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Light-induced anomalous Hall effect in graphene.

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This summary is machine-generated.

Researchers observed a light-induced anomalous Hall effect in graphene using ultrafast spectroscopy. This effect reveals a Floquet-engineered topological band structure, with a conductance plateau indicating a significant gap opening.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Optoelectronics

Background:

  • Non-equilibrium phenomena in optically-driven quantum solids are actively researched.
  • Light-induced superconductivity and Floquet-engineered topological phases are key examples.
  • Ultrafast device architectures are crucial for characterizing short-lived effects in electrical transport.

Purpose of the Study:

  • To investigate light-induced phenomena in monolayer graphene.
  • To characterize the electrical transport changes induced by femtosecond laser pulses.
  • To explore the emergence of Floquet-engineered topological band structures.

Main Methods:

  • Utilizing an ultrafast device architecture based on photoconductive switches.
  • Irradiating monolayer graphene with femtosecond pulses of circularly polarized light.
  • Tuning the Fermi level using a gate potential to probe the band structure.

Main Results:

  • Observed a light-induced anomalous Hall effect in monolayer graphene.
  • Demonstrated features reflecting a Floquet-engineered topological band structure.
  • Identified a conductance plateau (approx. 60 meV) at the Dirac point, with a predicted gap of equal magnitude.
  • Measured saturated anomalous Hall conductance of ~1.8±0.4 e²/h within the plateau.

Conclusions:

  • The study provides experimental evidence for light-induced anomalous Hall effect in graphene.
  • The results confirm the presence of a Floquet-engineered topological band structure.
  • The observed phenomena offer insights into controlling quantum properties of materials with light.