Optically detected magnetic resonance in CdMnSe/ZnSe submonolayer quantum wells

Abstract

Fine structure of isolated Mn 2þ ions in CdMnSe/ZnSe quantum wells (QWs) is revealed by optically detected magnetic resonance (ODMR) recorded by monitoring both exciton emission and intra-Mn luminescence in the presence of simultaneous microwave irradiation. A large decrease of photoluminescence (PL) intensity of excitons and an increase of PL intensity of Mn 2þ ions is observed when an applied magnetic field satisfies the Mn 2þ electron paramagnetic resonance (EPR) condition. This suggests that a spin-dependent energy transfer from excitons to intra-Mn excitations occurs at the EPR condition.

Optically detected magnetic resonance in CdSe/CdMnS nanoplatelets

“…This increase is typical for bulk DMSs 43 and was reported also for DMS quantum wells and quantum dots. 44,45 It is explained by the magnetic-fieldinduced suppression of the spin-dependent Auger process, in which an exciton transfers its energy to a Mn 2+ ion. The Auger suppression is related to the polarization of both the Mn 2+ spins and the exciton spin by the magnetic field, resulting in relative spin configurations that are unfavorable for this process.…”

Angle-resolved optically detected magnetic resonance as a tool for strain determination in nanostructures

“…The change in the optical properties of the sample can be detected with various experimental techniques. For example, previous ODMR studies of Diluted Magnetic Semiconductors were based on changes in Faraday rotation 57 , in the amplitude of photoluminescence or in the spectral shift of photoluminescence line [58][59][60][61][62][63][64] . In this work, we use the energy position of the neutral exciton emission line (X) from photoexcited QW to detect local magnetization in the QW layer (fig.…”