Temperature-induced band shift in ferromagnetic Weyl semimetal Co3Sn2S2

Abstract

The discovery of nonmagnetic Weyl semimetals (WSMs) in TaAs compounds has triggered lots of efforts in finding its magnetic counterpart. While the direct observation of the Weyl nodes and Fermi arcs in a magnetic candidate through angle-resolved photoemission spectroscopy is hindered by the complex magnetic domains. The transport features of magnetic WSMs, including negative magnetoresistivity and anomalous Hall conductivity, are not conclusive since these are sensitive to extrinsic factors like defects and disorders in lattice or magnetic ordering. Here, we systematically study the temperature-dependent optical spectra of ferromagnetic Co${}_3$Sn${}_2$S${}_2$ experimentally and simulated by first-principles calculations. The many-body correlation effect due to Co $3d$ electrons leads to the renormalization of bands by a factor about 1.33, which is moderate and the description within density functional theory is suitable. As the temperature drops down, the magnetic phase transition happens and the magnetization drives the band shift through exchange splitting. The optical spectra can well detect these changes, including the transitions sensitive and insensitive to the magnetization, and those from the bands around the Weyl nodes. The results strongly support that Co${}_3$Sn${}_2$S${}_2$ is a magnetic WSM and the Weyl nodes can be tuned by magnetization with temperature change.

5 pages, 3 figures

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• Electronic structure and topology across $T_c$ in magnetic Weyl semimetal Co${}_3$Sn${}_2$S${}_2$
• Magnetic order induced chiral phonons in a ferromagnetic Weyl semimetal
• Protracted Kondo screening and kagome bands in heavy-fermion metal Ce${}_3$Al
• Quantum oscillations, Magnetic breakdown and thermal Hall effect in Co${}_3$Sn${}_2$S${}_2$
• Topological Phase Transition in a Magnetic Weyl Semimetal
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• Temperature dependence of correlated electronic states in archetypal kagome metal CoSn
• Correlation driven near-flat band Stoner excitations in a Kagome magnet
• Light-induced anomalous Hall conductivity in massive 3D Dirac semimetal Co${}_3$Sn${}_2$S${}_2$
• Nodal line resonance generating the giant anomalous Hall effect of Co${}_3$Sn${}_2$S${}_2$
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