Realization of Practical Eightfold Fermions and Fourfold van Hove Singularity in TaCo2Te2
Realization of Practical Eightfold Fermions and Fourfold van Hove Singularity in TaCo2Te2
Abstract Space groups describing the symmetry of lattice structure allow the emergence of fermionic quasiparticles with various degeneracy in the band structure. Theoretical efforts have predicted many materials hosting fermions with the highest degeneracy, i.e., eightfold fermions, yet lacking experimental realization. Here, we explore the band degeneracies in TaCo2Te2 crystals. …