Vibrational Raman spectroscopy on adsorbate-induced low-dimensional surface structures

Speiser, E.; Esser, N.; Halbig, B.; Geurts, J.; Schmidt, Wolf Gero; Sanna, Simone

doi:10.1016/j.surfrep.2020.100480

Cited by 7 publications

(3 citation statements)

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“…Doubly degenerate phonon modes of E symmetry and non-degenerate A modes preserving the three-fold rotational symmetry are predicted. Their Raman intensity is calculated with the approach described in [ 57 , 58 ]. The modes predicted for the

monolayer structure of (1 × 1) periodicity are compiled in Table 3 .…”

Section: Resultsmentioning

confidence: 99%

Spectroscopic Analysis of Rare-Earth Silicide Structures on the Si(111) Surface

et al. 2021

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Two-dimensional rare-earth silicide layers deposited on silicon substrates have been intensively investigated in the last decade, as they can be exploited both as Ohmic contacts or as photodetectors, depending on the substrate doping. In this study, we characterize rare-earth silicide layers on the Si(111) surface by a spectroscopic analysis. In detail, we combine Raman and reflectance anisotropy spectroscopy (RAS) with first-principles calculations in the framework of the density functional theory. RAS suggests a weakly isotropic surface, and Raman spectroscopy reveals the presence of surface localized phonons. Atomistic calculations allow to assign the detected Raman peaks to phonon modes localized at the silicide layer. The good agreement between the calculations and the measurements provides a strong argument for the employed structural model.

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monolayer structure of (1 × 1) periodicity are compiled in Table 3 .…”

Section: Resultsmentioning

confidence: 99%

Spectroscopic Analysis of Rare-Earth Silicide Structures on the Si(111) Surface

et al. 2021

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“…Raman spectra were recorded in situ in UHV in nearbackscattering geometry (601 between incident and scattered beam, which was normal to the sample surface). 31 A solid-state laser at 660 nm with power of 300 mW was used for Raman excitation. The laser spot on the sample surface was focused to an area of approximately 100 mm 2 .…”

Section: Raman Spectroscopymentioning

confidence: 99%

“…1, measured in parallel and crossed polarization. Polarization selection rules are expressed in the Porto notation 31 (z(yy)-z and z(yx)-z), where x and y are two perpendicular directions in the surface plane, while z is the direction perpendicular to the surface. The measured Raman spectra were modelled by a combination of a cubic function (dashed grey line) for the background and several Voigt functions for the superimposed bands.…”

Section: Vibrational and Electronic Raman Scattering At Mxenesmentioning

confidence: 99%