PRACTICAL ANALYSIS OF SINGLE-ELECTRON PUMP WITH HARMONIC DRIVE

We study a two-gate single electron pump device with harmonic AC gate voltages. We have performed numerical and analytical calculations of q uantum correction to a DC current due to the cotunneling phenomena. Th is correction determines the accuracy of the device in a wide range of parameters (temperature, frequency and amplitude of the gate voltage modulation). We found the crossover from adiabatic transport at lower frequencies f much less than f(cr) to non-adiabatic transport at highe r frequencies f much greater than f(cr). The crossover frequency f(cr) = {k(B)T/(e(2)/C)}(2)/(A R(T)C) is argued to be the optimal frequency of the pump operation.