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.
URI:	http://hdl.handle.net/2289/1203
ISSN:	0031-9007 1079-7114 (online)
Alternative Location:	http://link.aps.org/abstract/PRL/v88/e100403 http://arxiv.org/abs/quant-ph/0111123
Copyright:	(2002) by the American Physical Society
Appears in Collections:	Research Papers (A&A)

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