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Published on: August 22, 2017
Very-low-energy electron diffraction from TiS(2): experiment and ab initio theory.
1Institute of Metal Physics, National Academy of Sciences of Ukraine, Kiev, Ukraine. Departamento de Física de Materiales, Facultad de Químicas, Universidad del País Vasco, Apartado 1072, San Sebastián/Donostia, 20080 Basque Country, Spain. Donostia International Physics Center (DIPC), Paseo de Manuel Lardizibal, 4 San Sebastián/Donostia, 20018 Basque Country, Spain.
Summary
This study investigates electron diffraction on 1T TiS(2) surfaces using experimental and theoretical methods. Findings reveal key aspects of unoccupied complex band structure and electron scattering relevant to material properties.
Area of Science:
- Solid State Physics
- Materials Science
- Surface Science
Background:
- 1T TiS(2) is a layered transition metal dichalcogenide with unique electronic properties.
- Understanding electron interactions at surfaces is crucial for electronic device applications.
Purpose of the Study:
- To experimentally and theoretically study very-low-energy electron diffraction from the (0001) surface of 1T TiS(2).
- To interpret the normal incidence electron transmission spectrum using unoccupied complex band structure (CBS).
- To determine the energy dependence of the optical potential and identify features related to inelastic scattering.
Main Methods:
- Experimental measurement of normal incidence electron transmission spectra up to 37 eV above the Fermi level.
- Ab initio calculations using the full-potential extended linear augmented plane wave (FLAPW) method.
- Interpretation of experimental data via unoccupied complex band structure (CBS) analysis.
Main Results:
- Three CBS branches responsible for normal incidence electron transmission were identified.
- The energy dependence of the optical potential V(i) was determined from spectral structures.
- A sharp increase in V(i) at 21.5 eV, linked to a plasmon peak, was observed.
Conclusions:
- The study provides a detailed understanding of electron diffraction on 1T TiS(2) surfaces.
- The results highlight the importance of CBS in interpreting electron transmission spectra.
- The findings contribute to the knowledge of electron-inelastic scattering and plasmon excitations in TiS(2).
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