S. Thirupathaiah, Y. S. Kushnirenk, K. Koepernik, B. R. Piening, B. Buechner, S. Aswartham, J. van den Brink, S. V. Borisenko, I. C. Fulga
SciPost Phys. 10, 004 (2021) ·
published 11 January 2021
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,  direction. Our results mark cubic PtBi2, as an ideal
candidate to study the transport properties of gapless topological systems
beyond Dirac and Weyl semimetals.