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26 April 2024 |
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Article overview
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Hidden Weyl Fermions in Paramagnetic Electride Y$_2$C | | Liangliang Liu
; Chongze Wang
; Seho Yi
; Dou Kyun Kim
; Chul Hong Park
; Jun-Hyung Cho
; | | Date: |
7 Feb 2019 | | Abstract: | Recent experimental observations of Weyl fermions in materials opens a new
frontier of condensed matter physics. Based on first-principles calculations,
we here discover Weyl fermions in a two-dimensional layered electride material
Y$_2$C. We find that the Y 4$d$ orbitals and the anionic $s$-like orbital
confined in the interstitial spaces between [Y$_2$C]$^{2+}$ cationic layers are
hybridized to give rise to van Have singularities near the Fermi energy $E_{
m
F}$, which induce a ferromagnetic (FM) order via the Stoner-type instability.
This FM phase with broken time-reversal symmetry hosts the rotation-symmetry
protected Weyl nodal lines near $E_{
m F}$, which are converted into the
multiple pairs of Weyl nodes by including spin-orbit coupling (SOC). However,
we reveal that, due to its small SOC effects, Y$_2$C has a topologically
nontrivial drumhead-like surface state near $E_{
m F}$ as well as a very small
magnetic anisotropy energy with several ${mu}$eV per unit cell, consistent
with the observed surface state and paramagnetism at low temperatures below
${sim}$2 K. Our findings propose that the Brillouin zone coordinates of Weyl
fermions hidden in paramagnetic electride materials would fluctuate in momentum
space with random orientations of the magnetization direction. | | Source: | arXiv, 1902.2488 | | Services: | Forum | Review | PDF | Favorites | |
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