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Ultrafast optical currents in gapped graphene.

S Azar Oliaei Motlagh1, Fatemeh Nematollahi, Aranyo Mitra

  • 1Center for Nano-Optics (CeNO) and Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30303, United States of America.

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Summary
This summary is machine-generated.

Strong optical pulses interacting with gapped graphene generate electric currents. This rectified current, flowing perpendicular to the pulse polarization, originates from inter-band transitions, not intra-band.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Optics

Background:

  • Graphene exhibits unique electronic properties due to its 2D structure.
  • Gapped graphene breaks inversion symmetry, leading to distinct optical responses.
  • Ultrashort optical pulses can induce non-equilibrium electronic states.

Purpose of the Study:

  • To theoretically investigate the interaction of ultrashort optical pulses with gapped graphene.
  • To understand the generation and origin of electric currents induced by these pulses.
  • To analyze the role of broken inversion symmetry in the observed phenomena.

Main Methods:

  • Theoretical study of ultrashort optical pulse interaction.
  • Analysis of conduction band population dynamics.
  • Investigation of symmetry properties in gapped graphene.

Main Results:

  • Ultrashort optical pulses create a finite conduction band population and electric current.
  • A linearly polarized pulse along the x-axis generates a rectified current along the y-axis.
  • The conduction band population distribution is symmetric about the x-axis.
  • The rectified current arises from inter-band transitions, with zero intra-band contribution.

Conclusions:

  • Gapped graphene exhibits directional current generation under specific optical pulse conditions.
  • The observed rectified current is a direct consequence of broken inversion symmetry.
  • Understanding these interactions is crucial for optoelectronic applications of gapped graphene.