  On the basis of the transport features and experimental phenomena observed in
studies of molecular motors, we proposea double-temperature ratchet model of
coupled motors to reveal the dynamical mechanism of cooperative transport of
motors with two heads, where the interactions and asynchrony between two motor
heads are taken into account. We investigate the collective unidirectional
transport of coupled system and find that the direction of motion can be
reversed under certain conditions. Reverse motion can be achieved by modulating
the coupling strength, coupling free length, and asymmetric coefficient of the
periodic potential, which is understood in terms of the effective potential
theory. The dependence of the directed current on various parameters is studied
systematically. Directed transport of coupled Brownian motors can be
manipulated and optimized by adjusting the pulsation period or the phase shift
of the pulsation temperature.
