论文标题
电子结构和轨道Fermi表面拓扑中的等值半法NBAS $ _2 $和W $ _2 $ AS $ _3 $，带有极大的磁性
Electronic structure and open-orbit Fermi surface topology in isostructural semimetals NbAs$_2$ and W$_2$As$_3$ with extremely large magnetoresistance
论文作者
论文摘要
在过渡金属dipnictides $ tmpn_2 $（$ tm $ = ta，nb; $ pn $ = p，as，sb）中，实验频带结构的直接可视化非常大的磁磁性（XMR）的起源。在这里，使用角度分辨光发射光谱，我们绘制了NBAS $ _2 $的三维电子结构。开放式拓扑会导致Fermi表面（FSS）的不可忽略的部分，例如Isosstructural Complound Moas $ _2 $，在其中提议开放的FS来解释XMR的起源。我们进一步证明了W $ _2 $的整体FSS中的开放字符的观察为$ _3 $，这也是XMR半学的，$ C $ 12/$ m $ 1 aS $ tmpn_2 $ family和Moas $ _2 $，同一空间组为$ c $ 12/$ m $ 1。我们的结果表明，开放式FS拓扑可能是XMR材料之间的共享功能，其空间组为$ C $ 12/$ m $ 1，因此可能在确定相应的XMR效果以及电子孔补偿方面发挥作用。
In transition-metal dipnictides $TmPn_2$ ($Tm$ = Ta, Nb; $Pn$ = P, As, Sb), the origin of extremely large magnetoresistance (XMR) is yet to be studied by the direct visualization of the experimental band structures. Here, using angle-resolved photoemission spectroscopy, we map out the three-dimensional electronic structure of NbAs$_2$. The open-orbit topology contributes to a non-negligible part of the Fermi surfaces (FSs), like that of the isostructural compound MoAs$_2$, where the open FS is proposed to likely explain the origin of XMR. We further demonstrate the observation of open characters in the overall FSs of W$_2$As$_3$, which is also a XMR semimetal with the same space group of $C$12/$m$1 as $TmPn_2$ family and MoAs$_2$. Our results suggest that the open-orbit FS topology may be a shared feature between XMR materials with the space group of $C$12/$m$1, and thus could possibly play a role in determining the corresponding XMR effect together with the electron-hole compensation.
