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Adlayer influence on Dirac-type surface state at W(110).

P J Grenz1, D Thonig2,3, M Holtmann1

  • 1Physikalisches Institut, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Straße 10, 48149 Münster, Germany.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|May 4, 2021
PubMed
Summary
This summary is machine-generated.

Iron and cobalt adlayers on tungsten surfaces shift the Dirac-type surface state

Keywords:
ARPESDirac-type surface stateW(110)surface electronic structurethin films

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Area of Science:

  • Surface Science
  • Condensed Matter Physics
  • Materials Science

Background:

  • The W(110) surface exhibits a Dirac-type surface state (DSS) with unique electronic properties.
  • Understanding adlayer effects on surface states is crucial for designing novel electronic materials.

Purpose of the Study:

  • To investigate the influence of iron (Fe) and cobalt (Co) adlayers on the W(110) Dirac-type surface state.
  • To elucidate the mechanisms behind the observed energy shifts in the DSS.

Main Methods:

  • Combined experimental and theoretical approach.
  • Angle-resolved photoelectron spectroscopy (ARPES) for experimental measurements.
  • First-principles calculations for theoretical analysis of surface electronic structure.

Main Results:

  • Fe and Co adlayers induce significant binding energy shifts in the DSS (75 meV for Fe, 107 meV for Co).
  • Adlayer-induced lifting of inward surface relaxation in W(110) contributes to the energy shift.
  • Modification of the surface potential by Fe and Co adlayers causes an additional energy shift.

Conclusions:

  • Fe and Co adlayers significantly modify the electronic properties of the W(110) surface state.
  • Both structural changes (relaxation lifting) and electronic effects (surface potential modification) contribute to the observed energy shifts.
  • This study provides fundamental insights into adlayer-surface interactions and their impact on surface electronic states.