Accurate Determination of the Dynamical Polarizability of Dysprosium

Ravensbergen, Cornelis; Corre, Vincent; Soave, Elisa; Kreyer, Marian; Tzanova, Slava; Kirilov, Emil; Grimm, Rudolf

doi:10.1103/physrevlett.120.223001

Cited by 39 publications

(42 citation statements)

References 52 publications

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“…A very favorable property of this mixture, as we pointed out already in Ref. [77], is the fact that the polarizability ratio of the two species in an infrared optical dipole trap nearly corresponds to the inverse mass ratio. This will allow to easily match the Fermi surfaces of both species even in the inhomogeneous environment of a harmonic trap, and to investigate pairing and superfluidity of unequal mass particles in the crossover from molecular BEC to a BCS-type regime.…”

Section: Discussionsupporting

confidence: 56%

Production of a degenerate Fermi-Fermi mixture of dysprosium and potassium atoms

et al. 2018

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We report on the realization of a mixture of fermionic 161 Dy and fermionic 40 K where both species are deep in the quantum-degenerate regime. Both components are spin-polarized in their absolute ground states, and the low temperatures are achieved by means of evaporative cooling of the dipolar dysprosium atoms together with sympathetic cooling of the potassium atoms. We describe the trapping and cooling methods, in particular the final evaporation stage, which leads to Fermi degeneracy of both species. Analyzing cross-species thermalization we obtain an estimate of the magnitude of the inter-species s-wave scattering length at low magnetic field. We demonstrate magnetic levitation of the mixture as a tool to ensure spatial overlap of the two components. The properties of the Dy-K mixture make it a very promising candidate to explore the physics of strongly interacting mass-imbalanced Fermi-Fermi mixtures. arXiv:1810.13437v1 [cond-mat.quant-gas]

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Section: Discussionsupporting

confidence: 56%

Production of a degenerate Fermi-Fermi mixture of dysprosium and potassium atoms

et al. 2018

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“…For instance, the dynamic (dipole) polarizability, which is of fundamental importance as it sets the strength of light-matter interactions, is theoretically challenging to estimate [10,11]. Several experimental efforts have been made to benchmark these theoretical models but have, so far, mainly addressed the polarizability of the ground state [12][13][14].…”

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confidence: 99%

Anisotropic light shift and magic polarization of the intercombination line of dysprosium atoms in a far-detuned dipole trap

et al. 2018

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We characterize the anisotropic differential ac-Stark shift for the Dy 626 nm intercombination transition, induced in a far-detuned 1070 nm optical dipole trap, and observe the existence of a "magic polarization" for which the polarizabilities of the ground and excited states are equal. From our measurements we extract both the scalar and tensorial components of the dynamic dipole polarizability for the excited state, α s E = 188(12) α0 and α t E = 34(12) α0, respectively, where α0 is the atomic unit for the electric polarizability. We also provide a theoretical model allowing us to predict the excited state polarizability and find qualitative agreement with our observations. Furthermore, we utilize our findings to optimize the efficiency of Doppler cooling of a trapped gas, by controlling the sign and magnitude of the inhomogeneous broadening of the optical transition. The resulting initial gain of the collisional rate allows us, after forced evaporation cooling, to produce a quasi-pure Bose-Einstein condensate of 162 Dy with 3 × 10 4 atoms.

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“…3(c) and it shows a resonance at f g = 1.146(60) kHz. From the resonances we obtain the ratio of the polariz-abilities analog to [19]:…”

Section: Measurement Of the Excited State Polarizabilitymentioning

confidence: 99%

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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Accurate Determination of the Dynamical Polarizability of Dysprosium

Cited by 39 publications

References 52 publications

Production of a degenerate Fermi-Fermi mixture of dysprosium and potassium atoms

Production of a degenerate Fermi-Fermi mixture of dysprosium and potassium atoms

Anisotropic light shift and magic polarization of the intercombination line of dysprosium atoms in a far-detuned dipole trap

Spectroscopy of the 1001-nm transition in atomic dysprosium

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