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Magnetoelectiic spectroscopy of electronic transitions in the antiferromagnet Cr_2O_3

机译:反铁磁体Cr_2O_3中电子跃迁的磁电光谱

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摘要

A new type of optical spectroscopy, which makes it possible to investigate the electronic spectra of crystals without an inversion center that have macroscopically broken time-reversal symmetry and do not have a magnetic moment is proposed and implemented experimentally. The nonreciprocal rotation of die polarization plane and the ellipticity of light reflected from the magnetoelectric antiferromagnet Cr2O3 in the spectral range from 1.5 to 2.5 eV, which includes 4A2—>2E, 2TX, 4T2, 2T2 transitions, are measured. An analysis of the spectra provides new information on the symmetry of the excited states and shows that the interpretations of the excitonic part of the spectrum in the literature are not completely consistent with the data obtained.
机译:提出并通过实验实现了一种新型的光谱学,该光谱学使得可以研究不具有反转中心的晶体的电子光谱,该晶体具有宏观破坏的时间反转对称性并且不具有磁矩。测量了在1.5至2.5 eV的光谱范围(包括4A2→2E,2TX,4T2、2T2跃迁)中,磁极极化平面的不可逆旋转和从磁电反铁磁体Cr2O3反射的光的椭圆率。光谱分析提供了有关激发态对称性的新信息,并表明文献中光谱的激子部分的解释与获得的数据并不完全一致。

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