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 (17)

• Microwave Oscillations of a Nanomagnet Driven by a Spin-Polarized Current
• Spin-flip transitions between Zeeman sublevels in semiconductor quantum dots
• Optical manipulation of a single Mn spin in a CdTe-based quantum dot
• Optical spin orientation of a single manganese atom in a quantum dot
• Optically probing the fine structure of a single Mn atom in an InAs quantum dot
• Universal mechanism of spin relaxation in solids
• Geometrical effects on the optical properties of quantum dots doped with a single magnetic atom
• Ferromagnetism mediated by few electrons in a semimagnetic quantum dot
• Single exciton spectroscopy of semimagnetic quantum dots
• Single Electron Transport in electrically tunable nanomagnets
• Optical initialization, readout and dynamics of a Mn spin in a quantum dot
• Selective optical manipulation of the spin state of a single magnetic impurity in a semiconductor quantum dot
• Optical probing of spin fluctuations of a single magnetic atom
• Brightening of dark excitons in a single quantum dot containing a single magnetic ion
• Magnetic anisotropy of singly Mn-doped InAs/GaAs quantum dots
• 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

Cited by in corpus (16)

• Designing quantum dots for solotronics
• Helical edge states coupled to a spin bath: Current-induced magnetization
• In-plane radiative recombination channel of a dark exciton in self-assembled quantum dots
• Optical control of the spin state of two Mn atoms in a quantum dot
• Resonant optical pumping of a Mn spin in a strain free quantum dot
• Spin dynamics of a Mn atom in a semiconductor quantum dot under resonant optical excitation
• Dynamics of a Mn spin coupled to a single hole confined in a quantum dot
• Optical signals of spin switching using the optical Stark effect in a Mn doped quantum dot
• Tuning of Exciton States in a Magnetic Quantum Ring
• Spin dynamics of an individual Cr atom in a semiconductor quantum dot under optical excitation
• Resonant optical control of the spin of a single Cr atom in a quantum dot
• Spin relaxation in CdTe quantum dots with a single Mn atom
• Resonant photoluminescence and dynamics of a hybrid Mn-hole spin in a positively charged magnetic quantum dot
• Optical control of an individual Cr spin in a semiconductor quantum dot
• Spin dynamics of positively charged excitons in Cr${}^{+}$-doped quantum dots probed by resonant photoluminescence
• Mechanisms of optical orientation of an individual Mn${}^{2+}$ ion spin in a II-VI quantum dot