Abstract
Abstract Magneto-optical spectroscopy based on the transverse magneto-optical Kerr effect (TMOKE) is a sensitive method for investigating magnetically-ordered media. Previous studies were limited to the weak coupling regime where the spectral width of optical transitions considerably exceeded the Zeeman splitting in magnetic field. Here, we investigate experimentally and theoretically the transverse Kerr effect in the vicinity of comparatively narrow optical resonances in confined quantum systems. For experimental demonstration we studied the ground-state exciton resonance in a (Cd,Mn)Te diluted magnetic semiconductor quantum well, for which the strong exchange interaction with magnetic ions leads to giant Zeeman splitting of exciton spin states. For low magnetic fields in the weak coupling regime, the Kerr effect magnitude grows linearly with increasing Zeeman splitting showing a dispersive S-shaped spectrum, which remains almost unchanged in this range. For large magnetic fields in the strong coupling regime, the magnitude saturates, whereas the spectrum becomes strongly modified by the appearance of two separate peaks. TMOKE is sensitive not only to the sample surface but can also be used to probe in detail the confined electronic states in buried nanostructures if their capping layer is sufficiently transparent.
Highlights
The transverse magneto-optical Kerr effect (TMOKE) is one of the magneto-optical effects that emerge due to the Zeeman splitting of the electron levels in magnetic field [1]
For experimental demonstration we studied the ground-state exciton resonance in a (Cd,Mn)Te diluted magnetic semiconductor quantum well, for which the strong exchange interaction with magnetic ions leads to giant Zeeman splitting of exciton spin states
We focus on excitons in diluted magnetic semiconductor (DMS) quantum well (QW) structures
Summary
The transverse magneto-optical Kerr effect (TMOKE) is one of the magneto-optical effects that emerge due to the Zeeman splitting of the electron levels in magnetic field [1]. Resonant TMOKE with notable magnitude may be present even in nearly transparent media in the vicinity of the absorption band, which is provided by spectrally narrow optical resonances. Such phenomenon has been recently actively studied in hybrid magnetophotonic structures where the optical resonances are represented by electromagnetic modes such as surface plasmon polaritons [8, 9], waveguide modes [10, 11], or optical Tamm states [12]. We demonstrate resonant TMOKE for spectrally narrow excitonic resonances in a (Cd,Mn)Te/(Cd,Mg)Te QW structure
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