Rydberg spectrum of a single trapped Ca$^+$ ion: A Floquet analysis

TL;DR

This paper calculates the Rydberg spectrum of a single trapped Ca$^+$ ion using Floquet analysis, accounting for various internal and external couplings, and compares results with experimental observations.

Contribution

It introduces a comprehensive Floquet-based model for Rydberg states of trapped Ca$^+$ ions, including detailed coupling effects and accurate spectral predictions.

Findings

Accurate eigenenergies and quantum defect parameters obtained.

Trap-induced broadening of Rydberg lines characterized.

Comparison with experimental data validates the model.

Abstract

We compute the Rydberg spectrum of a single Ca$^+$ ion in a Paul trap by incorporating various internal and external coupling terms of the ion to the trap in the Hamiltonian. The coupling terms include spin-orbit coupling in Ca$^+$, charge (electron and ionic core) coupling to the radio frequency and static fields, ion-electron coupling in the Paul trap, and ion center-of-mass coupling. The electronic Rydberg states are precisely described by a one-electron model potential for e$^-$+Ca$^{2+}$, and accurate eigenenergies, quantum defect parameters, and static and tensor polarizabilities for a number of excited Rydberg states are obtained. The time-periodic rf Hamiltonian is expanded in the Floquet basis, and the trapping-field-broadened Rydberg lines are compared with recent observations of Ca$^+(23P)$ and Ca$^+(52F)$ Rydberg lines.