Spin dynamics of positively charged excitons in Cr${}^{+}$-doped quantum dots probed by resonant photoluminescence

Abstract

We study the dynamics of the spin system that consist of a positively charged II-VI semiconductor quantum dot doped with a single Cr${}^{+}$ ion. The resonant photoluminescence (PL) of the positively charged exciton coupled with the Cr${}^{+}$ spin is used to analyze the main spin relaxation channels. The intensity of the resonant PL is reduced by an optical pumping of the spin of the resident hole-Cr${}^{+}$ complex that can be seen as a nano-magnet. The spin memory can be partially erased by a non-resonant optical excitation. This leads to an increase of the resonant PL signal. The resonant PL is co-circularly polarized and corresponds to relaxation channels that conserve the Cr${}^{+}$ spin $|S_z|$. The observation in the resonant-PL excitation spectra of optical transitions with a change of the Cr${}^{+}$ spin permits to determine the magnetic anisotropy of the magnetic atom. Optical pumping, auto-correlation measurements and the power dependence of the PL intensity distribution show that the effective temperature of the hole-Cr${}^{+}$ spin system is affected by the optical excitation through the local generation of phonons.

References in corpus (19)

• Optically probing the fine structure of a single Mn atom in an InAs quantum dot
• Designing quantum dots for solotronics
• Universal mechanism of spin relaxation in solids
• Quantum interference and phonon-mediated back-action in lateral quantum dot circuits
• Inducing micromechanical motion by optical excitation of a single quantum dot
• Phonon-mediated vs. Coulombic Back-Action in Quantum Dot circuits
• Optical control of the spin state of two Mn atoms in a quantum dot
• Individual Cr atom in a semiconductor quantum dot: optical addressability and spin-strain coupling
• Magneto-optics of excitons interacting with magnetic ions in CdSe/CdMnS colloidal nanoplatelets
• Resonant optical pumping of a Mn spin in a strain free quantum dot
• Strain induced coherent dynamics of coupled carriers and Mn spins in a quantum dot
• Spin-phonon coupling in single Mn doped CdTe quantum dot
• Electron-nuclei spin dynamics in II-VI semiconductor quantum dots
• Acoustic Phonon Sideband Dynamics During Polaron Formation in a Single Quantum Dot
• Dynamics of a Mn spin coupled to a single hole confined in a quantum dot
• Spin dynamics of an individual Cr atom in a semiconductor quantum dot under optical excitation
• A hole-Cr${}^{+}$ nano-magnet in a semiconductor quantum dot
• Influence of non-equilibrium phonons on the spin dynamics of a single Cr atom
• Resonant photoluminescence and dynamics of a hybrid Mn-hole spin in a positively charged magnetic quantum dot

Cited by in corpus (1)

• Single vanadium ion magnetic dopant in an individual CdTe/ZnTe quantum dot