title: Vacuum induced spin-1/2 Berry's phase.
abstract: We calculate the Berry phase of a spin-1/2 particle in a magnetic field considering the quantum nature of the field. The phase reduces to the standard Berry phase in the semiclassical limit and the eigenstate of the particle acquires a phase in the vacuum. We also show how to generate a vacuum induced Berry phase considering two quantized modes of the field which has an interesting physical interpretation.
authors.affiliation: Optics Section, The Blackett Laboratory, Imperial College, London SW7 2BZ, United Kingdom.
authors.forename: I
authors.initials: I
authors.lastname: Fuentes-Guridi
authors.forename: A
authors.initials: A
authors.lastname: Carollo
authors.forename: S
authors.initials: S
authors.lastname: Bose
authors.forename: V
authors.initials: V
authors.lastname: Vedral