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Relevant academic research and scientific papers

Self-assembled growth of epitaxial erbium disilicide nanowires on silicon (001)

By choosing a material that has an appropriate asymmetric lattice mismatch to the host substrate, in this case ErSi2 on Si(001), it is possible to grow one-dimensional epitaxial crystals. ErSi2 nanowires are less than one nanometer high, a few nanometers wide, close to a micron long, crystallographically aligned to 〈110〉Si directions, straight, and atomically regular.

Investigation of the geometric and electronic structures of ErSi (2-x) with the density functional theory and comparison with STM images

Study of ErSi(2-x) surfaces system is submitted at one controversy in reason of the STM images bias voltage dependence. In this article, we have investigated by means of calculations issued of the density functional theory (DFT), atomic surface

Scanning tunneling microscopy imaging of facet surfaces of self-organized nanocrystal using metal-coated carbon nanotube tip

The facet surfaces of a self-organized ErSi2 nanocrystal were observed by the STM with a metal-coated carbon nanotube tip. The 10-nm-scale radius and high aspect ratio of the tip was able to provide detailed images of the facet surfaces. The stereographic STM imaging showed that the nanocrystal had (1 0 5) facets of the tetragonal ErSi2 on all facet surfaces with a 1 × 1 periodicity. Bias-dependent STM images revealed that the facet surface has a bulk-truncated structure consisting of Si dimers and Er atoms. Moreover, scanning tunneling spectroscopy exhibited a difference in density of states between top and facet surfaces.

Fermi contour imaging of the two-dimensional semimetal ErSi2 by Fourier transform STM

Using low-temperature scanning tunnelling microscopy we study the two-dimensional (2D) ErSi2 layer grown on Si(111) 7 X 7 substrates. We report on a high atomic resolution that nicely confirms in direct space the previously determined atomic model structure. But more importantly this semimetallic system provides ideally confined 2D electron and hole gases which, by imaging at low bias voltage and low temperature (77 K), give rise to complex standing wave patterns. Using Fourier transform of such standing wave patterns, the whole Fermi contour appears to be involved and both hole and electron pocket features are evidenced. The consistency of our new results with previous photoemission studies is discussed.

MAGNETIC PROPERTIES OF RARE EARTH DISILICIDES RSi//2.

The magnetic properties of the rare earth disilicides (RSi//2) have been re-investigated. We confirm the occurrence of ferromagnetism in PrSi//2 and antiferromagnetism in GdSi//2, TbSi//2 and HoSi//2. NdSi//2 orders at T//N equals 10 K and ErSi//2 orders