posted on 2021-12-23, 20:43authored byZijian Wang, Ting Cheng, Zhirong Liu
Among
the rare two-dimensional Dirac materials with novel properties,
the FeB2 monolayer with a planar honeycomb structure was
expected to be a promising candidate for spintronic devices due to
its symmetry. Here, we combined group-theory analysis and first-principles
calculations to investigate the band structure and the intrinsic carrier
mobility of the FeB2 monolayer under acoustic phonon scattering
conditions. The Dirac cones were found to be isotropic with a Fermi
velocity of 3.98 × 105 m/s, being about a half of
that in graphene. The Dirac point is a singular point whose projected
orbital components are dependent on the approaching direction. Based
on the generalized deformation potential theory, the carrier mobility
of the FeB2 monolayer at room temperature was predicted
to be about 5.8 × 104 cm2 V–1 s–1 and was less vulnerable to charge doping in
comparison with graphene.