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Effect of colored noise on an overdamped Josephson junction

机译:有色噪声对过阻尼的约瑟夫逊结的影响

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In this paper my attention is restricted to stochastic differential equation in phase function φ(t), describing an overdamped Josephson junction. I accept the RSJ (resistively shunted junction) modeling, when the contact characterized by resistance R and critical current I_c is under the action of a given direct current I and stochastic current source (I-tilde)(t) (<(I-tilde)(t)> = 0): (h/2eR)(dφ/dt) + I_csinφ = I + (I-tilde)(t). (A)In our case the thermal noise is a Gaussian process and obeys the Johnson-Nyquistr correlation law C(t) = <(I-tilde)(t)(I-tilde)(0)> = h/2πR ∫_(-∞)~∞dω ω coth(hω/2k_BT)cosωt. (B)The effective Fokker-Planck equation is derived and the current-voltage characteristics (CVCs) of the Josephson junction are calculated for weakly colored noise. In the limit lim_(h → 0)C(t) = (2k_BT/R)δ(t) (B')the well-known results for white noise are recovered.
机译:在本文中,我的注意力仅限于相位函数φ(t)中的随机微分方程,它描述了过阻尼的约瑟夫森结。当以电阻R和临界电流I_c为特征的接触点在给定直流I和随机电流源(I-tilde)(t)(<(I-tilde)的作用下,我接受RSJ(电阻分流结)模型)(t)> = 0):(h / 2eR)(dφ/ dt)+I_csinφ= I +(I波浪号)(t)。 (A)在我们的案例中,热噪声是一个高斯过程,服从Johnson-Nyquistr相关定律C(t)= <(I-tilde)(t)(I-tilde)(0)> = h /2πR∫_ (-∞)〜∞dωωcoth(hω/ 2k_BT)cosωt。 (B)推导了有效的Fokker-Planck方程,并针对弱色噪声计算了约瑟夫森结的电流-电压特性(CVC)。在极限lim_(h→0)C(t)=(2k_BT / R)δ(t)(B')中,可以恢复众所周知的白噪声结果。

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