Gian Michele Graf and Gregorio Ortelli
Comparison of quantization of charge transport in periodic and open 
pumps
(15K, LaTeX)

ABSTRACT.  We compare the charges transported in two systems, a spatially periodic 
and an open quantum pump, both depending periodically and adiabatically 
on time. The charge transported in a cycle was computed by Thouless, respectively by Buttiker et al. in the two cases. We show that the 
results agree in the limit where the two physical situations become the 
same, i.e., that of a large open pump.