在 Weyl 半金属 NbAs 中发现动态手征反常。
The discovery of dynamic chiral anomaly in a Weyl semimetal NbAs.
作者信息
Yuan Xiang, Zhang Cheng, Zhang Yi, Yan Zhongbo, Lyu Tairu, Zhang Mengyao, Li Zhilin, Song Chaoyu, Zhao Minhao, Leng Pengliang, Ozerov Mykhaylo, Chen Xiaolong, Wang Nanlin, Shi Yi, Yan Hugen, Xiu Faxian
机构信息
State Key Laboratory of Surface Physics and Department of Physics, Fudan University, Shanghai, 200433, China.
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, 200062, China.
出版信息
Nat Commun. 2020 Mar 6;11(1):1259. doi: 10.1038/s41467-020-14749-4.
The experimental discovery of Weyl semimetals offers unprecedented opportunities to study Weyl physics in condensed matters. Unique electromagnetic response of Weyl semimetals such as chiral magnetic effect has been observed and presented by the axial θ E · B term in electromagnetic Lagrangian (E and B are the electric and magnetic field, respectively). But till now, the experimental progress in this direction in Weyl semimetals is restricted to the DC regime. Here we report experimental access to the dynamic regime in Weyl semimetal NbAs by combining the internal deformation potential of coupled phonons with applied static magnetic field. While the dynamic E · B field is realized, it produces an anomalous phonon activity with a characteristic angle-dependence. Our results provide an effective approach to achieve the dynamic regime beyond the widely-investigated DC limit which enables the coupling between the Weyl fermions and the electromagnetic wave for further study of novel light-matter interactions in Weyl semimetals.
外尔半金属的实验发现为在凝聚态物质中研究外尔物理提供了前所未有的机会。外尔半金属独特的电磁响应，如手征磁效应，已被观测到，并由电磁拉格朗日量中的轴矢项θ E·B（E和B分别为电场和磁场）所呈现。但迄今为止，外尔半金属在这一方向上的实验进展仅限于直流 regime。在此，我们报告通过将耦合声子的内禀形变势与外加静磁场相结合，对外尔半金属NbAs中的动态 regime 进行实验研究。当实现动态E·B场时，它会产生具有特征角度依赖性的反常声子活动。我们的结果提供了一种有效的方法，以实现超越广泛研究的直流极限的动态 regime，这使得外尔费米子与电磁波之间能够耦合，从而进一步研究外尔半金属中新型的光与物质相互作用。
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