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非高斯噪声对惯性棘轮中粒子负迁移率的影响*
Effect of non-Gaussian noise on negative mobliity*
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摘要: 利用随机模拟方法研究了惯性棘轮中非高斯噪声对负迁移率的影响.分别模拟了绝对负迁移率(ANM),非线性迁移率(NNM)和负微分迁移率(NDM)等三种反常输运现象.计算结果表明:1)在不同的参数空间里,非高斯噪声参数q能够增强或者削弱ANM,诱导NNM和NDM;2)当q较大时,反常输运现象转化为正常输运;3)随着q逐渐增大,平均速度-关联时间特性曲线朝着关联时间较小的方向移动并且其峰值逐渐减小.Abstract: Effects of non-Gaussian noise on negative mobility in an inertial ratchet were investigated by means of stochastic simulation method. The absolute negative mobility (ANM), negative nonlinear mobility (NDM), and negative differential mobility (NNM) were simulated, separately. Results indicate that:(i) non-Gaussian noise can either enhance or diminish the phenomena of ANM, and non-Gaussian noise also can induce NDM and NNM in regions of parameter space. (ii) The average velocity-correlation time characteristics shift towards small value of correlation time. (iii) The absolute value of negative-valued minima decreases as the non-Gaussian noise parameter q increases.
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