Klein tunneling through an asymmetric barrier: Symmetric transmission and directional pair creation

Abstract:We prove that the transmission probability for the Klein tunneling through a spatially asymmetric barrier is the same for left and right incidence whenever each asymptotic lead carries a single propagating channel per direction. Time-dependent Wigner-function simulations confirm this and locate the missing directionality in the barrier's interior, where a sharp edge generates several times more under-barrier negative-energy population than a smooth one. Directional control in the Klein regime therefore resides in pair production rather than in the transmitted current.

arXiv:2607.22337 [quant-ph]

(or arXiv:2607.22337v1 [quant-ph] for this version)

https://doi.org/10.48550/arXiv.2607.22337 Focus to learn more arXiv-issued DOI via DataCite (pending registration)

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