A protocol to realize triatomic ultralong range Rydberg molecules in an ultracold KRb gas

TL;DR

This paper proposes a practical method to create triatomic ultralong-range Rydberg molecules in ultracold KRb gases by exploiting resonant coupling and anisotropic interactions, enhancing binding and Franck-Condon factors.

Contribution

It introduces an experimentally feasible scheme to produce TURMs in ultracold KRb gases using near resonant coupling and anisotropic dipole interactions.

Findings

Enhanced TURM binding due to near resonant coupling

Favorable Franck-Condon factors achieved

Schemes demonstrated for potassium and rubidium excitations

Abstract

We propose an experimentally realizable scheme to produce triatomic ultralong-range Rydberg molecules (TURM), formed in ultracold KRb traps. A near resonant coupling of the non-zero quantum defect Rydberg levels with the KRb molecule in N=0 and N=2 rotational levels, is engineered which exploits the unique Rydberg electron-molecule anisotropic dipole interaction. This near resonant coupling enhances the TURM binding and produces favorable Franck-Condon factors. Schemes for both postassium and rubidium excitations are demonstrated.