Bulletin of the American Physical Society
51st Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 65, Number 4
Monday–Friday, June 1–5, 2020; Portland, Oregon
Session D02: Novel applications of atomic spectroscopyInvited Live
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Chair: S.Charles Doret, Williams College Room: D133-134 |
Tuesday, June 2, 2020 2:00PM - 2:30PM Live |
D02.00001: Searches for new physics with precision spectroscopy of highly charged ions Invited Speaker: Julian Berengut Novel clocks using narrow reference transitions in highly charged ions (HCI) can provide unique leverage to detecting new physics, including variations in fundamental constants \footnote{S. Schiller, \textbf{Phys. Rev. Lett.} 98, 180801 (2007)} \footnote{J. C. Berengut, V. A. Dzuba, V. V. Flambaum, \textbf{Phys. Rev. Lett.} 105, 120801 (2010); J. C. Berengut, V. A. Dzuba, V. V. Flambaum, A. Ong, \textbf{Phys. Rev. Lett.} 106, 210802 (2011)} and violations of Lorentz invariance \footnote{R. Shaniv et al., \textbf{Phys. Rev. Lett.} 120, 103202 (2018)}. Ultra-precise quantum logic spectroscopy of trapped HCIs has now been demonstrated \footnote{P. Micke \textit{et al.}, \textbf{Nature}, doi:10.1038/s41586-020-1959-8 (2020)}, opening the door to optical-clock-level accuracy. The variety of highly charged ions available provides new opportunities for experiment \footnote{M. G. Kozlov, M. S. Safronova, J. R. Crespo L\'opez-Urrutia, P. O. Schmidt, \textbf{Rev. Mod. Phys.} 90, 045005 (2018)}. For example, choosing HCI near orbital crossings allows optical transitions with high sensitivity to new physics, and many opportunities to control systematics. I will present recent results of theory and experiment in this direction, with particular focus recently measured structure of Pr$^{9+}$ \footnote{H. Bekker \textit{et al.}, \textbf{Nat. Comm.} 10, 5651 (2019)}. [Preview Abstract] |
Tuesday, June 2, 2020 2:30PM - 3:00PM Live |
D02.00002: Cold Charged Radium Invited Speaker: Andrew Jayich Radium is the heaviest alkaline earth element, and thus when ionized it is isoelectronic to established trapped ion systems, such as Ca$^+$. Therefore the entire toolbox developed for trapped ion quantum information science and optical clocks is available to radium. The radium atom is appealing because its high mass and an octupole deformed nucleus combine to make it sensitive to new physics, especially when included in molecules. The mass and favorable wavelengths of the radium ion also make it a promising optical clock candidate. We discuss laser cooling and spectroscopy of the radium ion, production of radium-based molecular ions for addressing the baryon asymmetry problem, and work towards a radium ion optical clock. [Preview Abstract] |
Tuesday, June 2, 2020 3:00PM - 3:30PM Live |
D02.00003: Cold Highly Charged Ions for Fundamental Studies in the Vacuum Ultraviolet Invited Speaker: José R. Crespo López-Urrutia Sympathetic cooling of highly charged ions (HCI) [1] in combination with quantum logic spectroscopy [2] has recently allowed us improving the determination of optical frequencies in HCI by eight orders of magnitude [3]. This method will soon enable the study of transitions that are extremely sensitive to a possible variation of the fine-structure constant $\alpha$, with Pr$^{9+}$ as a very interesting case [4]. Moreover, HCI also possess extremely forbidden photon transitions of high multipolarity up to the x-ray region, while being protected from photoionization by the high binding energies of their outer electrons. Their very low polarizabilty strongly suppress systematic shifts such as those due to laser power and blackbody radiation.\\ We are currently building an experiment [5] in order to extend the range of frequency metrology into the vacuum-ultraviolet (VUV) region with HCI using a VUV frequency comb for excitation and spectroscopy, and a superconducting radio-frequency ion trap for storage. This setup should allow us to study bound-bound transitions of interest for QED and isotopic nuclear size studies at much higher photon energies than in atoms. Such investigations have been recently proposed, e.~g., for setting upper bounds for the strength of interactions beyond those presently known, and other fundamental studies [6]. The possibility of frequency metrology in the VUV region will also open new opportunities for other scientific fields.\\ \newline [1] L. Schm\"oger \textit{et al.}, {\bf 347}, 1233 (2015) \newline [2] P. Schmidt \textit{et al.}, {\bf 309}, 749 (2005) \newline [3] P. Micke \textit{et al.}, Nature (2020), DOI: s41586-020-1959-8 \newline [4] H. Bekker \textit{et al.}, Nat. Commun. {\bf 10}, 5651 (2019) \newline [5] J. Nauta \textit{et al.}, Nucl. Instrum. Methods B {\bf 408}, 285 (2017) \newline [6] M. Kozlov \textit{et al.}, Rev. Mod. Phys. {\bf 90}, 045005 (2018) [Preview Abstract] |
Tuesday, June 2, 2020 3:30PM - 4:00PM Live |
D02.00004: Nonlinear Isotope Shift in Yb$^{+}$ Search for Dark Matter Invited Speaker: Vladan Vuletic Recently it has been proposed to search for particles outside the Standard Model (SM) in an intermediate mass range by means of optical precision isotope shift spectroscopy. We perform such a measurement on two S $\rightarrow$ D quadrupole transitions for five isotopes of Yb $^{+}$ with zero nuclear spin with an accuracy of $\sim$ 300Hz. The corresponding King plot shows a 10 $^{ -6}$ deviation from linearity at the 3.3 $\sigma$ uncertainty level. A nonlinearity in the King plot can indicate a new-boson-mediated force beyond the Standard Model (SM), or arise from higher-order corrections within the SM. We identify the isotopic shape change of the nuclear charge distribution as a possible source of nonlinearity within the SM. We also report on progress towards more precise measurements on the quadrupole transitions and on a highly forbidden octupole transition that can be used to distinguish between effects within and outside the SM. [Preview Abstract] |
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