Formation of long-range Rydberg molecules in two-component ultracold gases

TL;DR

This paper investigates heteronuclear Rydberg molecules in ultracold alkali gases, calculating their potential energy curves and proposing spectroscopic methods to probe atomic distributions at controllable length scales.

Contribution

It provides detailed calculations of potential energy curves for heteronuclear Rydberg molecules, emphasizing light alkali atoms and their hybridized electronic states.

Findings

Potential energy curves for heteronuclear Rydberg molecules are accurately calculated.

Spectroscopic detection can probe atomic densities and distributions.

Hybridized electronic states enable controllable excitation schemes.

Abstract

We present a comprehensive study of the diverse properties of heteronuclear Rydberg molecules, placing a special emphasis on those composed of the light alkali atoms, Li, Na, and K. Electron-atom scattering phase shifts, which determine the strength of the molecular bond, are calculated at very low energy and then used in a spin-dependent theoretical model to calculate accurate Rydberg molecule potential energy curves. The wide parameter range accessible by combining the various properties of different alkali atoms often leads to hybridized electronic states accessible via one or two photon excitation schemes. This analysis of heteronuclear molecules leads to a prediction that the relative densities and spatial distributions of atoms in an ultracold mixture can be probed at controllable length scales via spectroscopic detection of these molecules.