Access to Klein Tunneling via Space-Time Modulation

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.