Volume 81, Number 5, March 2008
|Number of page(s)||6|
|Published online||19 February 2008|
Brownian dynamics simulations of flicker noise in nanochannels currents
M. Smoluchowski Institute of Physics, Jagiellonian University - Reymonta 4, PL-30-059 Kraków, Poland
2 Institut für Physik, Universität Augsburg - D-86135 Augsburg, Germany
Accepted: 17 January 2008
We simulated the single-file motion of ions through a model channel with the gate which opens and closes under influence of white noise and of interactions with ions present inside the channel. There is a range of the model parameters, in which the power spectrum of the ion net current through the channel has the characteristics of the flicker noise. The flicker noise is accompanied by the long-tail dwell-time distributions. The stochastic analysis of the calculated currents reveals their self-similarity. The open-state currents scale with the scaling exponent β=-1.0±0.15. To our best knowledge, our results are the first derivation of noise directly from Langevin equations with simple electrostatic interactions and white noise.
PACS: 05.40.Ca – Noise / 02.70.-c – Computational techniques; simulations / 47.61.-k – Micro and nano-scale flow phenomena
© EPLA, 2008
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