Docs: add some docs #4039
Docs: add some docs #4039
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This is indeed an important guideline. By the way, the acceleration of SCF convergence for isolated system (or what many people called "highly inhomogeneous systems") is discussed in details in the following paper:
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.64.121101
The above paper discussed approximations made by Kerker mixing, why it is not good in inhomogeneous system, and what would be a good algorithm for those systems. I believe the algorithm in the above paper is just the 'local-tf' option in QE and I've heard positive comments from a few people of using this option in interface calculations. I'm not able to make a conclusion on whether it's worth delving into or implementing this algorithm but this information might be useful.
Fix #4035