Measurement of the Aharonov-Casher geometric phase with a separated-arm atom interferometer Jonathan Gillot, Steven Lepoutre, Alexandre Gauguet, Jacques Vigué and Matthias Büchner Eur. Phys. J. D, 68 6 (2014) 168 Published online: 27 June 2014 DOI: 10.1140/epjd/e2014-50277-1