Topological phase transitions in strongly correlated systems: application to Co$_3$Sn$_2$S$_2$
V. Yu. Irkhin,
Yu. N. Skryabin
Abstract:The topological transition in the strongly correlated half-metallic ferromagnetic compound Co 3 Sn 2 S 2 from Weyl semimetal (including chiral massless fermions) to a non-magnetic state is treated. This transition goes with a change in topological invariant, and is accompanied by a non-topological transition from saturated ferromagnetic to paramagnetic state, the minority Fermi surface being transformed from ghost (hidden) to real. A corresponding description is given in terms of slave fermion representation f… Show more
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