Directed Current Induced by an Symmetrically ac Force Coexisting with a Time-Delayed Feedback

• 作者: 宋晖 易述婷 欧志娥 熊建文 艾保全
• 来源期刊: 理论物理通讯：英文版
• 学科: 数学
• 关键词: 延迟时间 延迟反馈 非对称 交流 部队 共存 电流 导演
• 年，卷（期）: 2012,（2）
• 页码范围: 223-226
• 页数: 4页
• 分类号: O223|O322
• 语种: 英文

摘要

We study the transport of overdamped Brownian particles in a symmetricaJly periodic potential in the presence of an asymmetrically ac driving force and a time-delayed feedback. It is found that for low frequencies, the average velocity can be negative by changing the driving amplitude, for high frequencies, there exists an optimized driving amplitude at which the average velocity takes its maximum value. Additionally, there is a threshold value of driving amplitude below which no directed transport can be obtained for high frequencies. For the large value of the delay time, the average velocity is independent of the delay time.