Multifractality at non-Anderson disorder-driven transitions in Weyl semimetals and other systems

Abstract

Systems with the power-law quasiparticle dispersion ${\epsilon }_{\mathbf{k}}\propto k^{\alpha }$ exhibit non-Anderson disorder-driven transitions in dimensions $d>2\alpha$, as exemplified by Weyl semimetals, 1D and 2D arrays of ultracold ions with long-range interactions, quantum kicked rotors and semiconductor models in high dimensions. We study the wavefunction structure in such systems and demonstrate that at these transitions they exhibit fractal behaviour with an infinite set of multifractal exponents. The multifractality persists even when the wavefunction localisation is forbidden by symmetry or topology and occurs as a result of elastic scattering between all momentum states in the band on length scales shorter than the mean free path. We calculate explicitly the multifractal spectra in semiconductors and Weyl semimetals using one-loop and two-loop renormalisation-group approaches slightly above the marginal dimension $d=2\alpha$.

10 pages, 5 figures, 3 tables

References in corpus (6)

• Anderson Transitions
• Rare region effects dominate weakly disordered 3D Dirac points
• Disorder effect on 3-dimensional $Z_2$ quantum spin Hall systems
• Unconventional localisation transition in high dimensions
• Ballistic transport in disordered graphene
• Dimensional dependence of the metal-insulator transition

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