Competition between disorder and interaction effects in 3D Weyl semimetals

Abstract

We investigate the low-energy scaling behavior of an interacting 3D Weyl semimetal in the presence of disorder. In order to achieve a renormalization group analysis of the theory, we focus on the effects of a short-ranged-correlated disorder potential, checking nevertheless that this choice is not essential to locate the different phases of the Weyl semimetal. We show that there is a line of fixed-points in the renormalization group flow of the interacting theory, corresponding to the disorder-driven transition to a diffusive metal phase. Along that boundary, the critical disorder strength undergoes a strong increase with respect to the noninteracting theory, as a consequence of the unconventional screening of the Coulomb and disorder-induced interactions. A complementary resolution of the Schwinger-Dyson equations allows us to determine the full phase diagram of the system, showing the prevalence of a renormalized semimetallic phase in the regime of intermediate interaction strength, and adjacent to the non-Fermi liquid phase characteristic of the strong interaction regime of 3D Weyl semimetals.

5 pages, 4 figures

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• Anisotropic fixed points in Dirac and Weyl semimetals
• Quantum Criticalities with Infinite Anisotropy in Topological Phase Transitions between Dirac and Weyl Semi-metals
• Interplay between tilt, disorder, and Coulomb interaction in type-I Dirac fermions
• Interplay of disorder and interactions in subcritically tilted and anisotropic three-dimensional Weyl fermions
• Functional renormalization group approach to interacting three-dimensional Weyl semimetals
• Global phase diagram of Coulomb-interacting anisotropic Weyl semimetals with disorder
• Interplay of interactions and disorder at the charge-density wave transition of two-dimensional Dirac semimetals