Issue
EPL
Volume 82, Number 2, April 2008
Article Number 20005
Number of page(s) 5
Section General
DOI http://dx.doi.org/10.1209/0295-5075/82/20005
Published online 28 March 2008
EPL, 82 (2008) 20005
DOI: 10.1209/0295-5075/82/20005

Do fringes and trajectories shift equally in matter-wave interferometers? The example of photodetachment microscopy in a magnetic field

W. Chaibi, C. Blondel, C. Delsart and C. Drag

Laboratoire Aimé-Cotton (Centre National de la Recherche Scientifique), Université Paris-Sud bâtiment 505, F-91405 Orsay cedex, France, EU

christophe.blondel@lac.u-psud.fr

received 3 December 2007; accepted in final form 25 February 2008; published April 2008
published online 28 March 2008

Abstract
Matter-wave interferometers, either with electrons, atoms or molecules, owe their sensitivity to the accuracy of phase-shift measurements. One may, however, raise the question whether the shift undergone by interference fringes, when external forces are applied, actually differs from the shift of classical trajectories. For the case of a magnetic perturbation, we provide experimental evidence and a vector demonstration that interference patterns only undergo a global shift. The experiment is performed with the photodetachment microscope, with a uniform magnetic field superimposed over the whole volume accessible to the interfering electron. Identity of the fringe and trajectory shifts is established for any two-wave interferometer using charged particles, submitted to a magnetic field.

PACS
03.75.-b - Matter waves.
07.60.Ly - Interferometers.
32.80.Gc - Photodetachment of atomic negative ions.

© EPLA 2008