Space-time modulation of EM potentials enables Klein tunneling far below the static threshold via oblique transitions, producing a velocity-tunable Klein gap with transmission vanishing in a finite velocity window.
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Frequency chirps enhance pair number density by 2-3 orders of magnitude in dynamically assisted fields while reducing sensitivity to polarization.
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Access to Klein Tunneling via Space-Time Modulation
Space-time modulation of EM potentials enables Klein tunneling far below the static threshold via oblique transitions, producing a velocity-tunable Klein gap with transmission vanishing in a finite velocity window.
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Dynamically assisted Schwinger pair production in differently polarized electric fields with the frequency chirping
Frequency chirps enhance pair number density by 2-3 orders of magnitude in dynamically assisted fields while reducing sensitivity to polarization.