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A quantum effect characterized by a dependence of the angular frequencyassociated with the confinement of a neutral particle to a quantum ring on thequantum numbers of the system and the Aharonov-Casher geometric phase isdiscussed. Then, it is shown that persistent spin currents can arise in atwo-dimensional quantum ring in the presence of a Coulomb-type potential. Aparticular contribution to the persistent spin currents arises from thedependence of the angular frequency on the geometric quantum phase.

An angular frequency dependence on the Aharonov-Casher geometric phase