Proposed search for an electric-dipole moment using laser-cooled $^{171}$Yb atoms

Details Proposed search for an electric-dipole moment using laser-cooled $^{171}$Yb atoms Proposed search for an electric-dipole moment using laser-cooled $^{171}$Yb atoms

2005-10-11

arxiv.org/abs/physics/0510087v1

Eur. Phys. J. D 32, 33-38 (2005)

Physics

Atomic Physics

7 pages, 3 figures

Scientific paper

10.1140/epjd/e2004-00175-2

We propose an experiment to search for a permanent atomic electric-dipole moment (EDM) using laser-cooled $^{171}$Yb atoms launched in an atomic fountain. A uniform B field sets the quantization axis, and the Ramsey separated-oscillatory-fields method is used to measure the Zeeman precession frequency of the atoms. Laser beams of appropriate polarization are used for preparation and detection in a given magnetic sublevel. The signature of an EDM is a shift in the Ramsey resonance correlated with application of a large E field. The precision is expected to be at least 20 times better than current limits because the use of a cold atomic beam allows application of E field 10 times larger than in a vapor cell, and the interaction time with the E field is 200 times larger compared to a thermal beam. The leading source of systematic error in beam experiments, the (E x v/c) motional magnetic field, is reduced considerably because of the near-perfect reversal of velocity between up and down trajectories through the E-field region.

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