Impurity effects and bandgap-closing in massive Dirac systems

Abstract

We investigate the effects in the spectral properties of a massive Dirac system of the dynamical renormalization induce by disorder/impurity scattering within the self-consistent Born approximation. We show how that these effects leads to a remarkable closing of the bandgap edge. Above a critical value $U_c$ of the impurity scattering the gap eventually closes, giving rise a finite density of states at zero energy. We show that the bandgap closing stems from the quasi-particle dynamical renormalization and it is not associated with the vanishing of the effective massive term. Incoherent processes are fundamental to describe such physics.

8 pages, 6 figures, Published in PRB

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Cited by in corpus (7)

• Atomistic $T$-matrix theory of disordered 2D materials: Bound states, spectral properties, quasiparticle scattering, and transport
• Disorder-induced phase transition in Dirac systems beyond the linear approximation
• Dominant Role of Two-Photon Vertex in Nonlinear Response of Dirac Materials
• Helical metals and insulators and sheet singularity of inflated Berry monopole
• Disorder-induced topological phase transition in HgCdTe crystals
• Robustness of topological magnons in disordered arrays of skyrmions
• Mass fluctuations and absorption rates in Dirac materials sensors