Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2002-05-11
Physica A 318 (40-47), 2003
Physics
Condensed Matter
Soft Condensed Matter
To be published as Proceedings of StatPhys - Kolkata IV in Physics A
Scientific paper
10.1016/S0378-4371(02)01400-0
A ratchet model for coupled Brownian motors, inspired by the motion of individual two-headed molecular motors on cytoskeletal filaments, is proposed. Such motors are modeled as two elastically coupled Brownian particles, each of which moves in a flashing ratchet potential. The ratchet potentials felt by the individual particles are anti-correlated, modeling the successive binding and unbinding of the two motor heads to the filament. We obtain, via Langevin simulations, steady-state currents as functions of noise strength, the equilibrium separation of the particles and the rate of switching between potential states. We observe an enhanced current due to coupling, noise induced stability and phase-locked behaviour in the deterministic regime. A qualitative understanding of these features is provided.
Dan Debasis
Jayannavar Arun M.
Menon Gautam I.
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