Mass fluctuations and absorption rates in Dirac materials sensors

Abstract

We study the mass fluctuations in gapped Dirac materials by treating the mass-term as both a continuous and discrete random variable. Gapped Dirac materials were proposed to be used as materials for Dark matter sensors. One thus would need to estimate the role of disorder and fluctuations on the interband absorption of dark matter. We find that both continuous and discrete fluctuations across the sample introduce tails (e.g. Lifshitz tails) in the density of states and the interband absorption rate. We estimate the strength of the gap filling and discuss implications of these fluctuations on the performance as sensors for Dark matter detection. The approach used in this work provides a basic framework to model the disorder by any arbitrary mechanism on the interband absorption of Dirac material sensors.

7 pages, 5 figures

References in corpus (7)

• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• Dirac materials
• Detection of sub-MeV Dark Matter with Three-Dimensional Dirac Materials
• Rare region effects dominate weakly disordered 3D Dirac points
• Interplay between topology and disorder in a two-dimensional semi-Dirac material
• Impurity effects and bandgap-closing in massive Dirac systems
• Gaps and tails in graphene and graphane