Dirac Cone in two dimensional bilayer graphene by intercalation with V, Nb, and Ta transition metals

TL;DR

This study demonstrates how intercalating transition metals like V, Nb, and Ta into bilayer graphene can induce Dirac cones and tune electronic properties, revealing new ways to control 2D material behaviors.

Contribution

The paper introduces a novel first-principles approach to control the electronic properties of bilayer graphene through transition metal intercalation, achieving Dirac cones and diverse electronic phases.

Findings

BLG intercalated with V exhibits a Dirac cone at the K-point.

Transition metal intercalation influences the Fermi level electron density.

The electronic properties can be tuned from metal to semiconductor by varying TM concentration and spin.

Abstract

Bilayer graphene (BLG) is semiconductor whose band gap and properties can be tuned by various methods such as doping or applying gate voltage. Here, we show how to tune electronic properties of BLG by intercalation of transition metal (TM) atoms between two monolayer graphene (MLG) using a novel dispersion-corrected first-principle density functional theory approach. We intercalated V, Nb, and Ta atoms between two MLG. We found that the symmetry, the spin, and the concentration of TM atoms in BLG-intercalated materials are the important parameters to control and to obtain a Dirac Cone in their band structures. Our study reveals that the BLG intercalated with one Vanadium (V) atom, BLG-1V, has a Dirac Cone at the K-point. In all the cases, the present DFT calculations show that the 2$p_z$ sub-shells of C atoms in graphene and the 3$d_{yz}$ sub-shells of the TM atoms provide the electron density near the Fermi level E$\mathrm{_F}$ which controls the material properties. Thus, we show that out-of-plane atoms can influence in-plane electronic densities in BLG, and enumerate the conditions necessary to control the Dirac point. This study presents a new strategy for controlling the material properties of BLG so that they exhibit various behaviors, including: metal, semi-metal, and semiconductor by varying the concentration and spin arrangement of the TM atoms in BLG while offering insight into the physical properties of 2D BLG-intercalated materials.

Figures

Full text

See pages 1-last of Manuscript_Dirac_PRB_2017_printed.pdf

See pages 1-last of Supplementary_Materials_printed.pdf