Optical control of the spin state of two Mn atoms in a quantum dot

TL;DR

This paper demonstrates optical methods to control and probe the correlated spin states of two Mn atoms in a quantum dot, including tuning their energy levels via the optical Stark effect and measuring spin dynamics.

Contribution

It introduces a novel approach to manipulate and study coupled Mn spins in quantum dots using optical spectroscopy and the optical Stark effect.

Findings

Correlated Mn spins can be optically controlled in quantum dots.

Optical Stark effect enables tuning of collective spin state energies.

Spin orientation times are on the order of tens of nanoseconds.

Abstract

We report on the optical spectroscopy of the spin of two magnetic atoms (Mn) embedded in an individual quantum dot interacting with either a single electron, a single exciton and single trion. As a result of their interaction to a common entity, the Mn spins become correlated. The dynamics of this process is probed by time resolved spectroscopy, that permits to determine the optical orientation time in the range of a few tens of $ns$. In addition, we show that the energy of the collective spin states of the two Mn atoms can be tuned through the optical Stark effect induced by a resonant laser field.