【摘 要】
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The ratchet motion of a Brownian particle in a symmetric periodic potential under a rocking force thatbreaks the temporal symmetry is studied. As long as the re
【机 构】
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Department of Physics
【基金项目】
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国家自然科学基金;国家重点基础研究发展计划(973计划);教育部大学校科研和教改项目;高等学校全国优秀博士学位论文作者专项基金;高等学校优秀青年教师教学科研奖励计划;教育部霍英东教育基金
论文部分内容阅读
The ratchet motion of a Brownian particle in a symmetric periodic potential under a rocking force thatbreaks the temporal symmetry is studied. As long as the relaxation time in the thermal background is much shorter thanthe forcing period, the unidirectional transport can be analytically treated. By solving the Fokker-Planck equations, weget an analytical expression of the current. This result indicates that with an appropriate match between the potentialfield, the asymmetric ac force and the thermal noise, a net current can be achieved. The current versus thermal noiseexhibits a stochastic-resonance-like behavior.
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