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Light-Driven Extremely Nonlinear Bulk Photogalvanic Currents.

Ofer Neufeld1, Nicolas Tancogne-Dejean1, Umberto De Giovannini1,2,3

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|October 1, 2021
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Summary
This summary is machine-generated.

We predict controllable bulk photocurrents using corotating circularly polarized light. This mechanism works in various materials, offering efficient light-driven electronics and sub-band-gap photogalvanic effects without complex laser stabilization.

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Area of Science:

  • Condensed matter physics
  • Nonlinear optics
  • Materials science

Background:

  • Bulk photocurrents are crucial for optoelectronic devices.
  • Existing methods often require complex laser setups and specific material properties.

Purpose of the Study:

  • To predict a universal mechanism for generating bulk photocurrents using bichromatic fields.
  • To demonstrate controllable photocurrents in diverse materials and dimensions.
  • To explore the underlying physics and potential applications.

Main Methods:

  • Ab initio calculations
  • Theoretical prediction of photocurrent generation
  • Analysis of nonlinear response and symmetry properties

Main Results:

  • Generation of bulk photocurrents in gapped materials, semimetals, and 2D/3D systems using corotating circularly polarized bichromatic fields.
  • Controllable photocurrent directionality and amplitude without carrier-envelope-phase stabilization or few-cycle pulses.
  • Photocurrents are transverse to laser axis, originating from generalized time-reversal symmetry, and can exhibit phase sensitivity at high laser powers.

Conclusions:

  • A universal mechanism for generating bulk photocurrents is established, applicable across various materials and dimensions.
  • The method offers efficient light-driven control of electronics and enhances sub-band-gap photogalvanic effects.
  • Potential for novel optoelectronic devices leveraging controllable photocurrents.