Guo, Qiushi https://orcid.org/0000-0002-6217-102X
Yu, Renwen https://orcid.org/0000-0002-9701-5270
Li, Cheng
Yuan, Shaofan
Deng, Bingchen
García de Abajo, F. Javier https://orcid.org/0000-0002-4970-4565
Xia, Fengnian https://orcid.org/0000-0001-5176-368X
Article History
Received: 8 December 2017
Accepted: 30 July 2018
First Online: 27 August 2018
Change Date: 10 September 2018
Change Type: Correction
Change Details: In the version of this Article originally published, the units of the right-hand y axis of Fig. 2a were incorrectly labelled as mS; they should have been µS. Also, the x-axis tick marks of Fig. 3b should have been aligned with Fig. 3a,c. These have now been corrected.
Competing interests
: The authors declare no competing interests.