Dynamic polarizabilities and magic wavelengths for dysprosium

Dzuba, V. A.; Flambaum, V. V.; Lev, Benjamin

doi:10.1103/physreva.83.032502

Cited by 39 publications

(72 citation statements)

References 31 publications

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“…In addition, we have determined a lower boundary for the excited state lifetime which is more than one order of magnitude larger than expected from theoretical predictions [6]. The dynamical polarizabilitiy of the excited state was determined relatively to the ground state dynamical polarizabilitiy and the ratio is in fair agreement with theory [20].…”

Section: Discussionsupporting

confidence: 68%

Spectroscopy of the 1001-nm transition in atomic dysprosium

2020

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We report on spectroscopy of cold dysprosium atoms on the 1001 nm transition and present measurements of the excited state lifetime which is at least 87.2(6.7) ms long. Due to the long excited state lifetime we are able to measure the ratio of the excited state polarizability to the ground state polarizability at 1064 nm to be 0.828(0.129) by parametric heating in an optical dipole trap. In addition we measure the isotope shifts of the three most abundant bosonic isotopes of dysprosium on the 1001 nm transition with an accuracy better than 30 kHz.

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Section: Discussionsupporting

confidence: 68%

Spectroscopy of the 1001-nm transition in atomic dysprosium

2020

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“…When we add the uncertainties in quadrature the branching fraction to the ground state is p = 0.9104 (7), where systematic shifts do not contribute as their sum is far below the measurement uncertainty. The measurement verifies theoretical techniques applied to this multielectron system that previously gave the only knowledge of the branching fraction [35][36][37], see Fig. 3.…”

supporting

confidence: 77%

Laser Cooling of Radium Ions

et al. 2019

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The unstable radium nucleus is appealing for probing new physics due to its high mass, octupole deformation and energy level structure. Ion traps, with long hold times and low particle numbers, are excellent for work with radioactive species, such as radium and radium-based molecular ions, where low activity, and hence low total numbers, is desirable. We address the challenges associated with the lack of stable isotopes in a tabletop experiment with a low-activity (∼ 10 µCi) source where we laser-cool trapped radium ions. With a laser-cooled radium ion we measured the 7p 2 P o 1/2 state's branching fractions to the ground state, 7s 2 S 1/2 , and a metastable excited state, 6d 2 D 3/2 , to be p = 0.9104(7) and 0.0896 (7), respectively. With a nearby tellurium reference line we measured the 7s 2 S 1/2 → 7p 2 P o 1/2 transition frequency, 640.096 63(6) THz.Radium, the heaviest alkaline earth element, has no stable isotopes. Singly ionized radium's simple electronic structure is amenable to optical pumping and laser cooling with wavelengths far from the challenging UV of most alkaline earth type ions. Radium's heavy nucleus, atomic number Z = 88, is well suited to searches for new physics, where sensitivity to symmetry breaking forces scales ∝ Z 3 [1, 2]. Certain radium isotopes, such as radium-225, have additional nuclear structure enhancements to CP (charge-parity) violating new physics [3,4]. Setting limits to sources of CP violation will help us understand the baryon asymmetry in the observed Universe [5].Pioneering work with trapped HfF + molecular ions has made significant progress in constraining leptonic CP violation, and has rigorously studied potential systematic effects for future experiments [6]. A complementary hadronic CP violation experiment with radioactive molecular ions RaOH + , or RaCOH + 3 [7] is an intriguing possibility, where the low densities and long hold times of ion traps are well matched to working with radioactive isotopes, because low total activity is desirable. The radium-225 nucleus (I = 1/2) has octupole deformed parity doublets that enhance sensitivity to CP violating forces by a factor of 100-1000 compared to the current touchstone atomic system, 199 Hg [8-10]. A radiumbased molecular ion, such as 225 RaOH + , has an additional sensitivity advantage because of the molecule's closely spaced, opposite parity electronic states in addition to the enhancements from the closely spaced, opposite parity radium nuclear states. Trapped and lasercooled radium ions could be the starting point for generating such radium-based molecular ions, where optical pumping Ra + may provide control of chemical reactions to produce RaOH + , as seen in other alkaline earth ions Ca + and Be + [11,12].A single laser-cooled radium ion is also a candidate for atomic parity nonconservation (PNC) measurements, as the massive radium nucleus enhances PNC effects and the simple electronic structure is appealing for the requisite calculations [13,14]. There are many radium isotopes, including several that were previo...

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“…[13] predicted the exceptionally small linewidth of 53 Hz, which explains our inability to detect the line with our current apparatus. This ultranarrow linewidth limits the transition's utility for a MOT, but along with the 741-nm line, the 1001-nm transition may be useful for resolved sideband cooling in an optical lattice [25][26][27]. This cooling technique may provide an alternative method [28] to evaporative cooling for the production of degenerate Dy gases.…”

Section: Alternative Laser-cooling Transitionsmentioning

confidence: 99%

Spectroscopy of a narrow-line laser-cooling transition in atomic dysprosium

Youn

Lev

2011

Phys. Rev. A

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The laser cooling and trapping of ultracold neutral dysprosium has been demonstrated recently using the broad, open, 421-nm cycling transition. Narrow-line magneto-optical trapping of Dy on longer wavelength transitions would enable the preparation of ultracold Dy samples suitable for loading optical dipole traps and subsequent evaporative cooling. We have identified the closed 741-nm cycling transition as a candidate for the narrow-line cooling of Dy. We present experimental data on the isotope shifts, the hyperfine constants A and B, and the decay rate of the 741-nm transition. In addition, we report a measurement of the 421-nm transition's linewidth, which agrees with previous measurements. We summarize the laser-cooling characteristics of these transitions as well as other narrow cycling transitions that may prove useful for cooling Dy.

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Dynamic polarizabilities and magic wavelengths for dysprosium

Cited by 39 publications

References 31 publications

Spectroscopy of the 1001-nm transition in atomic dysprosium

Spectroscopy of the 1001-nm transition in atomic dysprosium

Laser Cooling of Radium Ions

Spectroscopy of a narrow-line laser-cooling transition in atomic dysprosium

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