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This paper proposes a theoretical framework for achieving Klein tunneling at significantly lower energy thresholds through space-time modulation of electromagnetic potentials. By enabling oblique transitions between opposite-energy continua, the research suggests new pathways for experimental realization using relativistic electron beams and flying-focus fronts. The work advances fundamental understanding in high-energy physics with potential implications for future quantum device architectures.
Access to Klein Tunneling via Space-Time Modulation
arXiv:2510.21154v4 Announce Type: replace Abstract: We show that space-time modulation of electromagnetic potentials enables Klein tunneling far below the static threshold. The derived kinematics reveal oblique transitions that can connect opposite-energy continua without requiring their overlap, yielding a velocity-tunable Klein gap where transmission vanishes within a finite velocity window and reemerges beyond. The associated reduction in energy thresholds -- by up to four orders of magnitude -- suggests the potential for experimental realization using flying-focus fronts and relativistic electron beams.
Abstract:We show that space-time modulation of electromagnetic potentials enables Klein tunneling far below the static threshold. The derived kinematics reveal oblique transitions that can connect opposite-energy continua without requiring their overlap, yielding a velocity-tunable Klein gap where transmission vanishes within a finite velocity window and reemerges beyond. The associated reduction in energy thresholds -- by up to four orders of magnitude -- suggests the potential for experimental realization using flying-focus fronts and relativistic electron beams.
Main text: 13 pages, 3 figures. Supplementary material: 14 pages, 2 figures
arXiv:2510.21154 [quant-ph]
(or arXiv:2510.21154v4 [quant-ph] for this version)
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