FLICKER NOISE IN THIN LIPID FILMS

Nonlinear charge conduction in an organized assembly of Lipid molecule s has long been established. However, the exact mechanism of charge tr ansport across them is still not very clear. Since resistance involves the second moment of the current distribution, while noise involves t he fourth moment, the noise measurement should be more informative abo ut the underlying mechanism of charge transport. Using this perspectiv e, we have measured noise in thin solid films of lipid molecules over a wide range of voltages that covers linear as well as nonlinear regim es. The power spectra obtained in this system show an increase in the relative noise with bias. This can be explained by considering the sys tem to be a random resistor network consisting of nonlinear current el ements.