Modeling the dichroic absorption band edge and light-induced magnetism in EuTe
Modeling the dichroic absorption band edge and light-induced magnetism in EuTe
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DOI：
10.1103/physrevb.77.035204
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发表时间：
2008-01-01
影响因子：
3.7
通讯作者：
Abramof, E.
中科院分区：
文献类型：
--
作者：
Henriques, A. B.;Manfrini, M. A.;Abramof, E.
在5d导带原子模型的框架下研究了EuTe的带边光吸收。分析了弛豫反铁磁有序和外磁场诱导的铁磁有序。对于铁磁排列，吸收的特征是由一个巨大的二向色性双线窄线。在反铁磁顺序中，光谱蓝移，变得更宽和更弱，并且二向色性被抑制。这些结果与我们以前发表的关于EuTe和EuSe的实验观察结果[B 72，155337（2005）]在定性和定量上非常一致。还讨论了通过以与带隙共振的光子能量照射材料来诱导铁磁有序的可能性。
The band-edge optical absorption in EuTe is studied in the framework of the 5d conduction band atomic model. Both relaxed antiferromagnetic order, and ferromagnetic order induced by an external magnetic field, were analyzed. For ferromagnetic arrangement, the absorption is characterized by a hugely dichroic doublet of narrow lines. In the antiferromagnetic order, the spectrum is blueshifted, becomes much broader and weaker, and dichroism is suppressed. These results are in excellent qualitative and quantitative agreement with experimental observations on EuTe and EuSe published by us previously [Phys. Rev. B 72, 155337 (2005)]. The possibility of inducing ferromagnetic order by illuminating the material at photon energies resonant with the band gap is also discussed.