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high-harmonic generation 1nonequilibrium steady state 1quantum transport 1Su-Schrieffer-Heeger model 1symmetry breaking 1

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quant-ph2026

Even-harmonic generation through nonequilibrium steady-state symmetry breaking

Milad Jangjan, Arman Kashef, Siamak Pooyan +2

The paper shows that even-order high‑harmonic generation can appear in an inversion‑symmetric SSH chain when a nonequilibrium steady‑state current breaks the symmetry, linking tran…