Transverse magneto-optical Kerr effect at narrow optical resonances

Nanophotonics

article

Olga V. Borovkova¹  Anatoly K. Zvezdin¹  Dmitri R. Yakovlev³  Manfred Bayer³  Felix Spitzer³  Vladimir I. Belotelov¹  Ilya A. Akimov³  Alexander N. Poddubny⁴  Grzegorz Karczewski⁶  Maciej Wiater⁶  Tomasz Wojtowicz⁷ 

[1] Russian Quantum Center;Prokhorov General Physics Institute RAS;Technische Universität Dortmund;Ioffe Institute, Russian Academy of Sciences;Moscow State University;Institute of Physics, Polish Academy of Sciences;International Research Centre MagTop, Institute of Physics, Polish Academy of Sciences

关键词: Nanophotonics;    semiconductor nanostructures;    excitons;    magneto-optics;    magneto-optical Kerr effects;   

DOI  :  10.1515/nanoph-2018-0187

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

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.

【 授权许可】

CC BY