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Is the molecular Berry phase an artifact of the Born-Oppenheimer approximation?

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arxiv 1402.0227 v1 pith:HEFAXE3G submitted 2014-02-02 quant-ph physics.chem-ph

Is the molecular Berry phase an artifact of the Born-Oppenheimer approximation?

classification quant-ph physics.chem-ph
keywords phaseberryborn-oppenheimermassmolecularnon-analyticitynuclearappear
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We demonstrate that the molecular Berry phase and the corresponding non-analyticity in the electronic Born-Oppenheimer wavefunction is, in general, not a true topological feature of the exact solution of the full electron-nuclear Schr\"odinger equation. For a numerically exactly solvable model we show that a non-analyticity, and the associated geometric phase, only appear in the limit of infinite nuclear mass, while a perfectly smooth behavior is found for any finite nuclear mass.

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