Spin-phonon coupling in single Mn doped CdTe quantum dot

Abstract

The spin dynamics of a single Mn atom in a laser driven CdTe quantum dot is addressed theoretically. Recent experimental results\cite{Le-Gall_PRL_2009,Goryca_PRL_2009,Le-Gall_PRB_2010}show that it is possible to induce Mn spin polarization by means of circularly polarized optical pumping. Pumping is made possible by the faster Mn spin relaxation in the presence of the exciton. Here we discuss different Mn spin relaxation mechanisms. First, Mn-phonon coupling, which is enhanced in the presence of the exciton. Second, phonon-induced hole spin relaxation combined with carrier-Mn spin flip coupling and photon emission results in Mn spin relaxation. We model the Mn spin dynamics under the influence of a pumping laser that injects excitons into the dot, taking into account exciton-Mn exchange and phonon induced spin relaxation of both Mn and holes. Our simulations account for the optically induced Mn spin pumping.

17 pages, 11 figures, submitted to PRB

References in corpus (5)

• Optically probing the fine structure of a single Mn atom in an InAs quantum dot
• Single Electron Transport in electrically tunable nanomagnets
• Brightening of dark excitons in a single quantum dot containing a single magnetic ion
• Single exciton spectroscopy of single-Mn doped InAs quantum dots
• Optical orientation of a single Mn spin in a quantum dot: Role of carrier spin relaxation

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