Roche, B.
Roulleau, P.
Jullien, T.
Jompol, Y.
Farrer, I.
Ritchie, D.A.
Glattli, D.C.
Article History
Received: 1 October 2014
Accepted: 21 February 2015
First Online: 1 April 2015
Competing interests
: The authors declare no competing financial interests.