  The intrinsic charge transport of stanene is investigated by using density
function theory and density function perturbation theory coupled with Boltzmann
transport equations from first principles. The accurate Wannier interpolations
are applied to calculate the charge carrier scatterings with all branches of
phonons with dispersion contribution. The intrinsic carrier mobilities are
predicted to be 2~3$\times10^3$ cm$^2$/(V s) at 300 K, and we find that the
intervalley scatterings from the out-of-plane and transverse acoustic phonon
modes dominate the carrier relaxation. In contrast, the intrinsic carrier
mobilities obtained by the conventional deformation potential approach (Long et
al., J. Am. Chem. Soc. 2009, 131, 17728) are found to as large as
2~3$\times$10$^6$ cm$^2$/(V s) at 300 K, in which the longitudinal acoustic
phonons are assumed to be the only scattering mechanism. The inadequacy of the
deformation potential approximation in stanene is attributed to the buckling of
the honeycomb structure, which originates from the $sp^2-sp^3$ orbital
hybridization and results in broken mirror symmetry as compared to graphene.
The high carrier mobility of stanene renders it a promising candidate in
nanoelectronics and spintronics applications and we propose to enhance its
carrier mobilities by suppressing the out-of-plane vibrations by substrate
suspension or clamping.
