State-insensitive trapping of Rb atoms: linearly versus circularly polarized lights

TL;DR

This paper investigates the cancellation of differential ac Stark shifts in rubidium atoms using linearly and circularly polarized light by calculating dynamic polarizabilities with advanced relativistic methods, aiming to facilitate state-insensitive optical trapping.

Contribution

It provides new calculations of magic wavelengths for rubidium using relativistic coupled-cluster methods and explores the potential for state-insensitive trapping with circular polarization.

Findings

Calculated magic wavelengths for rubidium with linearly polarized light.

Compared results with previous studies for validation.

Discussed the feasibility of using circularly polarized light for trapping.

Abstract

We study the cancellation of differential ac Stark shifts in the 5s and 5p states of rubidium atom using the linearly and circularly polarized lights by calculating their dynamic polarizabilities. Matrix elements were calculated using a relativistic coupled-cluster method at the single, double and important valence triple excitations approximation including all possible non-linear correlation terms. Some of the important matrix elements were further optimized using the experimental results available for the lifetimes and static polarizabilities of atomic states. "Magic wavelengths" are determined from the differential Stark shifts and results for the linearly polarized light are compared with the previously available results. Possible scope of facilitating state-insensitive optical trapping schemes using the magic wavelengths for circularly polarized light are discussed. Using the optimized matrix elements, the lifetimes of the 4d and 6s states of this atom are ameliorated.