Enhanced current quantization in high frequency electron pumps in a perpendicular magnetic field

Abstract

We present experimental results of high frequency quantized charge pumping through a quantum dot formed by the electric field arising from applied voltages in a GaAs/AlGaAs system in the presence of a perpendicular magnetic field B. Clear changes are observed in the quantized current plateaus as a function of applied magnetic field. We report on the robustness in the length of the quantized plateaus and improvements in the quantization as a result of the applied B field.

4 pages, 4 figures, accepted for publication in Phys. Rev. B