报告题目：Surface Chiral Berry Plasmons on Disordered Permalloys

报告人： 柳天宇 特聘研究员（天津大学）

报告时间：2023年04月14日（星期五）14：00-15：30

报告地点：在线报告（腾讯会议ID：368-4368-9521）

报告摘要：

We investigate the surface plasmons propagating on disordered bulk permalloys (Pys), whose magnetization breaks the time reversal symmetry, causing the surface plasmons to possess chirality in the absence of magnetic fields under the interplay of the anomalous Hall conductivity (AHC) and the boundary conditions at the surface. Based on the collisionless hydrodyanmic model, we incorporate the effect of interband transitions into the dispersion of surface plasmons. As we show, the AHC will split the forward and backward propagating surface plasmons into two modes, while the p-d transitions in bulk Py will work against the AHC, yielding slower propagation surface chiral Berry plasmons (CBPs), and even ceasing the presence of surface modes. The resulting surface CBP has a broad bandwidth ranging from visible light to infrared frequency. The free-field chirality may provide a new knob to control the chiral transport of light, as well as a new probe for detecting the intrinsic AHC in ferromagnetic metals.

报告人简介：

2002-2008年在天津大学先后取得应用物理学学士和凝聚态物理学硕士。2013年在美国密苏里大学哥伦比亚分校取得物理学博士，师从Prof. Giovanni Vignale。随后，前往美国爱荷华大学从事博士后的工作，合作导师Prof. Michael E. Flatté。2016年，入职天津大学理学院担任特聘研究员。荣获天津市青年人才计划和“北洋青年学者”。主要研究方向：自旋波自旋电子学、第一性原理计算、等离激元学。

参考文献：

[1] Zhang, S. S.-L. & Vignale, G. Chiral surface and edge plasmons in ferromagnetic conductors. Phys. Rev. B 97, 224408 (2018).

[2] Song, J. C. W. & Rudner, M. S. Chiral plasmons without magnetic field. Proceedings of the National Academy of Sciences 113, 4658–4663 (2016).

[3] Fetter, A. L. Edge magnetoplasmons in a bounded two-dimensional electron fluid. Phys. Rev. B 32, 7676–7684 (1985).