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Phys Rev Lett. 2009 Dec 11;103(24):248104. Epub 2009 Dec 9.

Nonequilibrium 1/f noise in rectifying nanopores.

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Department of Physics and Astronomy, University of California, Irvine, Irvine, California 92697, USA.


We report a single rectifying conically shaped nanopore system with ion current fluctuations whose 1/f noise characteristics observed at low frequencies are voltage dependent. Switching the voltage polarity allows one to switch between a system that produces equilibrium and nonequilibrium 1/f ion current fluctuations. The nonequilibrium fluctuations in the high-conductance state of the device are characterized by exponential dependence of the normalized power spectrum on voltage. The asymmetric 1/f noise is found characteristic for rectifying polymer nanopores and absent in pores with Ohmic current-voltage curves.

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