Disorder-induced instability of a Weyl nodal loop semimetal towards a diffusive topological metal with protected multifractal surface states
arxiv(2024)
摘要
Weyl nodal loop semimetals are gapless topological phases that, unlike their
insulator counterparts, may be unstable to small perturbations that respect
their topology-protecting symmetries. Here, we analyze a clean system perturbed
by chiral off-diagonal disorder using numerically exact methods. We establish
that the ballistic semimetallic phase is unstable towards the formation of an
unconventional topological diffusive metal hosting topological multifractal
surface states. Although, as in the clean case, surface states are
exponentially localized along the direction perpendicular to the nodal loop,
disorder induces a multifractal structure in the remaining directions.
Surprisingly, the number of these states also increases with a small amount of
disorder. Eventually, as disorder is further increased, the number of surface
states starts decreasing. In the strong disordered regime we predict that some
types of disorder induce an Anderson transition into an electrically-polarized
insulator whose signature may be detected experimentally.
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