论文标题
CEBI的准粒子干扰中自旋极化Fermi弧的预测
Prediction of Spin Polarized Fermi Arcs in Quasiparticle Interference of CeBi
论文作者
论文摘要
我们预测，铁磁状态的宿比是韦尔半学。我们在密度功能理论中的计算表明，在动量路径$（0，0，k_z）$ $ 15 $ MEV}上存在两对Weyl节点，在上面的$ 15 $ MEV}，低于费米级别的$ 100 $ MEV。在$ e = 15 $ MEV处的镜像对称（010）面向面向的平板的表面上获得了两个相应的费米弧，并且由于杂交和一组琐碎的表面带，将两个弧线中断为三个部分。通过研究表面状态的自旋纹理，我们发现两个费米弧线非常自旋偏振，但在相反的方向上，可以通过自旋极化的ARPES测量来检测。我们对BI地点非磁杂质的准粒子干扰（QPI）的理论研究也揭示了与费米弧有关的几个特征。具体而言，我们预测，费米弧的自旋极化仅在自旋依赖性QPI频谱中导致分叉形特征，作为Weyl节点的指纹。
We predict that CeBi in the ferromagnetic state is a Weyl semimetal. Our calculations within density functional theory show the existence of two pairs of Weyl nodes on the momentum path $(0, 0, k_z)$ at $15$ meV} above and $100$ meV below the Fermi level. Two corresponding Fermi arcs are obtained on surfaces of mirror-symmetric (010)-oriented slabs at $E=15$ meV and both arcs are interrupted into three segments due to hybridization with a set of trivial surface bands. By studying the spin texture of surface states, we find the two Fermi arcs are strongly spin-polarized but in opposite directions, which can be detected by spin-polarized ARPES measurements. Our theoretical study of quasiparticle interference (QPI) for a nonmagnetic impurity at the Bi site also reveals several features related to the Fermi arcs. Specifically, we predict that the spin polarization of the Fermi arcs leads to a bifurcation-shaped feature only in the spin-dependent QPI spectrum, serving as a fingerprint of the Weyl nodes.
