Liu Shuoqing, Shou Yichang, Zhou Xiang, Cheng Wangbin, Luo Zhaoming
Opt Express. 2020 Apr 13;28(8):10783-10793. doi: 10.1364/OE.388042.
We systematically study the lattice-dependent spin Hall effect of light (SHEL) in a Weyl semimetal (WSM) by considering left-handed polarization of the incident beam, and propose a new simple method to sense the lattice spacing precisely. It is revealed that the lattice spacing plays as essential a role as the Weyl points separation in the influences on the SHEL, and the variations of SHEL shifts are closely related to the real part of Hall conductivity. Specifically, the SHEL shifts increase to the peak values first and then decrease gradually with the increase of lattice spacing, and a quantitative relationship between the SHEL and the lattice spacing is established. By simulating weak measurement experiments, the lattice-dependent SHEL shifts are amplified and measured in desirable accuracies. Subsequently, we propose a method of precisely sensing the lattice spacing based on the amplified SHEL shifts. These researches provide theoretical basis for manipulating the SHEL in WSMs, and may open the possibility of fabricating the WSM parameter sensors.
我们通过考虑入射光束的左旋偏振，系统地研究了外尔半金属（WSM）中与晶格相关的光自旋霍尔效应（SHEL），并提出了一种精确测量晶格间距的新的简单方法。研究发现，晶格间距在影响SHEL方面与外尔点间距起着同样重要的作用，并且SHEL位移的变化与霍尔电导率的实部密切相关。具体而言，随着晶格间距的增加，SHEL位移先增加到峰值，然后逐渐减小，并建立了SHEL与晶格间距之间的定量关系。通过模拟弱测量实验，与晶格相关的SHEL位移被放大并以理想的精度进行测量。随后，我们提出了一种基于放大后的SHEL位移精确测量晶格间距的方法。这些研究为在外尔半金属中操纵SHEL提供了理论基础，并可能开启制造外尔半金属参数传感器的可能性。
