posted on 2020-03-18, 21:29authored byJi-kai Lyu, Wei-xiao Ji, Shu-feng Zhang, Chang-wen Zhang, Pei-ji Wang
The
Dirac cone structure provides massless Fermions, ultrahigh
carrier mobility, and many other novel features that are significant
for massless and dissipationless quantum devices. The anisotropic
Dirac cone has the advantage of anisotropic Fermi velocity and carrier
mobility, which is different from the isotropic Dirac cone. Here we
report two different configurations of B2Se monolayers
with anisotropic Dirac cones. Fully optimized B2Se, as
a rare two-dimensional pure planar pristine honeycomb structure, can maintain
good structural integrity at higher temperatures up to 1000 K in ab
initio molecular dynamics simulation, Young’s modulus and Poisson’s
ratio show high anisotropy, the Fermi velocity of 106m/s
is the same order of magnitude as graphene. Moreover, we analyze the
rationality of the existence of Dirac cones in the structure through
wave functions and symmetry. This work provides novel candidates for
finding direction-dependent, massless, and dissipationless quantum
devices.