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Floquet optical selection rules in black phosphorus.

Benshu Fan1,2, Umberto De Giovannini2,3, Hannes Hübener2

  • 1State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, People's Republic of China.

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This summary is machine-generated.

We introduce momentum-resolved Floquet optical selection rules to explain ultrafast spectral phenomena in monolayer black phosphorus (BP). These rules, based on symmetry, clarify pump-probe photoemission spectra and reveal new characteristics.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Materials
  • Spectroscopy

Background:

  • Symmetry-endorsed optical selection rules are vital for understanding quantum material optical properties and ultrafast spectral dynamics.
  • Existing frameworks struggle to fully elucidate complex pump-probe photoemission spectra in materials like black phosphorus.

Purpose of the Study:

  • To introduce and apply momentum-resolved Floquet optical selection rules for analyzing pump-probe photoemission spectra in monolayer black phosphorus (BP).
  • To elucidate the influence of material and laser symmetries on spectral distributions.
  • To provide a theoretical framework for understanding light-induced ultrafast phenomena in Floquet systems.

Main Methods:

  • Utilized group theory to develop momentum-resolved Floquet optical selection rules.
  • Employed time-dependent density functional theory (TDDFT) to investigate the dynamical evolution of Floquet(-Volkov) states.
  • Analyzed spectral weight distributions at specific momenta for each sideband in photoemission spectra.

Main Results:

  • Successfully elucidated pump-probe photoemission spectral distributions of monolayer BP using the proposed Floquet optical selection rules.
  • Revealed spectral weights of Floquet(-Volkov) states at specific momenta, comprehensively explained by the new selection rules.
  • Demonstrated the framework's ability to clarify experimental spectra and uncover unexplored characteristics under varying pump-probe configurations.

Conclusions:

  • The developed momentum-resolved Floquet optical selection rules provide a robust explanation for ultrafast spectral phenomena in monolayer BP.
  • This framework deepens the understanding of light-induced ultrafast spectra in BP and offers potential for application to other Floquet systems.
  • The study highlights the critical role of combined material and laser symmetries in dictating optical properties.