Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2011-03-15
Phys. Rev. E 83, 061401 (2011)
Physics
Condensed Matter
Soft Condensed Matter
Scientific paper
10.1103/PhysRevE.83.061401
We consider the unidirectional particle transport in a suspension of colloidal particles which interact with each other via a pair potential having a hard-core repulsion plus an attractive tail. The colloids are confined within a long narrow channel and are driven along by a DC or an AC external potential. In addition, the walls of the channel interact with the particles via a ratchet-like periodic potential. We use dynamical density functional theory to compute the average particle current. In the case of DC drive, we show that as the attraction strength between the colloids is increased beyond a critical value, the stationary density distribution of the particles loses its stability leading to depinning and a time dependent density profile. Attraction induced symmetry breaking gives rise to the coexistence of stable stationary density profiles with different spatial periods and time-periodic density profiles, each characterized by different values for the particle current.
Archer Andrew J.
Marchesoni Fabio
Pototsky Andrey
Savel'ev Sergey E.
Thiele Uwe
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