Complex semiclassical paths in the Feynman path integral for step potentials can be organized into equivalence classes, and one unsuppressed class provides the instanton mechanism for quantum reflection.
Balian \ and\ author C
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The real-time Feynman path integral for step potentials
Complex semiclassical paths in the Feynman path integral for step potentials can be organized into equivalence classes, and one unsuppressed class provides the instanton mechanism for quantum reflection.