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Subcycle dynamics of excitons under strong laser fields.

Eduardo B Molinero1, Bruno Amorim2, Mikhail Malakhov3

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Excitons are surprisingly stable in two-dimensional (2D) materials under intense laser fields, significantly impacting nonlinear optical responses. This study reveals their crucial role and stability, offering new insights into 2D material optics.

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Area of Science:

  • Solid-state physics
  • Quantum optics
  • Materials science

Background:

  • Excitons are fundamental to the linear optical response of 2D materials.
  • Their role in nonlinear optical phenomena under intense fields is often underestimated.
  • Strong laser fields are typically expected to dissociate electron-hole pairs.

Purpose of the Study:

  • To theoretically investigate the formation and role of excitons in the nonlinear optical response of 2D materials.
  • To determine the stability of excitons under intense, nonresonant, low-frequency light.
  • To explore methods for isolating and controlling excitonic contributions.

Main Methods:

  • Theoretical modeling of high-harmonic generation (HHG) in 2D materials.
  • Spectroscopic analysis using HHG as a probe.
  • Comparison with driven Rydberg states in atomic systems.

Main Results:

  • Excitons exhibit a prominent contribution to the nonlinear optical response.
  • Excitons remain stable even when the driving laser field exceeds the Coulomb binding field strength.
  • A strong analogy is drawn between laser-driven excitons in 2D solids and driven Rydberg states in atoms.
  • Encapsulation in a dielectric medium allows tuning of excitonic energy and its HHG contribution.

Conclusions:

  • Excitons play a vital, stable role in the nonlinear optical response of 2D materials, contrary to expectations.
  • The behavior of driven excitons mirrors that of driven Rydberg states, providing a unified understanding.
  • Dielectric engineering offers a pathway to control excitonic effects in nonlinear optics of 2D materials.