DYNAMICS OF QUANTUM-DOT TURNSTILE IN ADIABATIC APPROXIMATION

We derive an expression for the current in a quantum-dot turnstile dev ice in the lowest order of tunnel processes. The electrochemical poten tial mu in the quantum dot is determined from the current continuity a cross both barriers. By the use of the adiabatic approximation, the qu antized current plateaus in the I-V curve are obtained for the device with symmetric barriers oscillating with a phase difference pi. We fin d that both the height and the position of the steps change as the gat e voltage is varied. We also show how the current and the electron num ber in a quantum dot vary as a function of time.