Free-electron response in reflectance anisotropy spectra

Fleischer, K.; Chandola, S.; Herrmann, T; Esser, N.; Richter, Wolfgang; McGilp, J. F.

doi:10.1103/physrevb.74.195432

Cited by 25 publications

(43 citation statements)

References 53 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar effects have been previously seen in RAS of photo bleaching in superconductors 32 or in metalinsulator transitions of surface reconstructions. [51][52][53] In a similar way the expected opening of the band gap and consequently reduction in reflection in the infra-red region should lead to an increased reflection elsewhere. Indeed such behaviour was observed in wide spectral range measurements.…”

mentioning

confidence: 80%

Reflectance anisotropy spectroscopy of magnetite (110) surfaces

et al. 2014

Self Cite

View full text Add to dashboard Cite

Reflectance anisotropy spectroscopy (RAS) has been used to measure the optical anisotropies of bulk and thin film Fe3O4(110) surfaces. The spectra indicate that small shifts in energy of the optical transitions, associated with anisotropic strain or electric field gradients caused by the (110) surface termination or an native oxide layer, are responsible for the strong signal observed. The RAS response was then measured as a function of temperature. A distinct change in the RAS line shape amplitude was observed in the spectral range from 0.8 to 1.6 eV for temperatures below the Verwey transition of the crystal. Finally thin film magnetite was grown by molecular beam epitaxy on MgO(110) substrates. Changes in the RAS spectra were found for different film thickness, suggesting that RAS can be used to monitor the growth of magnetite (110) films in situ. The thickness dependence of the RAS is discussed in terms of various models for the origin of the RAS signal.

show abstract

mentioning

confidence: 80%

Reflectance anisotropy spectroscopy of magnetite (110) surfaces

et al. 2014

Self Cite

View full text Add to dashboard Cite

show abstract

“…The RAS measurements indicated that the dominant domain occupied about 80% of the surface. Further experimental details are reported elsewhere [28]. IRSE measurements [29,30] were made under UHV conditions using a photometric ellipsometer attached to a Bruker Vertex 70 series Fourier Transform Interferometer with a spectral resolution of 16 cm À1 .…”

mentioning

confidence: 99%

Structure of Si(111)-In Nanowires Determined from the Midinfrared Optical Response

Chandola

Hinrichs²,

Gensch³

et al. 2009

Phys. Rev. Lett.

Self Cite

View full text Add to dashboard Cite

The anisotropic optical response of Sið111Þ À ð4 Â 1Þ=ð8 Â 2Þ-In in the midinfrared, where ab initio studies predict significant changes in the band structure between competing models of this important quasi-1D system, has been measured using infrared spectroscopic ellipsometry (IRSE) and reflection anisotropy spectroscopy (RAS). Both IRSE and RAS of the (8 Â 2) phase show that the anisotropic Drude tail of the (4 Â 1) phase is replaced by two peaks at 0.50 and 0.72 eV, which appear in ab initio optical response calculations for the hexagon model of the (8 Â 2) structure, but not the trimer model.

show abstract

“…The sharpness of the onset, combined with the downturn below 0.7 eV, suggests that the structure originates from dominant interband transitions aligned along the chains, rather than the intraband transitions that can produce a Drude IR tail in metallic nanostructures [25].…”

Section: Resultsmentioning

confidence: 99%

Using surface and interface optics to probe the capping, with amorphous Si, of Au atom chains grown on vicinal Si(111)

McAlinden

McGilp²

2009

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

The distinct optical signatures of aligned single and double Au atom chain structures, grown on vicinal Si(111) substrates, have been identified using reflectance anisotropy spectroscopy (RAS). Deposition of 0.04 monolayers (ML) of amorphous Si (a-Si) at room temperature perturbs the anisotropic optical response of the double chain structure. By one third of a monolayer, no significant optical anisotropy associated with the chains remains. No anisotropic response re-emerges at higher coverages, up to 4.6 nm (14.5 ML) where there is recent evidence that the crystal structure of the double chain phase is maintained under the cap. The RAS results show that the anisotropic properties of the phase are quenched by a-Si adsorption, even though the crystal structure of the capped phase appears to be preserved.

show abstract

Free-electron response in reflectance anisotropy spectra

Cited by 25 publications

References 53 publications

Reflectance anisotropy spectroscopy of magnetite (110) surfaces

Reflectance anisotropy spectroscopy of magnetite (110) surfaces

Structure of Si(111)-In Nanowires Determined from the Midinfrared Optical Response

Using surface and interface optics to probe the capping, with amorphous Si, of Au atom chains grown on vicinal Si(111)

Contact Info

Product

Resources

About