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arXiv · 2008.10628

Prediction of Spin Polarized Fermi Arcs in Quasiparticle Interference of CeBi

Zhao Huang·Christopher A. Lane·Chao Cao·Guo-Xiang Zhi·Yu Liu·Christian Matt·Brinda Kuthanazhi·Paul C. Canfield·Dmitry Yarotski·A. J. Taylor·Jian-Xin Zhu
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Abstract

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.

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Zhao Huang, Christopher A. Lane, Chao Cao, Guo-Xiang Zhi, Yu Liu, Christian Matt, Brinda Kuthanazhi, Paul C. Canfield, Dmitry Yarotski, A. J. Taylor, Jian-Xin Zhu. 2020-08-24. Prediction of Spin Polarized Fermi Arcs in Quasiparticle Interference of CeBi. https://doi.org/10.1103/physrevb.102.235167

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