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Quantum-Size Effects in Ultra-Thin Gold Films on Pt(111) Surface.

Yury M Koroteev1,2, Igor V Silkin3, Vyacheslav M Silkin4,5,6

  • 1Institute of Strength Physics and Materials Science, Siberian Branch of Russian Academy of Sciences, 634055 Tomsk, Russia.

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Summary

Density-functional theory calculations reveal new electronic states on platinum and gold surfaces. Gold adlayers on platinum surfaces introduce quantum well states, impacting electronic structure and work function.

Keywords:
adsorbatesquantum well statessurface statesthin metal films

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Area of Science:

  • Materials Science
  • Surface Science
  • Condensed Matter Physics

Background:

  • Understanding the electronic properties of metal surfaces and interfaces is crucial for catalysis and electronics.
  • Platinum (Pt) and Gold (Au) surfaces exhibit unique electronic behaviors due to their d-band structures.

Purpose of the Study:

  • To investigate the atomic and electronic structure of clean Pt(111) and Au(111) surfaces.
  • To analyze the impact of n-monolayer (ML) gold adlayers on Pt(111) (n=1-3) using density-functional theory (DFT).
  • To explore the emergence of new electronic states and their influence on surface properties.

Main Methods:

  • Utilizing density-functional theory (DFT) for electronic structure calculations.
  • Incorporating spin-orbital interaction to accurately model electronic states.
  • Analyzing clean Pt(111) and Au(111) surfaces, as well as nML-Au/Pt(111) systems.

Main Results:

  • Discovery of novel, highly localized electronic states on clean Pt(111) and Au(111) surfaces.
  • Identification of numerous quantum well states in nML-Au/Pt(111) within the Au(111) bulk band continuum.
  • Observation of states analogous to Au(111) surface states at n=2 and 3, and detection of Au/Pd interface states.
  • Calculated work function shows minimal variation with increasing Au layer thickness on Pt(111).

Conclusions:

  • Gold adlayers on Pt(111) significantly alter the electronic landscape by introducing quantum confinement effects.
  • The electronic structure modifications are less pronounced compared to s-p metals, suggesting unique d-band interactions.
  • The findings provide insights into the fundamental electronic properties of bimetallic surfaces relevant for surface science applications.