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This study reveals how structured environments influence vibrational relaxation dynamics. A small number of explicit bath modes effectively capture short-time non-Markovian effects in vibrating systems.

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Area of Science:

  • Quantum dynamics
  • Condensed matter physics
  • Chemical physics

Background:

  • Understanding vibrational relaxation is crucial for molecular systems.
  • Non-Markovian dynamics describe systems with memory effects.
  • Structured environments significantly impact relaxation processes.

Purpose of the Study:

  • To investigate non-Markovian relaxation dynamics of vibrating systems in structured environments.
  • To analyze the role of explicit and implicit bath modes in system-bath interactions.
  • To explore computational methods for simulating these dynamics.

Main Methods:

  • Stochastic multiconfiguration time-dependent Hartree (SMCTDH) method for numerical simulations.
  • Partitioning system-bath interaction into explicit and implicit contributions.
  • Analysis of vibrational relaxation dynamics of an adsorbate coupled to phonons.

Main Results:

  • A small number of explicit bath modes are sufficient to capture short-time non-Markovian dynamics.
  • Non-Markovian effects are prominent due to the partitioning of system-bath interactions.
  • Imposing a Markovian closure on the explicit bath reveals distinct physical regimes.

Conclusions:

  • The study provides insights into the non-Markovian vibrational relaxation in complex systems.
  • The findings highlight the importance of considering structured environments.
  • The employed method offers a pathway to study diverse relaxation dynamics.