Effect of magnetic fields on high accuracy single-electron pumps
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Quantum dot-based single electron pumps are a convincing candidate for use as a quantum metrological current standard.
These devices generate an electrical current 'one electron at a time' under control of a clock signal. Magnetic fields enhance the accuracy of these pumps.
To understand the origin of this effect we performed detailed measurements of electron pumps in magnetic field and numerical simulations of the quantum tunnelling processes. Magnetic confinement effects drive an enhancement in pump accuracy, but also protect the quantum dot from quantum spillage, a quantum mechanical process that can cause electrons to be lost when operating at high frequencies.
This poster was presented at the 19th conference on the Electronic Properties of Two-Dimensional System (EP2DS), Tallahassee, Florida.