English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We consider a narrow magneto-dipole transition in the $^{169}$Tm atom at thewavelength of $1.14\,\mu$m as a candidate for a 2D optical lattice clock.Calculating dynamic polarizabilities of the two clock levels$[\text{Xe}]4f^{13}6s^2 (J=7/2)$ and $[\text{Xe}]4f^{13}6s^2 (J=5/2)$ in thespectral range from $250\,$nm to $1200\,$nm, we suggest the "magic" wavelengthfor the optical lattice at $807\,$nm. Frequency shifts due to black-bodyradiation (BBR), the van der Waals interaction, the magnetic dipole-dipoleinteraction and other effects which can perturb the transition frequency arecalculated. The transition at $1.14\,\mu$m demonstrates low sensitivity to theBBR shift corresponding to $8\times10^{-17}$ in fractional units at roomtemperature which makes it an interesting candidate for high-performanceoptical clocks. The total estimated frequency uncertainty is less than $5\times 10^{-18}$ in fractional units. By direct excitation of the $1.14\,\mu$mtransition in Tm atoms loaded into an optical dipole trap, we set the lowerlimit for the lifetime of the upper clock level $[\text{Xe}]4f^{13}6s^2(J=5/2)$ of $112\,$ms which corresponds to a natural spectral linewidthnarrower than $1.4\,$Hz. The polarizability of the Tm ground state was measuredby the excitation of parametric resonances in the optical dipole trap at$532\,$nm.

Inner-shell magnetic dipole transition in Tm atom as a candidate for optical lattice clocks