Comment on 'New Scaling of Child-Langmuir Law in the Quantum Regime'

摘要

In their Letter on the quantum Child-Langmuir law, Ang et al. [1] include exchange-correlation effects within the Kohn-Sham density functional theory (DFT) [2] and explore numerically the maximum transmitted current (J_(max)) in nanogaps. We show here that the calculations are in error as the exchange-correlation component of the chemical potential has been ignored while fixing the boundary conditions for the Hartree potential.