论文标题
Weyl Semimital WTE $ _2 $
Site-dependent Local Spin Susceptibility and Low-energy Excitation in a Weyl Semimetal WTe$_2$
论文作者
论文摘要
与位点相关的局部自旋敏感性通过$^{125} $ te核磁共振进行了研究，以Weyl半准WTE $ _2 $。核自旋晶格松弛率$ 1/t_1t $显示高温下温度$ t $平方的依赖性，然后以低于50 K的恒定行为。温度依赖性特征是线性交叉带周围出现的Weyl Fermions。 Knight Shift $ k $缩放到$ 1/t_1t $的平方根上，证实了低洼激励中主要的自旋贡献。观察到的$ K $和$ 1/t_1t $在四个TE站点上的依赖性显示了依赖网站的电子相关性和状态密度。 NMR光谱的角度曲线可提供各向异性超精细耦合张量，与TE站点上的$ 5p $ hole职业一致。
Site-dependent local spin susceptibility is investigated with $^{125}$Te nuclear magnetic resonance in a Weyl semimetal WTe$_2$. The nuclear spin-lattice relaxation rate $1/T_1T$ shows a dependence of the square of temperature $T$ at high temperatures, followed by a constant behavior below 50 K. The temperature dependence features Weyl fermions appearing around the linearly crossing bands. The Knight shift $K$ scales to the square root of $1/T_1T$, corroborating a predominant spin contribution in low-lying excitation. The observed dependence of $K$ and $1/T_1T$ on the four Te sites shows the site-dependent electron correlation and density of states. The angular profile of the NMR spectrum gives the anisotropic hyperfine coupling tensor, consistent with $5p$ hole occupations on Te sites.
