Topological surface Fermi arcs in the magnetic Weyl semimetal Co3Sn2S2

By Qiunan Xu, Enke Liu, W. Shi, Lukas Muechler, J. Gayles, Claudia Felser, Yan Sun. Physical review B, 2017

161 citations recorded by the source corpus.

Very recently, the half-metallic compound Co3Sn2S2 was proposed to be a magnetic Weyl semimetal (WSM) with Weyl points only 60 meV above the Fermi level E-F. Owing to the low charge carrier density and large Berry curvature induced, Co3Sn2S2 possesses both a large anomalous Hall conductivity and a large anomalous Hall angle, which provide strong evidence for the existence of Weyl points in Co3Sn2S2. In this work, we theoretically study the surface topological feature of Co3Sn2S2 and its counterpart Co3Sn2Se2. By cleaving the sample at the weak Sn-S/Se bonds, one can achieve two different surfaces terminated with Sn and S/Se atoms, respectively. The resulting Fermi-arc-related states can range from the energy of the Weyl points to E-F - 0.1 eV in the Sn-terminated surface. Therefore, it should be possible to observe the Fermi arcs in angle-resolved photoemission spectroscopy (ARPES) measurements. Furthermore, in order to simulate quasiparticle interference in scanning tunneling microscopy (STM) measurements, we also calculate the joint density of states for both terminals. This work should be helpful for a comprehensive understanding of the topological properties of these two magnetic WSMs and further ARPES and STM measurements.

Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/40effb7541e7550faea998c6d5b0bf3ab7dc0c65

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Citations in the corpus

Topological Semimetals from First Principles (2018, background): “More recently, a class of magnetic Co-based magnetic Heusler compounds has been proposed as Weyl semimmetals (81, 82), in addition to the antiferromagnetic Mn3Sn family of materials (83) and layered half-metal Co3Sn2S2 (84).”
Fermi-arc diversity on surface terminations of the magnetic Weyl semimetal Co3Sn2S2 (2019, background): “This is the case for the S terminated surface for which the Fermi-arcs overlap with surface projected bulk bands almost at all energies and momenta away from the Weyl node energy (19).”