Helium-Surface Interaction and Electronic Corrugation of Bi2Se3(111)

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  • Adrian Ruckhofer, Graz Univ Technol, Graz University of Technology, Inst Expt Phys
  • ,
  • Anton Tamtoegl, Graz Univ Technol, Graz University of Technology, Inst Expt Phys
  • ,
  • Michael Pusterhofer, Graz Univ Technol, Graz University of Technology, Inst Expt Phys
  • ,
  • Martin Bremholm
  • Wolfgang E. Ernst, Graz Univ Technol, Graz University of Technology, Inst Expt Phys

We present a study of the atom surface interaction potential for the He Bi2Se3(111) system. Using selective adsorption resonances, we are able to obtain the complete experimental band structure of atoms in the corrugated surface potential of the topological insulator Bi2Se3. He atom scattering spectra show several selective adsorption resonance features that are analyzed, starting with the free-atom approximation and a laterally averaged atom surface interaction potential. Based on quantum mechanical calculations of the He surface scattering intensities and resonance processes, we are then considering the three-dimensional atom surface interaction potential, which is further refined to reproduce the experimental data. Following this analysis, the He Bi2Se3(111) interaction potential is best represented by a corrugated Morse potential with a well depth of D = (6.54 +/- 0.05) meV, a stiffness of kappa = (0.58 +/- 0.02) A(-1), and a surface electronic corrugation of (5.8 +/- 0.2)% of the lattice constant. The experimental data may also be used as a challenging benchmark system to analyze the suitability of several van der Waals approaches: the He-Bi2Se3(111) interaction captures the fundamentals of weak adsorption systems where the binding is governed by long-range electronic correlations.

OriginalsprogEngelsk
TidsskriftJournal of Physical Chemistry C
Vol/bind123
Nummer29
Sider (fra-til)17829-17841
Antal sider13
ISSN1932-7447
DOI
StatusUdgivet - jul. 2019

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