Density of States of Twisted Bilayer Graphene at Low Energy

Manaf, Muhamad Nasruddin and Santoso, Iman and Hermanto, Arief (2014) Density of States of Twisted Bilayer Graphene at Low Energy. International Conference on Physics (ICP 2014).

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Abstract

We report the calculation of the Density of States (DOS) in Twisted Bilayer Graphene (TBG) system for low energy range near Fermi level using commensurate rotation of 1.16 and 3.48 0 . We obtain a logarithmic behaviour of DOS showing that van Hove Singularities (VHS) are occurred in this system and its position depends on twisted angle. This behaviour coming from the saddle points (SP) of band dispersion of TBG. The position of VHS will move away from Fermi level along with the increase of twisted angle. This result can be used to calculate others physical quantities such as optical conductivity or critical temperature of superconductivity that may occur in TBG.

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