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首页> 外文期刊>Physical review >Observation of nonreciprocal directional dichroism via electromagnon resonance in a chiral-lattice helimagnet Ba_3NbFe_3Si_2O_(14)
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Observation of nonreciprocal directional dichroism via electromagnon resonance in a chiral-lattice helimagnet Ba_3NbFe_3Si_2O_(14)

机译：在手性晶格直升机Ba_3NbFe_3Si_2O_（14）中通过电磁共振观察到不可逆的二向色性

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摘要

Nonreciprocal directional dichroism (NDD) is investigated on a magnetic resonance with both electric and magnetic dipole activities, i.e., electromagnon, for a chiral-lattice helimagnet Ba_3NbFe_3Si_2O_(14) by terahertz spectroscopy under the magnetic field. In the Voigt geometry, the electromagnon resonance causes the NDD in the helimagnetic phase in accord with the spin-driven ferroelectric polarization, whose polarity is uniquely selected owing to the structural chirality. In the Faraday geometry, all possible optical effects, including natural optical activity, magnetic optical activity and magnetochiral effect showing NDD, are separately evaluated by terahertz polarimetry technique. The NDD is manifested in the electromagnon resonance in the helimagnetic phase, while a formation of helimagnetic spin structure enhances the natural optical activity inherent to the structural chirality.
机译：在磁场下，通过太赫兹光​​谱研究了具有手电偶极和磁偶极子活动的磁共振的非可逆方向二向色性（NDD），即手性晶格直升机Ba_3NbFe_3Si_2O_（14）的电磁子。在Voigt几何形状中，电磁子共振导致自旋驱动铁电极化的电磁波相中的NDD，其极性由于结构手性而被唯一选择。在法拉第几何中，通过太赫兹极化技术分别评估了所有可能的光学效应，包括自然光学活性，磁光学活性和显示NDD的磁吸效应。 NDD在螺旋磁性相的电磁共振中表现出来，而螺旋磁性自旋结构的形成增强了结构手性固有的自然光学活性。

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  • 来源
    《Physical review》 |2016年第9期|094433.1-094433.7|共7页
  • 作者

    H. Narita; Y. Tokunaga; A. Kikkawa; Y. Taguchi; Y. Tokura; Y. Takahashi;

  • 作者单位

    Department of Applied Physics and Quantum Phase Electronic Center, University of Tokyo, Tokyo 113-8656, Japan;

    Department of Advanced Materials Science, University of Tokyo, Kashiwa 277-8561, Japan,RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan;

    RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan;

    RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan;

    Department of Applied Physics and Quantum Phase Electronic Center, University of Tokyo, Tokyo 113-8656, Japan,RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan;

    Department of Applied Physics and Quantum Phase Electronic Center, University of Tokyo, Tokyo 113-8656, Japan,RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan,PRESTO, Japan Science and Technology Agency, Chiyoda, Tokyo 102-8666, Japan;

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