论文标题
巡回传输中的异常运输van der waals ferromagnets fe $ _n $ gete $ _2 $（\ emph {n} = 3，4，5）
Anomalous transport in itinerant van der Waals ferromagnets Fe$_n$GeTe$_2$ (\emph{n}=3, 4, 5)
论文作者
论文摘要
Ferromagnetic（FM）半法Fe $ _n $ gete $ _2 $（n = 3，4，5），在费米能源（E $ _F $）附近展示了几个受对称的受对称保护的带跨点或线，以及能量带的这些拓扑特性引起了有趣的运输特性。我们研究了这些材料采用第一原则计算和通过拟合第一原理计算的参数构建的紧密结合的哈密顿量。在存在n = 3,5的自旋轨道耦合（SOC）的情况下，观察到集中在淋巴结线上的大浆果曲率（BC）。已经研究了拓扑结节线和磁矩在异常霍尔电导率（AHC）$σ_{Xy} $和异常的Nernst电导率（ANC）$α__{XY} $上的相关性。我们发现$σ_{xy} = 150 $ s/cm的n = 3，295 s/cm的n = 4，在0 k时为n = 5的90 s/cm，而ANC则观察到$α_{xy} = 0.55 $ a/km的n = 3，0.10 a/km，n = 3，0.10 a/km，$ n = $ n = 5，0.80 a/km at e e et e et e et et e et e = 5，0.80 a/km at e e at = 5，0.80 a/km 温度。我们计算出的AHC值在0 K，即Fe $ _3 $ gete $ _2 $和90 s/cm fe $ _5 $ gete $ _2 $的150 s/cm，与实验报告的值一致。同样，Fe $ _5 $ gete $ _2 $的ANC的实验报告的值也接近我们在室温下（即0.10 A/km）计算的值。
Ferromagnetic (FM) semimetals Fe$_n$GeTe$_2$(n=3, 4, 5), exhibit several symmetry-protected band-crossing points or lines near the Fermi energy (E$_F$) and these topological properties of energy bands lead to interesting transport properties. We study these materials employing the first-principle calculations and the tight-binding Hamiltonian constructed by fitting the parameters of the first principles calculation. In the presence of spin-orbit coupling (SOC) for n=3,5 a large Berry curvature (BC) concentrated on the nodal lines is observed. The consequence of the correlation of the topological nodal line and magnetic moments on anomalous Hall conductivity (AHC) $σ_{xy}$ and anomalous Nernst conductivity (ANC) $α_{xy}$ have been investigated. We find $σ_{xy}=150$ S/cm for n=3, 295 S/cm for n=4, and 90 S/cm for n=5 at 0 K, while the ANC is observed as $α_{xy}=0.55$ A/Km for n=3, 0.10 A/Km for n=5, and 0.80 A/Km for n=4, at the E$_F$ at room temperature. Our calculated AHC values at 0 K, i.e., 150 S/cm for Fe$_3$GeTe$_2$ and 90 S/cm Fe$_5$GeTe$_2$, are consistent with the experimentally reported values. Also the experimentally reported value of ANC for Fe$_5$GeTe$_2$ is close to our calculated value at room temperature, i.e., 0.10 A/Km.
