As an alternative to the spin of a single charge in a  quantum dot (QD),  chemical doping  by a magnetic atom can be used to introduce a single spin in the QD matrix. When the latter is efficiently coupled to the QD exciton via exchange interaction, it can be manipulated by light. In this research topic, we aim  to investigate the system consisting of an InGaAs quantum dot doped by a single or a small number of Mn atoms.  Under appropriate magnetic field, these QDs exhibit transitions for both spin manipulation and non-destructive spin readout. The current challenge is to achieve efficient resonant optical excitation of specific transitions, which so far seems to be limited by spectral wandering. We expect significant progress by using optical resonator and better control of the electric environment, in order to demonstrate  the potential of Mn-doped QDs  for quantum applications.

References:

• J. Filipovic, A. Kundu, N. K. Vij, S. Fécherolle, A. Lemaître, S. Gupta, and O. Krebs, Coherent spectroscopy of a single Mn-doped InGaAs quantum dot, to be published (2024)
• O. Krebs, E. Baudin, and A. Lemaître. Exchange interaction-driven dynamic nuclear polarization in Mn-doped InGaAs/GaAs quantum dots. Phys. Rev. B 94, 195412 (2016). DOI:10.1103/PhysRevB.94.195412.
• O. Krebs and A. Lemaître. Optically Induced Coupling of Two Magnetic Dopant Spins by a Photoexcited Hole in a Mn-Doped InAs/GaAs Quantum Dot. Phys. Rev. Lett. 111(18), 187401 October (2013). 10.1103/PhysRevLett.111.187401.
• O. Krebs and A. Lemaître. Optical spectroscopy of InAs/GaAs quantum dots doped with a single Mn atom. In Quantum Dots : Optics, electronic transport and future applications, A. Tartakovskii, editor, chapter 13, 221–236. Cambridge University Press (2012).
• E. Baudin, E. Benjamin, A. Lemaître, and O. Krebs. Optical Pumping and Nondestructive Readout of a Single Magnetic Impurity Spin in an InAs/GaAs Quantum Dot. Phys. Rev. Lett. 107, 197402 (2011).