Theory of excitonic states in CaB6
Theory of excitonic states in CaB6
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CaB6 中的激子态理论
DOI：
10.1103/physrevb.66.184405
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发表时间：
2002
影响因子：
3.7
通讯作者：
A. Mishchenko
中科院分区：
文献类型：
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作者：
S. Murakami;Ryuichi Shindou;N. Nagaosa;A. Mishchenko
我们用Ginzburg-Landau理论研究了CaB 6的激子态。通过最小化自由能和与实验结果的比较，我们确定了两种可能的激子凝聚基态。它们都打破了时间反演和反转对称性。这导致各种磁性和光学性质。至于磁性，化合物被认为是一个反铁磁体，其自旋结构进行了预测。它将表现出磁电效应，在掺杂样品中以及在薄膜和粉末样品中观察到的铁磁性可以从这种效应中产生。预测了非互易光学效应和二次谐波产生等有趣的光学现象。他们对CaB 6的测量将澄清激子凝聚是否发生以及两种状态中的哪一种实现。
We study the excitonic states in CaB 6 in terms of the Ginzburg-Landau theory. By minimizing the free energy and by comparing with experimental results, we identify two possible ground states with exciton condensation. They both break time-reversal and inversion symmetries. This leads to various magnetic and optical properties. As for magnetic properties, the compound is expected to be an antiferromagnet, and its spin structure is predicted. It will exhibit the magnetoelectric effect, and observed ferromagnetism in doped samples and in thin-film and powder samples can arise from this effect. Interesting optical phenomena such as the nonreciprocal optical effect and the second-harmonic generation are predicted. Their measurement for CaB 6 will clarify whether exciton condensation occurs or not and which of the two states is realized.
DOI：
--
发表时间：
2002
期刊：
影响因子：
--
作者：
M. Udagawa;S. Nagai;N. Ogita;F. Iga;R. Kaji;Kazuyuki Sumida;J. Akimitsu;S. Kunii;Kazuya Z. Suzuki;H. Onodera;Y. Yamaguchi
通讯作者：
Y. Yamaguchi