Anomalous Transport Signatures in Weyl Semimetals with Point Defects

Abstract

We present the first theoretical study of transport properties of Weyl semimetals with point defects. Focusing on a class of time-reversal symmetric Weyl lattice models, we show that dilute lattice vacancies induce a finite density of quasi-localized states at and near the nodal energy, causing strong modifications to the low-energy spectrum. This generates novel transport effects, namely (i) an oscillatory behaviour of the dc-conductivity with the charge carrier density in the absence of magnetic fields, and (ii) a plateau-shaped dissipative optical response for photon frequencies below the inter-band threshold, $E_F\lesssim \hslash \omega \lesssim 2E_F$.Our results provide a path to engineer unconventional quantum transport effects in Weyl semimetals by means of common point defects.

6 pages + 1 page of Supplementary Material; 4 + 2 Figures. Slight Changes Relative to V1

References in corpus (21)

• Universal Dynamic Conductivity and Quantized Visible Opacity of Suspended Graphene
• The Kernel Polynomial Method
• Topological response in Weyl semimetals and the chiral anomaly
• Modeling disorder in graphene
• Chiral Anomaly and Diffusive Magnetotransport in Weyl Metals
• Chiral anomaly and optical absorption in Weyl semimetals
• Rare region effects dominate weakly disordered 3D Dirac points
• Review of experiments on the chiral anomaly in Dirac-Weyl semimetals
• Friedel oscillations due to Fermi arcs in Weyl semimetals
• Weak antilocalization and localization in disordered and interacting Weyl semimetals
• Magnetotransport of single crystalline NbAs
• Effective field theory of the disordered Weyl semimetal
• Density of states in graphene with vacancies: midgap power law and frozen multifractality
• Rare regions and avoided quantum criticality in disordered Weyl semimetals and superconductors
• Density of states in a two-dimensional chiral metal with vacancies
• Numerical calculation of the Casimir-Polder interaction between a graphene sheet with vacancies and an atom
• Transversal magnetoresistance and Shubnikov-de Haas oscillations in Weyl semimetals
• Breakdown of universality in three-dimensional Dirac semimetals with random impurities
• High-resolution real-space evaluation of the self-energy operator of disordered lattices: Gade singularity, spin-orbit effects and p-wave superconductivity
• Fermi arcs and surface criticality in dirty Dirac materials
• Nodal vacancy bound states and resonances in three-dimensional Weyl semimetals

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