A scattering matrix approach to quantum pumping: Beyond the small-ac-driving-amplitude limit
arXiv:0911.1163
Abstract
In the adiabatic and weak-modulation quantum pump, net electron flow is driven from one reservoir to the other by absorbing or emitting an energy quantum $\hbar Ï$ from or to the reservoirs. In our approach, high-order dependence of the scattering matrix on the time is considered. Non-sinusoidal behavior of strong pumping is revealed. The relation between the pumped current and the ac driving amplitude varies from power of 2, 1 to 1/2 when stronger modulation is exerted. Open experimental observation can be interpreted by multi-energy-quantum-related processes.
12 pages, 3 figures