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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Simulations show stronger self-focusing and sharper plasma boundaries for wavelengths below the Rb D2 resonance than above it, attributed to anomalous dispersion, excited-state transitions, and multiphoton ionization rates.
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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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Wavelength dependence of laser pulse filamentation in the close spectral vicinity of atomic resonances
Simulations show stronger self-focusing and sharper plasma boundaries for wavelengths below the Rb D2 resonance than above it, attributed to anomalous dispersion, excited-state transitions, and multiphoton ionization rates.