On the quantization accuracy of the acoustoelectric current

TL;DR

This paper derives analytical formulas to evaluate the quantization accuracy of acoustoelectric current, showing current plateau flatness limits and proposing methods to significantly improve accuracy for quantum standards.

Contribution

It introduces analytical expressions for quantization accuracy and suggests channel length and wavelength adjustments to enhance precision.

Findings

Current plateau flatness reaches about 100ppm limit.

Increasing channel length improves accuracy.

Adjusting acoustic wavelength can reduce errors to 0.01ppm.

Abstract

By deriving analytical formulae for the quantization accuracy of the acoustoelectric current, we reveal that: 1) the flatness of the current plateau for the typical present devices has reached the theoretical limit of about 100ppm over a 1/1000 change of the gate voltage; 2) increasing the transport channel length, and counterintuitively, increasing the acoustic wavelength as well, would improve the quantization accuracy, and very promisingly up to 0.01ppm as required for a quantum current standard.