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25 April 2024 |
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Signatures of Spin Polarized Fermi Arcs in the Quasiparticle Interferences of CeBi | | Zhao Huang
; Christopher A. Lane
; Chao Cao
; Guo-Xiang Zhi
; Yu Liu
; Christian Matt
; J. E. Hoffman
; Dmitry Yarotski
; A. J. Taylor
; Jian-Xin Zhu
; | | Date: |
24 Aug 2020 | | Abstract: | We report 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 study of quasiparticle
interference (QPI) for a nonmagnetic impurity at the Bi site also uncovers
several features related to the Fermi arcs. Specifically, 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. | | Source: | arXiv, 2008.10628 | | Services: | Forum | Review | PDF | Favorites | |
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