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arXiv:0705.4428 · Physical Review A

Electron electric-dipole-moment experiment using electric-field quantized slow cesium atoms

Jason Amini, Charles T. Munger, Harvey Gould

Published Jun 21, 2007• 0 citations
arXivHTMLPDF

Abstract

A proof-of-principle electron electric-dipole-moment $(e\text{\ensuremath{-}}\mathrm{EDM})$ experiment using slow cesium atoms, nulled magnetic fields, and electric-field quantization has been performed. With the ambient magnetic fields seen by the atoms reduced to less than $200\phantom{\rule{0.3em}{0ex}}\mathrm{pT}$, an electric field of $6\phantom{\rule{0.3em}{0ex}}\mathrm{MV}∕\mathrm{m}$ lifts the degeneracy between states of unequal $\ensuremath{\mid}{m}_{F}\ensuremath{\mid}$ and, along with the low $(\ensuremath{\approx}3\phantom{\rule{0.3em}{0ex}}\mathrm{m}∕\mathrm{s})$ velocity, suppresses the systematic effect from the motional magnetic field. The low velocity and small residual magnetic field have made it possible to induce transitions between states and to perform state preparation, analysis, and detection in regions free of applied static magnetic and electric fields. This experiment demonstrates techniques that may be used to improve the $e\text{\ensuremath{-}}\mathrm{EDM}$ limit by two orders of magnitude, but it is not in itself a sensitive $e\text{\ensuremath{-}}\mathrm{EDM}$ search, mostly due to limitations of the laser system.

DOI
10.1103/physreva.75.063416

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We propose a new method to produce an electric and magnetic dipolar gas of ultracold dysprosium atoms. The pair of nearly degenerate energy levels of opposite parity, at 17513.33 cm^{-1} with electronic angular momentum J=10, and at 17514.50 cm^{-1} with J=9, can be mixed with an external electric field, thus inducing an electric dipole moment in the laboratory frame. For field amplitudes relevant to current-day experiments, i.e., an electric field of 5 kV/cm, we predict a large magnetic dipole moment up to 13 Bohr magnetons, and sizeable electric dipole moment up to 0.22 D. When a magnetic field is present, we show that the induced electric dipole moment is strongly dependent on the angle between the fields. The lifetime of the field-mixed levels is found in the millisecond range, thus allowing for suitable experimental detection and manipulation.
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