1 Publisher Correction to: Applied Physics A (2018) 124:619 https://doi.org/10.1007/s00339-018-1958-x

Dear readers,


Unfortunately, the original version of this article did not correctly reflect the change of authorship.

The corresponding author of this article is Prof. Zhiyong Wang, E-Mail: zywang_bjut@126.com.

Please excuse this mistake.

The original article was corrected.