Directed transport of coupled systems in symmetric periodic potentials

• 来源期刊: 中国物理（英文版）
• 关键词: Frenkel-Kontorova model molecular motor directed transport broken symmetry
• 年，卷（期）: 2003,（8）
• 页码范围: 846-850
• 页数: 5页
• 语种: 英文

摘要

In this paper, we discuss the damped unidirectional motions of a coupled lattice in a periodic potential. Each particle in the lattice is subject to a time-periodic ac force. Our studies reveal that a directed transport process can be observed when the ac forces acting on the coupled lattice have a phase shift (mismatch). This directed motion is a collaboration of the coupling, the substrate potential, and the periodic force, which are all.symmetric. The absence of any one of these three factors will not give rise to a directed current. We discuss the complex relations between the directed current and parameters in the system. Results in this paper can be accomplished in experiments. Moreover,our results can be generalized to the studies of directed transport processes in more complicated spatially extended systems.