Spin Nutation Induced by Atomic Motion in a Magnetic Lattice

TL;DR

This paper demonstrates that atomic motion through a magnetic lattice can induce spin nutation via resonant transitions, with control over dephasing achieved by adjusting the incident angle of the atomic beam.

Contribution

It introduces a novel method of inducing and controlling spin nutation in atoms using a magnetic lattice and atomic motion, expanding understanding of atom-field interactions.

Findings

Spin nutation was observed in a polarized rubidium atomic beam.

Resonant transitions occur when atomic velocity matches the lattice's spatial frequency.

Dephasing of spin nutation can be minimized by adjusting the incident angle.

Abstract

An atom moving in a spatially periodic field experiences a temporary periodic perturbation and undergoes a resonance transition between atomic internal states when the transition frequency is equal to the atomic velocity divided by the field period. We demonstrated that spin nutation was induced by this resonant transition in a polarized rubidium (Rb) atomic beam passing through a magnetic lattice. The lattice was produced by current flowing through an array of parallel wires crossing the beam. This array structure, reminiscent of a multiwire chamber for particle detection, allowed the Rb beam to pass through the lattice at a variety of incident angles. The dephasing of spin nutation was reduced by varying the incident angle.