Analysis of large effective electric fields of weakly polar molecules for electron electric dipole moment searches

Abstract

The electric dipole moment of an electron (eEDM) is one of the sensitive probes of physics beyond the standard model. The possible existence of the eEDM gives rise to an experimentally observed energy shift, which is proportional to the effective electric field (Eeff) of a target molecule. Hence, an analysis of the quantities that enhance Eeff is necessary to identify suitable molecules for eEDM searches. In the context of such searches, it is generally believed that a molecule with larger electric polarization also has a larger value of Eeff. However, our Dirac-Fock and relativistic coupled-cluster singles and doubles calculations show that the hydrides of Yb and Hg have larger Eeff than those of fluorides, even though their polarizations are smaller. This is due to significant mixing of valence s and p orbitals of the heavy atom in the molecules. This mixing has been attributed to the energy differences of the valence atomic orbitals and the overlap of the two atomic orbitals based on the orbital interaction theory.

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Cited by in corpus (9)

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• Enhanced sensitivity of the electron electric dipole moment from YbOH: The role of theory
• Merits of Heavy-Heavy Molecules for Electron Electric Dipole Moment Searches
• Zeroth order regular approximation approach to electric dipole moment interactions of the electron
• Analysis of Enhancement factors of Parity and Time Reversal Violating Effects for Monofluorides
• Molecular enhancement factors for P, T-violating eEDM in BaCH${}_3$ and YbCH${}_3$ symmetric top molecules
• Role of electron-correlation in the $\mathcal{P},\mathcal{T}$-odd effects of CdH: A relativistic coupled-cluster investigation
• Relativistic Exact Two-Component Coupled-Cluster Study of Molecular Sensitivity Factors for Nuclear Schiff Moments
• Relativistic Coupled-Cluster Study of Diatomic Metal-Alkali Molecules for Electron Electric Dipole Moment Searches