Исследование резистивного переключения нестационарными сигналами в пленках ZrO-=SUB=-2-=/SUB=-(Y) методом атомно-силовой микроскопии

The features of resistive switching in the yttria stabilized zirconia films on the conductive substrates by triangle pulses with superimposed high-frequency sinusoidal signal has been studied using Conductive Atomic Force Microscopy. The improvement of the ratio of the values of the electric current through the contact of the probe to the surface of the dielectric film in the low resistant state and in the high resistant one as well as of the long-time scale stability of the values of the electric current through the contact in the respective states when applying the sinusoidal sighnal as compared to the switching by the triangle pulses has been observed. The effect was attributed to the resonant activation of the oxygen ion migration via the oxygen vacancies by the alternating external electric field.

Translocation of structured biomolecule through a vibrating nanopore

ABSTRACTWe study the effect of fluctuating environment in protein transport dynamics. In particular, we investigate the translocation of a structured biomolecule (protein) across a temporally modulated nano-pore. We allow the radius of the cylindrical pore to oscillate harmonically with certain frequency and amplitude about an average radius. The protein is imported inside the pore whose dynamics is influences by the fluctuating nature of the pore. We investigate the dynamic and thermodynamical properties of the translocation process by revealing the statistics of translocation time as a function of the pulling inward force acting along the axis of the pore, and the frequency of the time dependent radius of the channel. We also examine the distribution of translocation time in the intermediate frequency regime. We observe that the shaking mechanism of pore leads to accelerate the translocation process as compared to the static channel that has a radius equal to the mean radius of oscillating pore. Moreover, the translocation time shows a global maximum as a function of frequency of the oscillating radius, hence revealing a resonant activation phenomenon in the dynamics of protein translocation.