Abstract
In a quantum charge pump, the periodic variation of two parameters that affect the phase of the electronic wave function causes the flow of a direct current. The operating mechanism of a quantum pump is based on quantum interference, the phases of interfering amplitudes being modulated by the external parameters. In a ballistic quantum dot, there is a minimum time before which quantum interference cannot occur: the Ehrenfest time . Here we calculate the current pumped through a ballistic quantum dot if is comparable to the mean dwell time . Remarkably, we find that the pumped current has a component that is not suppressed if .
1 More- Received 17 July 2006
DOI:https://doi.org/10.1103/PhysRevB.74.205327
©2006 American Physical Society