Stabilization of single-electron pumps by high magnetic fields

Details Stabilization of single-electron pumps by high magnetic fields Stabilization of single-electron pumps by high magnetic fields

2011-07-22

arxiv.org/abs/1107.4560v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

We study the effect of perpendicular magnetic fields on a single-electron system with a strongly time-dependent electrostatic potential. Continuous improvements to the current quantization in these electron pumps are revealed by high-resolution measurements. Simulations show that the sensitivity of tunnel rates to the barrier potential is enhanced, stabilizing particular charge states. Nonadiabatic excitations are also suppressed due to a reduced sensitivity of the Fock-Darwin states to electrostatic potential. The combination of these effects leads to significantly more accurate current quantization.

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