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Area of Science:

  • Quantum mechanics
  • Condensed matter physics
  • Materials science

Background:

  • Understanding electron dynamics in atomically thin materials is crucial for next-generation electronics.
  • Electron transmission through crystalline films is governed by complex quantum mechanical interactions.

Purpose of the Study:

  • To investigate the attosecond dynamics of electron transmission through atomically thin crystalline films.
  • To analyze the temporal characteristics of electron wave packet propagation.
  • To explore novel quantum phenomena like negative transit times and Wigner time delay.

Main Methods:

  • Utilizing ab initio scattering theory to model electron propagation.
  • Analyzing the relationship between band structure and wave packet transit time.
  • Investigating scattering resonances and their impact on electron dynamics.

Main Results:

  • Electron transit time saturates in forbidden gaps and oscillates in allowed bands with increasing film thickness.
  • Discovery of hitherto unknown negative electron transit times in graphene, h-BN, and oxygen monolayers due to in-plane scattering.
  • Wigner time delay diverges at scattering resonances, linked to the emergence of secondary diffracted beams.

Conclusions:

  • The study provides insights into manipulating electron wave packet propagation timing without compromising transmitted intensity.
  • Resonance-induced spatial reshaping of the wave packet offers potential for elucidating surface interactions.
  • Findings advance the fundamental understanding of quantum electron transport in low-dimensional materials.