Observation of a narrow inner-shell orbital transition in atomic erbium at 1299 nm

• URL: http://arxiv.org/abs/2105.01438v1
• Date: Tue, 4 May 2021 11:56:18 GMT
• Title: Observation of a narrow inner-shell orbital transition in atomic erbium at 1299 nm
• Authors: A. Patscheider, B. Yang, G. Natale, D. Petter, L. Chomaz, M. J. Mark, G. Hovhannesyan, M. Lepers, and F. Ferlaino
• Abstract summary: We report on the observation and coherent excitation of atoms on the narrow inner-shell orbital transition. This transition corresponds to a wavelength of 1299 nm and is optically closed. We demonstrate coherent control of the atomic state and extract a lifetime of 178( ms) which corresponds to a linewidth of 0.9(1) Hz.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We report on the observation and coherent excitation of atoms on the narrow inner-shell orbital transition, connecting the erbium ground state $[\mathrm{Xe}] 4f^{12} (^3\text{H}_6)6s^{2}$ to the excited state $[\mathrm{Xe}] 4f^{11}(^4\text{I}_{15/2})^05d (^5\text{D}_{3/2}) 6s^{2} (15/2,3/2)^0_7$. This transition corresponds to a wavelength of 1299 nm and is optically closed. We perform high-resolution spectroscopy to extract the $g_J$-factor of the $1299$-nm state and to determine the frequency shift for four bosonic isotopes. We further demonstrate coherent control of the atomic state and extract a lifetime of 178(19) ms which corresponds to a linewidth of 0.9(1) Hz. The experimental findings are in good agreement with our semi-empirical model. In addition, we present theoretical calculations of the atomic polarizability, revealing several different magic-wavelength conditions. Finally, we make use of the vectorial polarizability and confirm a possible magic wavelength at 532 nm.

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