Terahertz driven extremely nonlinear bulk photogalvanic currents in non-resonant conditions

@article{Neufeld2021TerahertzDE,
  title={Terahertz driven extremely nonlinear bulk photogalvanic currents in non-resonant conditions},
  author={Ofer Neufeld and Nicolas Tancogne-Dejean and Umberto De Giovannini and Hannes Hubener and {\'A}ngel Rubio},
  journal={arXiv: Materials Science},
  year={2021}
}
We report on the generation of bulk photocurrents in materials driven by non-resonant bi-chromatic fields that are circularly polarized and co-rotating. The nonlinear photocurrents have a fully controllable directionality and amplitude without requiring carrier-envelope-phase stabilization or few-cycle pulses, and are generated with photon energies much smaller than the band gap (reducing heating in the photo-conversion process). We demonstrate with ab-initio calculations that the photocurrent… 

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