Dynamics of Quantum-Dot Turnstile in Adiabatic Approximation

抄録

We derive an expression for the current in a quantum-dot turnstile device in the lowest order of tunnel processes. The electrochemical potential μ in the quantum dot is determined from the current continuity across both barriers. By the use of the adiabatic approximation, the quantized current plateaus in the I-V curve are obtained for the device with symmetric barriers oscillating with a phase difference π . We find that both the height and the position of the steps change as the gate voltage is varied. We also show how the current and the electron number in a quantum dot vary as a function of time.