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Standard electronic friction approximations catastrophically break down under nonequilibrium conditions, but capturing memory kernels via Markovian embedding stabilizes molecular dynamics to match exact quantum benchmarks.
Widely used approximations for modeling hot-exciton relaxation in semiconductor nanocrystals can fail, but mapping surface hopping (MASH) offers a more reliable alternative.
Negative electronic friction, often attributed to simple Joule heating, actually stems from significant non-Markovian effects that can destabilize standard Langevin descriptions of molecular dynamics.
