Accidental Degeneracy and Berry Phase of Resonant States

Details Accidental Degeneracy and Berry Phase of Resonant States Accidental Degeneracy and Berry Phase of Resonant States

1997-10-04

arxiv.org/abs/quant-ph/9710018v1

Physics

Quantum Physics

23 pages, 2 Postscript figures, LaTex, to be published in: Group 21: Symposium on Semigroups and Quantum Irreversibility (Proc

Scientific paper

10.1007/BFb0106786

We study the complex geometric phase acquired by the resonant states of an open quantum system which evolves irreversibly in a slowly time dependent environment. In analogy with the case of bound states, the Berry phase factors of resonant states are holonomy group elements of a complex line bundle with structure group C*. In sharp contrast with bound states, accidental degeneracies of resonances produce a continuous closed line of singularities formally equivalent to a continuous distribution of "magnetic" charge on a "diabolical" circle, in consequence, we find different classes of topologically inequivalent non-trivial closed paths in parameter space.

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