title: Correspondence: On the nature of strong piezoelectricity in graphene on SiO2.
authors.affiliation: JARA-FIT and 2nd Institute of Physics, RWTH Aachen University, 52074 Aachen, Germany.|Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich, 52425 Jülich, Germany.
authors.forename: Christoph
authors.initials: C
authors.lastname: Stampfer
authors.affiliation: JARA-FIT and 2nd Institute of Physics, RWTH Aachen University, 52074 Aachen, Germany.|Physics and Material Science Research Unit, Université du Luxembourg, 1511 Luxembourg, Luxembourg.
authors.forename: Sven
authors.initials: S
authors.lastname: Reichardt