Dynamic polarizabilities and magic wavelengths for dysprosium

TL;DR

This paper theoretically investigates the dynamic polarizabilities of dysprosium's states and identifies magic wavelengths for laser trapping, aiding precision spectroscopy and cooling techniques.

Contribution

It introduces a method to determine magic wavelengths analytically near resonances, simplifying calculations for highly magnetic atoms.

Findings

Identified specific magic wavelengths for dysprosium states.

Provided an analytical formula for approximate magic wavelength calculation.

Facilitated improved laser cooling and trapping strategies.

Abstract

We theoretically study dynamic scalar polarizabilities of the ground and select long-lived excited states of dysprosium, a highly magnetic atom recently laser cooled and trapped. We demonstrate that there are a set of magic wavelengths of the unpoarized lattice laser field for each pair of states which includes the ground state and one of these excited states. At these wavelengths, the energy shift due to laser field is the same for both states, which can be useful for resolved sideband cooling on narrow transitions and precision spectroscopy. We present an analytical formula which, near resonances, allows for the determination of approximate values of the magic wavelengths without calculating the dynamic polarizabilities of the excited states.