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Surface dynamics on submonolayer Pb/Cu(001) surfaces.

S D Borisova1, S V Eremeev1, G G Rusina1

  • 1Institute of Strength Physics and Materials Science, 634055, Tomsk, Russia. eremeev@ispms.tsc.ru.

Physical Chemistry Chemical Physics : PCCP
|February 15, 2022
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Summary
This summary is machine-generated.

The study reveals that increasing lead (Pb) coverage on copper (Cu)(001) enhances structural stability and alters surface vibrations. This impacts the dynamic behavior of two-dimensional lead phases on the copper surface.

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Area of Science:

  • Surface Science and Materials Science
  • Computational Condensed Matter Physics

Background:

  • Understanding the atomic structure and dynamics of adsorbed layers is crucial for surface science.
  • The behavior of submonolayer Pb on Cu(001) is complex, involving various two-dimensional phases.
  • Phonon spectra provide insights into the dynamic stability and vibrational properties of surfaces.

Purpose of the Study:

  • To investigate the interplay between atomic structure and phonon spectra of Pb phases on Cu(001).
  • To determine how Pb coverage influences the dynamic stability and vibrational modes of the Pb/Cu(001) system.
  • To explore the formation of new adsorbate-substrate vibration modes with increasing coverage.

Main Methods:

  • Embedded Atom Method (EAM) interatomic potentials for calculating atomic structure and phonon spectra.
  • Density Functional Theory (DFT) for complementary calculations of equilibrium atomic structures.
  • Analysis of phonon modes, including the Rayleigh mode of the copper surface.

Main Results:

  • Dynamic stability of Pb/Cu(001) structures increases with coverage, from 0.375 ML to 0.6 ML.
  • A dense Pb layer formed at 0.6 ML exhibits enhanced dynamic stability.
  • Increasing Pb coverage shifts the copper surface's Rayleigh mode to higher energy.
  • New mixed adsorbate-substrate vibration modes appear with increasing coverage.

Conclusions:

  • Coverage-dependent structural and dynamic properties are significant for Pb/Cu(001) systems.
  • The formation of dense Pb layers leads to increased dynamic stability.
  • Adsorbate-substrate interactions modify surface phonon behavior, creating new vibrational modes.