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Quantum coherence in the reflection of above barrier wavepackets.

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This summary is machine-generated.

Quantum above barrier reflection shows distinct temporal behaviors based on wavepacket and barrier width. Coherent dynamics exhibit oscillations in flight times, unlike incoherent dynamics, revealing insights into quantum scattering processes.

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Area of Science:

  • Quantum Mechanics
  • Physical Chemistry
  • Surface Science

Background:

  • Above barrier reflection is a fundamental quantum phenomenon.
  • Understanding the temporal dynamics of quantum scattering is crucial for various fields.

Purpose of the Study:

  • Investigate above barrier reflection using a time-dependent approach.
  • Analyze mean flight times for reflection and transmission over a barrier.
  • Examine the dependence of these times on barrier width and wavepacket characteristics.

Main Methods:

  • Utilized Gaussian wavepackets for time-dependent quantum mechanical simulations.
  • Analyzed transition path time distributions to determine mean flight times.
  • Studied the impact of barrier width and wavepacket-to-barrier width ratio on dynamics.

Main Results:

  • Identified two distinct regimes: coherent (wavepacket width > barrier length) and incoherent (wavepacket width < barrier length).
  • Coherent regime shows oscillatory flight times and differences, linked to resonances and momentum filtering.
  • Incoherent regime lacks oscillations; wavepackets split temporally, with classical Wigner approximation proving quantitative.

Conclusions:

  • Wigner phase time does not accurately capture temporal properties of above barrier reflection.
  • Wavepacket structure differs significantly between coherent and incoherent regimes.
  • Coherence plays a critical role in resonance reactive scattering.