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Title: Observable Dirac-type singularities in Berry's phase and the monopole
Authors: Bhandari, R.
Issue Date: 11-Mar-2002
Publisher: American Physical Society
Citation: Physical Review Letters, 2002, Vol.88, 100403
Abstract: A three-dimensional generalization of the sign-change ( π phase shift) rule for adiabatic cycles of spin-1/2 or two-state wave functions encircling a degeneracy in the parameter space of the Hamiltonian yields a Dirac-type singularity wherein any closed circuit of the adiabatic cycle in which the degeneracy is “looped” results in an observable ±2π phase shift. It is concluded that an interferometer loop similarly taken around a magnetic monopole of strength n/2 yields an observable ±2nπ phase shift, n being an integer.
ISSN: 0031-9007
1079-7114 (online)
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Copyright: (2002) by the American Physical Society
Appears in Collections:Research Papers (A&A)

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