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Emerging chiral edge states from the confinement of a magnetic Weyl semimetal in Co$_3$Sn$_2$S$_2$

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arxiv 1712.08115 v3 pith:YV5FNZII submitted 2017-12-21 cond-mat.str-el cond-mat.mtrl-sci

Lukas Muechler , Enke Liu , Jacob Gayles , Qiunan Xu , Claudia Felser , Yan Sun This is my paper · ORCID
classification cond-mat.str-elcond-mat.mtrl-sci
keywords magneticstatesqaheanomaloushallwsmsbulkchern
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abstract

The quantum anomalous Hall effect (QAHE) and magnetic Weyl semimetals (WSMs) are topological states induced by intrinsic magnetic moments and spin-orbit coupling. Their similarity suggests the possibility of achieving the QAHE by dimensional confinement of a magnetic WSM along one direction. In this study, we investigate the emergence of the QAHE in the two-dimensional (2D) limit of magnetic WSMs due to finite size effects in thin films and step-edges. We demonstrate the feasibility of this approach with effective models and real materials. To this end, we have chosen the layered magnetic WSM Co$_3$Sn$_2$S$_2$, which features a large anomalous Hall conductivity and anomalous Hall angle in its 3D bulk, as our material candidate. In the 2D limit of Co$_3$Sn$_2$S$_2$ two QAHE states exist depending on the stoichiometry of the 2D layer. One is a semimetal with a Chern number of 6, and the other is an insulator with a Chern number of 3. The latter has a band gap of 0.05 eV, which is much larger than that in magnetically doped topological insulators. Our findings naturally explain the existence of chiral states in step edges of bulk Co$_3$Sn$_2$S$_2$ which habe been reported in a recent experiment at $T = 4K$ and present a realistic avenue to realize QAH states in thin films of magnetic WSMs.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Temperature-induced band shift in ferromagnetic Weyl semimetal Co3Sn2S2

    cond-mat.supr-con 2019-08 conditional novelty 6.0 of 10

    Temperature-dependent optical conductivity of Co3Sn2S2 tracks magnetization-driven band shifts, with a fitted 1.33 energy renormalization factor, supporting the magnetic Weyl semimetal scenario.

  2. Robust magnetotransport in disordered ferromagnetic kagome layers with quantum anomalous Hall effect

    cond-mat.mes-hall 2019-08 conditional novelty 6.0 of 10

    In a kagome lattice model with the quantum anomalous Hall effect, domain walls create a magnetoresistance of roughly 100% to 200% that is robust against disorder and domain-wall thickness.

  3. Signatures for half-metallicity and nontrivial surface states in a Kagome-lattice magnetic Weyl semimetal Co$_3$Sn$_2$S$_2$

    cond-mat.mtrl-sci 2019-08 conditional novelty 4.0 of 10

    A scanning tunneling microscopy study of Co3Sn2S2 confirms a ~300 meV minority-spin gap and reports standing waves near step edges that the authors interpret as signatures of nontrivial surface states around 50 meV.

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