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Tunable Layer Circular Photogalvanic Effect in Twisted Bilayers.

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|March 7, 2020
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This summary is machine-generated.

We developed a theory for the layer circular photogalvanic effect (LCPGE) in chiral bilayers. This effect, induced by circularly polarized light, shows potential for frequency-sensitive light detection.

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Area of Science:

  • Condensed matter physics
  • Optoelectronics

Background:

  • The layer circular photogalvanic effect (LCPGE) describes a polarization-dependent dipole moment in chiral bilayers.
  • Understanding LCPGE is crucial for developing novel photodetectors.

Purpose of the Study:

  • To develop a general theory for LCPGE in quasi-two-dimensional chiral bilayers.
  • To elucidate the geometric origins of LCPGE.
  • To explore LCPGE in twisted bilayer graphene for potential applications.

Main Methods:

  • Developed a general theoretical framework for LCPGE.
  • Analyzed the geometric contributions: interlayer coordinate shift, quantum metric tensor, and Berry curvature.
  • Calculated LCPGE in twisted bilayer graphene.

Main Results:

  • The LCPGE originates from specific interlayer coordinate shifts weighted by quantum geometric properties.
  • Twisted bilayer graphene exhibits a tunable resonance peak for LCPGE.
  • The resonance frequency can be adjusted from visible to infrared by altering the twisting angle.

Conclusions:

  • LCPGE offers a new mechanism for detecting circularly polarized light.
  • The tunability of LCPGE in twisted bilayer graphene is promising for frequency-sensitive infrared detection.