Quantized adiabatic charge pumping and resonant transmission

O. Entin-Wohlman*, Amnon Aharony

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

52 Scopus citations


Adiabatically pumped charge, carried by non interacting electrons through a quantum dot in a turnstile geometry, is studied as a function of the strength of the two modulating potentials (related to the conductances of the two point contacts to the leads) and of the phase shift between them. It is shown that the magnitude and sign of the pumped charge are determined by the relative position and orientation of the closed contour traversed by the system in the parameter plane, and the transmission peaks (or resonances) in that plane. Integer values (in units of the electronic charge e) of the pumped charge (per modulation period) are achieved when a transmission peak falls inside the pumping contour. The integer value is given by the winding number of the pumping contour: double winding in the same direction gives a charge of 2, while winding around two opposite branches of the transmission peaks or winding in opposite directions can give a charge close to zero.

Original languageEnglish
Article number035329
Pages (from-to)353291-353296
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number3
StatePublished - Jul 2002


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