论文标题
闪烁噪声的量子理论：1/F定律作为电压功率谱的下限
Quantum theory of flicker noise: the 1/f law as a lower bound on the voltage power spectrum
论文作者
论文摘要
在所有导电介质中观察到的1/F电压噪声问题的方法是基于傅立叶变换信号的不确定性关系而开发的。结果表明，在不同时间可观察到的量子不确定性引起的量子不确定性使电压波动的功率谱放在下限上。使用Schwinger-keldysh方法，在非极化自由载体的情况下，明确计算了该结合，并且发现其具有1/F的低频渐近性。还证明了与声子的电荷载体相互作用的解释会导致频率指数从统一转移。对INGAAS量子孔和高温超导体中1/F噪声的实验数据进行了比较，这表明观察到的噪声水平只有几倍与结合的几倍。
An approach to the problem of 1/f voltage noise observed in all conducting media is developed based on an uncertainty relation for the Fourier-transformed signal. It is shown that the quantum indeterminacy caused by non-commutativity of observables at different times sets a lower bound on the power spectrum of voltage fluctuations. Using the Schwinger-Keldysh method, this bound is calculated explicitly in the case of unpolarized free-like charge carriers, and is found to have a 1/f low-frequency asymptotic. It is demonstrated also that account of the charge carrier interaction with phonons results in a shift of the frequency exponent from unity. A comparison with the experimental data on 1/f noise in InGaAs quantum wells and high-temperature superconductors is made which shows that the observed noise levels are only a few times as high as the bound established.
