Non-equilibrium MD simulations extract temperature-dependent lifetimes for Na frustrated translation on Cu(100), showing additive phononic and electronic damping that disagrees with textbook predictions and is reproduced by a separable harmonic-anharmonic model.
Temperature-Dependent Lifetimes of Low-Frequency Adsorbate Modes from Non-Equilibrium Molecular Dynamics Simulations
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abstract
We present calculations on the damping of a low-frequency adsorbate mode on a metal surface, namely the frustrated translation of Na on Cu(100). For the first time, vibrational lifetimes of excited adlayers are extracted from non-equilibrium molecular dynamics calculations accounting for both the phononic and the electronic dissipation channels. The relative contributions of the two damping mechanisms, which we show to be additive, are found to disagree with textbook predictions. A simple model based on separable harmonic and anharmonic contributions is able to semi-quantitatively reproduce the temperature dependence of the computed lifetimes.
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2019 1verdicts
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Temperature-Dependent Lifetimes of Low-Frequency Adsorbate Modes from Non-Equilibrium Molecular Dynamics Simulations
Non-equilibrium MD simulations extract temperature-dependent lifetimes for Na frustrated translation on Cu(100), showing additive phononic and electronic damping that disagrees with textbook predictions and is reproduced by a separable harmonic-anharmonic model.