Adiabatic charge pumping through a dot at the junction of N quantum wires

Details Adiabatic charge pumping through a dot at the junction of N quantum wires Adiabatic charge pumping through a dot at the junction of N quantum wires

2006-08-11

arxiv.org/abs/cond-mat/0608267v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 6 figures, version to be published in PRB

Scientific paper

10.1103/PhysRevB.75.153407

We study adiabatic charge pumping through a quantum dot placed at the junction of $N$ quantum wires. We explicitly map out the pattern of pumped charge as a function of the time-varying tunneling parameters coupling the wires to the dot and the phase between any two time varying parameters controlling the shape of the dot. We find that with $N-2$ time-independent well-coupled leads, the maximum pumped charge in the remaining two leads is strongly suppressed with increasing $N$, leading to the possibility of tuning of the pumped charge, by modulating the coupling of the $N-2$ leads.

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