Signatures of Weyl Fermion Annihilation in a Correlated Kagome Magnet

Field-dependent Shubnikov-de Haas oscillations in ferromagnetic Weyl semimetal Co3Sn2S2

“…Our high field fermiology study has allowed the observation of signa-tures of moment-orientation induced modulation of the SOC gap along the nodal line, supporting the theoretical scenario that new Weyl points can be generated and their energy tuned by an in-plane orientation of the magnetic moments [21]. Although Co 3 Sn 2 S 2 is widely viewed as a ferromagnetic Weyl semimetal, our study of the bulk Fermi surfaces of Co 3 Sn 2 S 2 reinforces the central role of the nodal ring in understanding its transport and optical responses, along with its electronic topology [12,13,29,30]. The implications of our quantum oscillation studies in clean samples of Co 3 Sn 2 S 2 can also be applied to a broad class of magnetic TSMs hosting point and line nodes (e.g.…”

Pressure‐Driven Magneto‐Topological Phase Transition in a Magnetic Weyl Semimetal

“…Recently, a TPT around Tc in Co 3 Sn 2 S 2 was revealed in temperaturedependent ARPES studies. [18][19][20] Furthermore, it is indicated that the TPT in Co 3 Sn 2 S 2 can be promoted by both temperature and pressure.…”

“…However, realizing such magnetism-involved TPT is technically challenging and yet to be validated experimentally, because it highlights the essence of intrinsic topological magnets, which are rarely investigated. Recently, TPT around the Curie temperature of Co 3 Sn 2 S 2 is revealed by temperature-dependent angleresolved photoemission spectroscopy (ARPES) studies, [18][19][20] indicating that the transition from Weyl semimetal to TI in Co 3 Sn 2 S 2 can be driven by temperature. Compared with the thermal effect, which destroys the magnetic order at relatively high temperatures, pressure can suppress the magnetism at low temperatures; hence, the intrinsic physical behaviors should be investigated more comprehensively.…”

Intercorrelated anomalous Hall and spin Hall effect in kagome-lattice Co$_3$Sn$_2$S$_2$-based shandite films

“…The conjugated WPs annihilate into doubly-degenerated Dirac points followed by gap opening due to spin-orbit coupling. [Fig.1(f); dashed boxes][21,22] The spinresolved DOS of the two spins channels are equal, as shown in Fig.1(g). σ xy vanishes because contributions from the two spins exactly cancel each other, as expected for a paramagnet.…”

“…The observed evolution of SHC against x and y thus mainly reflects the relative position between E F and a source of spin Berry curvature in momentum space, e.g., a gapped Dirac point. The intercorrelation between the AHE and SHE shown here may constitute a transport signature of Weyl-Dirac topological transition in mWSM and the associated redistribution of the electron's filling [21,22]. 4(c).…”