Disorder effects on triple-point fermions

The stability of three-dimensional relativistic semimetals to disorder has recently attracted great attention, but the effect remains elusive for multifold fermions, that are not present in framework quantum field theory. In this paper, we investigate one type so-called triple-point fermions (TPFs), which have pseudospin-1 degrees freedom and topological charges $\pm2$. Specifically, consider on a minimal, three-band tight-binding model, realizes minimal number two TPFs. numerically-obtained, disorder-averaged density states suggests that, within finite energy window, TPFs robust up critical strength disorder. strong regime, inter-TPF scattering is main mechanism destroying single TPF. Moreover, study effects distribution Fermi arcs surface Berry curvature. We demonstrate arc retains its sharpness at weak disorder, gradually dissolves into metallic bulk stronger clean limit, curvature exhibits bipolar configuration Brillouin zone. With increasing positive negative start merge nearby momenta where penetrate bulk.