论文标题
磁性Weyl Semimetal Co $ _3 $ sn $ _2 $ S $ _2 $
Second-harmonic voltage responce for the magnetic Weyl semimetal Co$_3$Sn$_2$S$_2$
论文作者
论文摘要
我们通过实验研究了磁性Weyl半离子Co $ _3 $ sn $ _2 $ s $ _2 $的纵向和横向第二谐波电压响应对交流电流的响应。与先前观察到的非磁性Weyl和Dirac半含量的浆果 - 外色诱导的非线性霍尔效应相反，第二谐波横向电压显示出对CO $ _3 $ SN $ _2 $ _2 $ _2 $ S $ s $ s $ _2 $的复杂相互作用的复杂相互作用。在高磁场中，它是类似Seebeck的Square-B定律，而低场行为则是线性和敏感的，对样品磁化方向敏感。对于非线性霍尔效应，也可以预期后者对Weyl半法中的Seebeck效应做出了贡献。因此，与非磁性Weyl和Dirac材料不同，热电效应在Co $ _3 $ sn $ _2 $ s $ _2 $中很重要。
We experimentally investigate longitudinal and transverse second-harmonic voltage response to ac electrical current for a magnetic Weyl semimetal Co$_3$Sn$_2$S$_2$. In contrast to the previously observed Berry-curvature induced non-linear Hall effect for non-magnetic Weyl and Dirac semimetals, the second-harmonic transverse voltage demonstrates sophisticated interplay of different effects for Co$_3$Sn$_2$S$_2$. In high magnetic fields, it is of Seebeck-like square-B law, while the low-field behavior is found to be linear and sensitive to the direction of sample magnetization. The latter can be expected both for the non-linear Hall effect and for the surface state contribution to the Seebeck effect in Weyl semimetals. Thus, thermoelectric effects are significant in Co$_3$Sn$_2$S$_2$, unlike non-magnetic Weyl and Dirac materials.
