Observable Dirac-type singularities in Berry's phase and the monopole

Abstract

The physical reality and observability of 2nπBerry phases, as opposed to the usually considered modulo 2πtopological phases is demonstrated with the help of computer simulation of a model adiabatic evolution whose parameters are varied along a closed loop in the parameter space. Using the analogy of Berry's phase with the Dirac monopole, it is concluded that an interferometer loop taken around a magnetic monopole of strength n/2 yields an observable 2nπphase shift, where n is an integer. An experiment to observe the effect is proposed.

12 pages Latex, 3 postscript figures; submitted to Physical Review Letters 15 September 2000; revised 19 November 2001

References in corpus (1)

• Comment on "Neutron Interferometric Observation of Noncyclic Phase"

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