Sixfold fermion near the Fermi level in cubic PtBi2

Abstract

We show that the cubic compound PtBi2, is a topological semimetal hosting a sixfold band touching point in close proximity to the Fermi level. Using angle-resolved photoemission spectroscopy, we map the bandstructure of the system, which is in good agreement with results from density functional theory. Further, by employing a low energy effective Hamiltonian valid close to the crossing point, we study the effect of a magnetic field on the sixfold fermion. The latter splits into a total of twenty Weyl cones for a Zeeman field oriented in the diagonal, [111] direction. Our results mark cubic PtBi2, as an ideal candidate to study the transport properties of gapless topological systems beyond Dirac and Weyl semimetals.

15 pages, 6 figures; this is the final, published version

References in corpus (6)

• Discovery of topological chiral crystals with helicoid arc states
• New classes of chiral topological nodes with non-contractible surface Fermi arcs in CoSi
• Prediction of triple point fermions in simple half-Heusler topological insulators
• Fragility of Fermi arcs in Dirac semimetals
• Fermions and bosons in nonsymmorphic PdSb2 with sixfold degeneracy
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Cited by in corpus (5)

• Symmetry Conserving Maximally Projected Wannier Functions
• Coexistience of phononic six-fold, four-fold and three-fold excitations in ternary antimonide Zr3Ni3Sb4
• Electron-phonon interaction and point contact enhanced superconductivity in trigonal PtBi2
• Chirality flip of Weyl nodes and its manifestation in strained MoTe${}_2$
• Enhanced weak superconductivity in trigonal $\gamma$-PtBi${}_2$