Dynamics of a Mn spin coupled to a single hole confined in a quantum dot

Abstract

Using the emission of the positively charged exciton as a probe, we analyze the dynamics of the optical pumping and the dynamics of the relaxation of a Mn spin exchange-coupled with a confined hole spin in a II-VI semiconductor quantum dot. The hole-Mn spin can be efficiently initialized in a few tens of $ns$ under optical injection of spin polarized carriers. We show that this optical pumping process and its dynamics are controlled by electron-Mn flip-flops within the positively charged exciton-Mn complex. The pumping mechanism and its magnetic field dependence are theoretically described by a model including the dynamics of the electron-Mn complex in the excited state and the dynamics of the hole-Mn complex in the ground state of the positively charged quantum dot. We measure at zero magnetic field a spin relaxation time of the hole-Mn spin in the $\mu s$ range or shorter. This hole-Mn spin relaxation is induced by the presence of valence band mixing in self-assembled quantum dots.

References in corpus (3)

• Optically probing the fine structure of a single Mn atom in an InAs quantum dot
• Fine structure of exciton excited levels in a quantum dot with a magnetic ion
• Electron-nuclei spin dynamics in II-VI semiconductor quantum dots

Cited by in corpus (6)

• Nanomaterials for Quantum Information Science and Engineering
• A hole-Cr${}^{+}$ nano-magnet in a semiconductor quantum dot
• Optical control of an individual Cr spin in a semiconductor quantum dot
• Angle-resolved optically detected magnetic resonance as a tool for strain determination in nanostructures
• Coupling of the triplet states of a negatively charged exciton in a quantum dot with the spin of a magnetic atom
• Spin dynamics of positively charged excitons in Cr${}^{+}$-doped quantum dots probed by resonant photoluminescence