Intrinsic Charge Carrier Mobility in Single-Layer Black Phosphorus

We present a theory for single- and two-phonon charge carrier scattering in anisotropic two-dimensional semiconductors applied to single-layer black phosphorus (BP). We show that in contrast to graphene, where two-phonon processes due to the scattering by flexural phonons dominate at any practically relevant temperatures and are independent of the carrier concentration $n$, two-phonon scattering in BP is less important and can be considered negligible at $n\gtrsim {10}^{13}$ cm${}^{-2}$. At smaller $n$, however, phonons enter in the essentially anharmonic regime. Compared to the hole mobility, which does not exhibit strong anisotropy between the principal directions of BP (${\mu }_{xx}\mathrm{/}{\mu }_{yy}\sim 1.4$ at $n={10}^{13}$ cm${}^{-2}$ and $T=300$ K), the electron mobility is found to be significantly more anisotropic (${\mu }_{xx}\mathrm{/}{\mu }_{yy}\sim 6.2$). Absolute values of ${\mu }_{xx}$ do not exceed 250 (700) cm${}^2$V${}^{-1}$s${}^{-1}$ for holes (electrons), which can be considered as an upper limit for the mobility in BP at room temperature.