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 Quantum pumping and dissipation in closed systems


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Current can be pumped through a closed system by changing parameters or fields in time. Linear response theory the Kubo formula allows to analyze both the charge transport and the associated dissipation effect. We make a distinction between adiabatic and non-adiabatic regimes, and explain the subtle limit of an infinite system. As an example we discuss the following question: What is the amount of charge which is pushed by a moving scatterer? In the low frequency DC limit we can write dQ=-GdX, where dX is the displacement of the scatterer. Thus the issue is to calculate the generalized conductance $G$.



Autor: Doron Cohen

Fuente: https://archive.org/







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