Illustration from Scientific Research

The photogalvanic process relies upon two-photon transitions (780 nm) and three-photon transitions (one 780 nm photon and two 1,560 nm photons) that occur simultaneously in Si 3 N 4 . Quantum interference 34 of these two processes breaks the symmetry and creates a field that induces drifting by the conduction electrons generated by the absorption process.

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