Despite its powerful capabilities, NEGF comes with several challenges:
1. Computational Complexity: Solving the NEGF equations for large systems can be computationally demanding due to the need to invert large matrices. 2. Parameter Sensitivity: The results can be highly sensitive to the choice of parameters, such as the contact self-energies and the form of the Hamiltonian. 3. Interpretation of Results: The physical interpretation of the Green's functions and self-energies can be complex, requiring a deep understanding of quantum mechanics.
