Optical Stark Effect and Dressed Excitonic States in a Mn-doped Quantum Dot

TL;DR

This paper demonstrates the optical control of spin states in a Mn-doped quantum dot using the Stark effect, revealing tunable excitonic states and Autler-Townes splitting through high-resolution spectroscopy.

Contribution

It reports the first observation of optically dressed spin states and the optical Stark effect on a single Mn atom in a quantum dot, enabling independent energy tuning of spin states.

Findings

Observation of spin-dependent optically dressed states.

Demonstration of optical Stark effect tuning of Mn spin states.

Detection of Autler-Townes splitting dependent on power, polarization, and detuning.

Abstract

We report on the observation of spin dependent optically dressed states and optical Stark effect on an individual Mn spin in a semiconductor quantum dot. The vacuum-to-exciton or the exciton-to-biexciton transitions in a Mn-doped quantum dot are optically dressed by a strong laser field and the resulting spectral signature is measured in photoluminescence. We demonstrate that the energy of any spin state of a Mn atom can be independently tuned using the optical Stark effect induced by a control laser. High resolution spectroscopy reveals a power, polarization and detuning dependent Autler-Townes splitting of each optical transition of the Mn-doped quantum dot. This experiment demonstrates a complete optical resonant control of the exciton-Mn system.