Summerfield, Alex
Davies, Andrew
Cheng, Tin S.
Korolkov, Vladimir V.
Cho, YongJin
Mellor, Christopher J.
Foxon, C. Thomas
Khlobystov, Andrei N.
Watanabe, Kenji
Taniguchi, Takashi
Eaves, Laurence
Novikov, Sergei V.
Beton, Peter H.
Article History
Received: 9 December 2015
Accepted: 15 February 2016
First Online: 1 March 2016
Change Date: 2 June 2016
Change Type: Update
Change Details: A correction has been published and is appended to both the HTML and PDF versions of this paper. The error has not been fixed in the paper.
Competing interests
: The authors declare no competing financial interests.