Topology, Locality, and Aharonov-Bohm Effect with Neutrons

Details Topology, Locality, and Aharonov-Bohm Effect with Neutrons Topology, Locality, and Aharonov-Bohm Effect with Neutrons

1995-01-13

arxiv.org/abs/quant-ph/9501012v1

Phys.Rev.Lett. 74 (1995) 2847-2850

Physics

Quantum Physics

9 pages

Scientific paper

10.1103/PhysRevLett.74.2847

Recent neutron interferometry experiments have been interpreted as demonstrating a new topological phenomenon similar in principle to the usual Aharonov-Bohm (AB) effect, but with the neutron's magnetic moment replacing the electron's charge. We show that the new phenomenon, called Scalar AB (SAB) effect, follows from an ordinary local interaction, contrary to the usual AB effect, and we argue that the SAB effect is not a topological effect by any useful definition. We find that SAB actually measures an apparently novel spin autocorrelation whose operator equations of motion contain the local torque in the magnetic field. We note that the same remarks apply to the Aharonov-Casher effect.

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