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In recent years, coherent electrons driven by light fields have attractedsignificant interest in exploring novel material phases and functionalities.However, observing coherent light-field-driven electron dynamics in solids ischallenging because the electrons are scattered within several ten femtosecondsin ordinary materials, and the coherence between light and electrons isdisturbed. However, when we use Weyl semimetals, the electron scatteringbecomes relatively long (several hundred femtoseconds - several picoseconds),owing to the suppression of the back-scattering process. This study presentsthe light-field-driven dynamics by the THz pulse to Weyl semimetal Co3Sn2S2,where the intense THz pulse of a monocycle electric field nonlinearly generatesdirect current (DC) via coherent acceleration without scattering andnon-adiabatic excitation (Landau-Zener Transition). In other words, thenon-Ohmic current appears in the Weyl semimetal with a combination of the longrelaxation time and an intense THz pulse. This nonlinear DC generation alsodemonstrates a Keldysh crossover from a photon picture to a light-field pictureby increasing the electric field strength.

Light-field-driven non-Ohmic current and Keldysh crossover in a Weyl semimetal