Authors acknowledge financial support from Spanish Ministry
of Economy and Competitiveness through the “Severo
Ochoa” Programme for Centres of Excellence in R&D
(SEV-2015-0496), CONSOLIDER Excellence Network
(MAT2015-68994-REDC), COACHSUPENERGY project
(MAT2014-51778-C2-1-R, co-financed by the European Regional
Development Fund), European Research Council Advanced
Grant Award ERC-2014-ADG-669504, and from the
Catalan Government with 2014-SGR-753 and Xarmae. J.G.
and M.C. acknowledge Ramon y Cajal Program (RyC-2012-
11709 and RYC-2013-12448, respectively). The microscopy
work were conducted in the Laboratorio de Microscopias
Avanzadas at Instituto de Nanociencia de Aragon - Universidad
de Zaragoza (Zaragoza, Spain). Authors acknowledge
the LMA-INA for offering access to their instruments and
expertise.