Quantized charge pumping by surface acoustic waves in ballistic quasi-1D channels

Abstract

Adiabatic pumping of electrons induced by surface acoustic waves (SAWs) in a ballistic quasi-1D quantum channel is considered using an exactly solvable tight-binding model for non-interacting electrons. The single-electron degrees of freedom, responsible for acoustoelectric current quantization, are related to the transmission resonances. We study the influence of experimentally controllable parameters (SAW power, gate voltage, source-drain bias, amplitude and phase of a secondary SAW beam) on the plateau-like structure of the acoustoelectric current. The results are consistent with existing experimental observations.

11 pages, 8 figures

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• Comparison of quantization of charge transport in periodic and open pumps
• Single-electron transport driven by surface acoustic waves: moving quantum dots versus short barriers
• Stationary drag photocurrent caused by strong running wave in quantum wire: quantization of current
• Quantum pumping of electrons by a moving modulated potential