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.
Cite
@article{arxiv.0807.2586,
title = {On the quantization accuracy of the acoustoelectric current},
author = {Xiang-Bai Chen and Xiang-Song Chen and Jie Gao},
journal= {arXiv preprint arXiv:0807.2586},
year = {2011}
}