2017/09/30 by Georgy Alymov, Vladimir Vyurkov, V. Vyurkov +4
Materials Science · Physics and Astronomy · #Atomic physics #Auger #Auger effect #Band gap #Condensed matter physics #Dirac (video compression format) #Electron #Graphene #Graphene research and applications #Non-equilibrium thermodynamics #Physics #Quantum and electron transport phenomena #Quantum mechanics #Topological Materials and Phenomena #cond-mat.mes-hall
paper · pdf · doi:10.1103/physrevb.97.205411
published as Phys. Rev. B 97, 205411 (2018)
openalex publication_date 2018/05/08 · arxiv created 2018/05/20 · arxiv updated 2018/05/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The peculiar electron dispersion in Dirac materials makes lowest-order Auger processes prohibited or marginally prohibited by energy and momentum conservation laws. Thus, Auger recombination (AR) in these materials is very sensitive to many-body effects. We incorporate them at the level of the GW approximation into the nonequilibrium Green's functions approach to AR and study the role of dynamic screening, spectrum broadening, and renormalization in the case of weakly pumped undoped graphene. We find that incorrect treatment of many-body effects can lead to an order-of-magnitude error in the recombination rate. We show that the AR time depends weakly (sublinearly) on the background dielectric constant, which limits the possibility to control recombination by the choice of substrate. However, the AR time can be considerably prolonged by placing graphene under a metal gate or by introducing a band gap. With carrier cooling taken into account, our results comply with experiments on photoexcited graphene.