nonequilibrium Phase Transitions with Inertia

Omar, Ahmad K.; Klymko, Katherine; GrandPre, Trevor; Geissler, Phillip L.; Brady, John F.

doi:10.48550/arxiv.2108.10278

Cited by 7 publications

(10 citation statements)

References 63 publications

(75 reference statements)

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“…However, MIPS is disfavored in a broad range of cases that go beyond this simple setup. Indeed, anisotropic rod-like particle shapes [83][84][85], aligning interactions [86][87][88], circling torques [89,90], hydrodynamic interactions [84,91], polydispersity [70,92] and translational inertia [49][50][51][52] typically act against MIPS. Contrarily, we have shown here that rotational inertia favors MIPS by contributing to increasing the effective persistence time of the particle dynamics.…”

Section: Discussionmentioning

confidence: 99%

“…However, the non-equilibrium phase coexistence typical of active matter, known as motility induced phase separation [43][44][45][46][47][48], is suppressed by translational inertia [49][50][51][52]. Similarly, inertial effects reduce the accumulation near boundaries or obstacles typical of active particles [53][54][55] and hinder the crystallization [56].…”

Section: Introductionmentioning

confidence: 99%

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Role of rotational inertia for collective phenomena in active matter

Caprini¹,

Gupta²,

Löwen³

2022

Preprint

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We investigate the effect of rotational inertia on the collective phenomena of underdamped active systems and show that the increase of the moment of inertia of each particle favors non-equilibrium phase coexistence, known as motility induced phase separation, and counteracts its suppression due to translational inertia. Our conclusion is supported by a non-equilibrium phase diagram (in the plane spanned by rotational inertial time and translational inertial time) whose transition line is understood theoretically through scaling arguments. In addition, rotational inertia increases the correlation length of the spatial velocity correlations in the dense cluster. The fact that rotational inertia enhances collective phenomena, such as motility induced phase separation and spatial velocity correlations, is strongly linked to the increase of rotational persistence. Moreover, large moments of inertia induce non-monotonic temporal (cross) correlations between translational and rotational degrees of freedom truly absent in non-equilibrium systems.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Role of rotational inertia for collective phenomena in active matter

Caprini¹,

Gupta²,

Löwen³

2022

Preprint

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“…The first question concerns the role of particles mass, and in particular the interplay between inertial and active diffusion timescales, which can be varied independently [35,36]. It has been pointed out in [37] that in three-dimensional active systems, inertia should attenuate the destabilizing effect of activity on the ordered phase. The presence of large inertia has also been shown to strongly affect the kinetic energy of the particles into the highly dense phase of MIPS [38], and to highly inhibit phase segregation [39].…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic effects on the liquid-hexatic transition of active colloids

Negro

Digregorio

et al. 2022

Eur. Phys. J. E

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We study numerically the role of hydrodynamics in the liquid-hexatic transition of active colloids at intermediate activity, where motility induced phase separation (MIPS) does not occur. We show that in the case of active Brownian particles (ABP), the critical density of the transition decreases upon increasing the particle’s mass, enhancing ordering, while self-propulsion has the opposite effect in the activity regime considered. Active hydrodynamic particles (AHP), instead, undergo the liquid-hexatic transition at higher values of packing fraction $$\phi $$ ϕ than the corresponding ABP, suggesting that hydrodynamics have the net effect of disordering the system. At increasing densities, close to the hexatic-liquid transition, we found in the case of AHP the appearance of self-sustained organized motion with clusters of particles moving coherently.

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“…However, recent experiments [21][22][23] have found that the inertia of active particles is important in a variety of contexts. Moreover, theoretical and experimental studies have found a number of remarkable effects associated with inertial active matter [24], ranging from self-sustained temperature gradients [25] through restored equilibrium crystallization [26] to damping-dependent phase boundaries [27].…”

Section: Introductionmentioning

confidence: 99%