Quantized charge pumping through a quantum dot by surface acoustic waves

Abstract

We present a realization of quantized charge pumping. A lateral quantum dot is defined by metallic split gates in a GaAs/AlGaAs heterostructure. A surface acoustic wave whose wavelength is twice the dot length is used to pump single electrons through the dot at a frequency f=3GHz. The pumped current shows a regular pattern of quantization at values I=nef over a range of gate voltage and wave amplitude settings. The observed values of n, the number of electrons transported per wave cycle, are determined by the number of electronic states in the quantum dot brought into resonance with the fermi level of the electron reservoirs during the pumping cycle.

8 pages

References in corpus (8)

• Scattering approach to parametric pumping
• An Adiabatic Quantum Electron Pump
• Adiabatic charge pumping in almost open dots
• Mesoscopic Fluctuations of Adiabatic Charge Pumping in Quantum Dots
• Pumping at resonant transmission and transferred charge quantization
• Quantum dots in suspended single-wall carbon nanotubes
• Quantized charge transport through a static quantum dot using a surface acoustic wave
• Enhanced quantized current driven by surface acoustic waves

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