STIRAP Pathway to Rovibronic-ground-state LiRb Guided by a Genetics-based Deperturbation Analysis

Abstract

Stimulated Raman Adiabatic Passage (STIRAP) is a powerful technique for producing ultracold molecules. The efficiency of the STIRAP process largely relies on the transition dipole moment (TDM) matrix elements for the upleg and downleg transitions, whose calculation depends heavily on the accuracy of potential energy curves (PECs) and spin-orbit (SO) coupling terms. In our recent study, we combined genetic algorithm with traditional optimization methods to optimize the theoretically calculated PECs and SO coupling terms for the LiRb molecule. Based on the optimised physical model, we calculated the TDM matrix elements for STIRAP with specific SO-coupled electronic states as the intermediate state, and propose several STIRAP pathways to transfer the weakly bound LiRb molecules to their rovibronic ground state. These findings provide a strong foundation for the experimental exploration of optimal pathways for ultracold LiRb molecule production.