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Area of Science:

  • Condensed Matter Physics
  • Topological Materials
  • Quantum Optics

Background:

  • The circular photogalvanic effect (CPGE) is observed in materials lacking inversion symmetry.
  • CPGE is typically dependent on specific material properties.
  • Previous studies have not established a quantized CPGE.

Purpose of the Study:

  • To investigate the CPGE in Weyl semimetals and 3D Rashba materials.
  • To determine if the CPGE can be quantized and independent of material specifics.
  • To explore the potential for direct detection of topological charges.

Main Methods:

  • Theoretical analysis of photocurrents in materials without inversion and mirror symmetries.
  • Investigating Weyl semimetals (e.g., SrSi2) and 3D Rashba materials (e.g., doped Te).
  • Analyzing the injection contribution to CPGE and its relation to fundamental constants.

Main Results:

  • The injection contribution to CPGE in these materials is effectively quantized.
  • Quantization is in terms of fundamental constants (e, h, c) and independent of material parameters.
  • The CPGE directly measures the topological charge of Weyl points.

Conclusions:

  • CPGE in specific Weyl semimetals and 3D Rashba materials exhibits quantization.
  • This quantized CPGE provides a direct and material-independent measure of topological charge.
  • The large magnitude of CPGE allows for current-based detection of monopole charges.