Tunable multi-photon Rabi oscillations in an electronic spin system

TL;DR

This paper demonstrates tunable multi-photon Rabi oscillations in a room-temperature multi-level electronic spin system, showing control over spin dynamics via static field orientation and microwave intensity, supported by analytical and numerical models.

Contribution

It introduces a method to control multi-photon Rabi oscillations in a multi-level spin system at room temperature, combining experimental tuning with theoretical modeling.

Findings

Multi-photon Rabi oscillations observed at room temperature.

Spin dynamics tunable via static field orientation and microwave power.

Excellent agreement between experimental data and theoretical models.

Abstract

We report on multi-photon Rabi oscillations and controlled tuning of a multi-level system at room temperature (S=5/2 for Mn2+:MgO) in and out of a quasi-harmonic level configuration. The anisotropy is much smaller than the Zeeman splittings, such as the six level scheme shows only a small deviation from an equidistant diagram. This allows us to tune the spin dynamics by either compensating the cubic anisotropy with a precise static field orientation, or by microwave field intensity. Using the rotating frame approximation, the experiments are very well explained by both an analytical model and a generalized numerical model. The calculated multi-photon Rabi frequencies are in excellent agreement with the experimental data.