The Aharonov–Casher effect is a quantum mechanical phenomenon predicted in 1984 by Yakir Aharonov and Aharon Casher,[1] in which a traveling magnetic dipole is affected by an electric field.
It is dual to the Aharonov–Bohm effect, in which the quantum phase of a charged particle depends upon which side of a magnetic flux tube it comes through.
In the Aharonov–Casher effect, the particle has a magnetic moment and the tubes are charged instead.
It was observed in a gravitational neutron interferometer in 1989[2] and later by fluxon interference of magnetic vortices in Josephson junctions.
In both effects the particle acquires a phase shift (