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在非绝热记忆棘轮中信号与噪声耦合控制流

CURRENT CONTROLLED BY COUPLING BETWEEN SIGNAL AND NOISE IN THE DIABATIC MEMORY RATCHET
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摘要 建立了一个研究布朗马达输运的非绝热和记忆棘轮模型 ,即用一个外部非偏压周期力去驱动一个处于记忆阻尼环境和内部简谐噪声作用下的布朗粒子 ,在非对称周期势中产生定向流 .结果表明 :随着内噪声频率的变化 ,粒子流发生反转且负向极大流所对应的外部信号频率也随之不同 ,则粒子流的方向和大小是由外部信号和内部噪声相互耦合控制的 。 A model for the Brownian motor moving in a diabatic and memory ratchet is proposed. The particle in such a ratchet driven by an internal harmonic noise and an external periodic signal exists a directional current. The results show that the signal frequency where reversal and negative maximum of the current occur varies when the frequency of noise changes. Coupling between internal noise and external signal controls the direction and the magnitude of the current. This is a phenomenon of dynamic resonance.
出处 《北京师范大学学报(自然科学版)》 CAS CSCD 北大核心 2004年第2期196-200,共5页 Journal of Beijing Normal University(Natural Science)
基金 国家自然科学基金资助项目 ( 10 0 75 0 0 7 10 2 35 0 2 0 ) 教育部跨世纪优秀人才基础资助项目
关键词 记忆棘轮 热简谐噪声 速度流 memory ratchet thermal harmonic noise velocity current
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参考文献10

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