# Species-selective confinement of atoms dressed with multiple radiofrequencies

## TL;DR

This paper presents a method for species-selective confinement of ultracold atoms using multiple radiofrequency magnetic dressing, enabling controlled overlap and potential configurations for different atomic species.

## Contribution

It introduces a scheme employing multiple radiofrequencies to achieve species-specific magnetic potentials, extending to complex configurations like double wells.

## Key findings

- Demonstrates control over atomic species overlap using dual-frequency dressing.
- Extends the scheme to a four-radiofrequency setup for complex potential landscapes.
- Applicable to various atomic mixtures beyond Rb isotopes.

## Abstract

Methods to manipulate the individual constituents of an ultracold quantum gas mixture are essential tools for a number of applications, for example the direct quantum simulation of impurity physics. We investigate a scheme in which species-selective control is achieved using magnetic potentials dressed with multiple radiofrequencies, exploiting the different Land\'e g-factors of the constituent atomic species. We describe a mixture dressed with two frequencies, where atoms are confined in harmonic potentials with a controllable degree of overlap between the two atomic species. This is then extended to a four radiofrequency scheme in which a double well potential for one species is overlaid with a single well for the other. The discussion is framed with parameters that are suitable for a 85Rb and 87Rb mixture, but is readily generalised to other combinations.