Pb chains on reconstructed Si(335) surface

Zdyb

et al. 2017

Sci Rep

Self Cite

We report on a giant Rashba type splitting of metallic bands observed in one-dimensional structures prepared on a vicinal silicon substrate. A single layer of Pb on Si(553) orders this vicinal surface making perfectly regular distribution of monatomic steps. Although there is only one layer of Pb, the system reveals very strong metallic and purely one-dimensional character, which manifests itself in multiple surface state bands crossing the Fermi level in the direction parallel to the step edges and a small band gap in the perpendicular direction. As shown by spin-polarized photoemission and density functional theory calculations these surface state bands are spin-polarized and completely decoupled from the rest of the system. The experimentally observed spin splitting of 0.6 eV at room temperature is the largest found to now in the silicon-based metallic nanostructures, which makes the considered system a promising candidate for application in spintronic devices.

Section: Resultssupporting

confidence: 69%

Purely one-dimensional bands with a giant spin-orbit splitting: Pb nanoribbons on Si(553) surface

Kopciuszyński

Zdyb

et al. 2017

Sci Rep

Self Cite

“…Lead seems to be a natural metal candidate for forming a honeycomb Si structure, since is known not to dissolve in Si nor react with it, forming alloys. 28 R13:9 and 4Â4, respectively. All these structures have been deduced from pure geometry considerations by matching Pb and silicene lattice constants.…”

Section: Introductionmentioning

confidence: 98%

Dirac fermions in silicene on Pb(111) surface

Podsiadły-Paszkowska

Phys. Chem. Chem. Phys.

2015

Self Cite

First-principles density functional theory calculations of silicene deposited on a Pb(111) surface are reported. Several possible silicene superstructures, exhibiting different scanning tunnelling microscopy topography images have been found. All the structures feature low binding energy and very small charge transfer, thus interact weakly with the substrate. As a result linear band dispersion around the K points of the Brillouin zone survives and the bands have mainly 3p character of silicene with very little contribution of the 6p states of Pb. The present study suggests that lead can be the best candidate to host silicene among other metal substrates.

“…We have chosen Pb for two reasons: first, to see the differences between the properties of different chemical species (Pb and In) on the Si(553)-Au surface, and, second, to make a comparison with Pb on different vicinal surface, namely on the Si(335)-Au. 24,25 In particular, we focus on the structural and the electronic properties of the Si(553)-Au surface covered with 0.35 ML of Pb, examined by the STM/STS, ARPES, and DFT calculations. Our results show that 0.35 ML of Pb leads to a double Pb chain structure, one located at the step edges with the Pb atoms separated by 2 × a [110] , similarly to that observed in the case of an In chain on the Si(553)-Au surface, 23 and the other one located in the middle of terraces with a [110] periodicity along the chains, similarly to the case of Pb atoms on the Si(335)-Au surface.…”

Section: Introductionmentioning

confidence: 99%

Structural and electronic properties of double Pb chains on the Si(553)-Au surface

Nita

et al. 2011

Phys. Rev. B

We report on the structural and the electronic properties of Pb atomic chains fabricated on the prepatterned well-ordered Si(553)-Au surface. Using scanning tunneling microscopy/spectroscopy (STM/STS) and angleresolved photoemission (ARPES) supplemented by first-principles density functional theory (DFT) calculations, we show that submonolayer coverage of Pb (0.35 ML) leads to a regular array of several nanometers long double Pb chains. The electronic band structure and the simulated STM topography images obtained from the DFT calculations agree well with the ARPES and STM/STS data.