Role of trapping and crowding as sources of negative differential mobility

Abstract

Increasing the crowding in an environment does not necessarily trigger negative differential mobility of strongly pushed particles. Moreover, the choice of the model, in particular the kind of microscopic jump rates, may be very relevant in determining the mobility. We support these points via simple examples and we therefore address recent claims saying that crowding in an environment is likely to promote negative differential mobility. Trapping of tagged particles enhanced by increasing the force remains the mechanism determining a drift velocity not monotonous in the driving force.

5 pages. v2: new title, restyled figures and more references

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• Non-Gaussian anomalous dynamics in systems of interacting run-and-tumble particles
• Spectral fingerprints of non-equilibrium dynamics: The case of a Brownian gyrator
• Anomalous force-velocity relation of driven inertial tracers in steady laminar flows
• Controlled Fluidization, Mobility and Clogging in Obstacle Arrays Using Periodic Perturbations
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• Negative Differential Mobility in Interacting Particle Systems
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• Time-dependent perpendicular fluctuations in the driven lattice Lorentz gas
• Macroscopic charge segregation in driven polyelectrolyte solutions
• Universal and non-universal signatures in the scaling functions of critical variables