Speaker
Carsten Timm
(Technical University of Dresden)
Description
Trigonal PtBi2 is a noncentrosymmetric Weyl semimetal with topologically protected surface bands forming six Fermi arcs at each (001) surface. Recent angular resolved photoemission (ARPES) experiments suggesting the presence of unconventional, nodal superconductivity in these Fermi arcs with a critical temperature of about 10 K [1] have created quite a bit of excitement. After reviewing the experimental evidence, I will argue that the nodal superconducting state has angular momentum 6 (i-wave). The six point nodes at one surface are characterized by the same winding number and are predicted to be associated with topological hinge states.
[1] S. Changdar et al., Topological nodal i-wave superconductivity in PtBi2 Nature 647, 613 (2025).