E. V. Zhizhin

Modification of induced spin-orbit splitting of the π states of graphene during the joint intercalation of Bi and noble metals

The effect of intercalation of Bi atoms and the joint intercalation of atoms of Bi and noble metals (Au, Cu) on the spin and electron structure of graphene formed on Ni(111) is investigated by angle and spin-resolved PES. It is shown that the spin-orbit splitting of π states of graphene of 20–30 meV is observed for the joint intercalation of Bi and Au.

Specific features of the electronic, spin, and atomic structures of a topological insulator Bi2Te2.4Se0.6

The specific features of the electronic and spin structures of a triple topological insulator Bi2Te2.4Se0.6, which is characterized by high-efficiency thermoelectric properties, have been studied with the use of angular- and spin-resolved photoelectron spectroscopy and compared with theoretical calculations in the framework of the density functional theory. It has been shown that the Fermi level for Bi2Te2.4Se0.6 falls outside the band gap and traverses the topological surface state (the Dirac cone). Theoretical calculations of the electronic structure of the surface have demonstrated that the character of distribution of Se atoms on the Te–Se sublattice practically does not influence the dispersion of the surface topological electronic state. The spin structure of this state is characterized by helical spin polarization. Analysis of the Bi2Te2.4Se0.6 surface by scanning tunnel microscopy has revealed atomic smoothness of the surface of a sample cleaved in an ultrahigh vacuum, with a lattice constant of ~4.23 Å. Stability of the Dirac cone of the Bi2Te2.4Se0.6 compound to deposition of a Pt monolayer on the surface is shown.

Spin polarization of quantum-well and interface states of ultrathin films of Bi on w(110) with Ag interlayers

The electronic and spin structure of quantum-well and interface states, formed in the system, consisting of bilayer of Bi on 1 ML Ag/W(110) was investigated by angle- and spin- resolved photoelectron spectroscopy. It has been shown that interface states are formed in local surface-projected gap of W(110) and are characterized by spin polarization and spin-orbit splitting, corresponding to surface resonances with high density spin-polarized states near Fermi edge.

Nickel Adsorption on Bi 2 Se 3 Surface

The effect of the physical adsorption of nickel on a surface of a topological Bi2Se3 insulator on the electronic structure has been studied. The influence of the adsorbate on the chemical bond between Bi and Se atoms has been studied by X-ray photoelectron spectroscopy. It is shown as well that nickel atoms diffuse into the topological insulator volume at room temperature.

Adsorption of silicon atoms on the surface of the Au/W(110)

The possibility of formation of an ordered silicene-like structure on Au/W(110) surface has been considered using angle-resolved photoelectron spectroscopy and X-ray photoelectron spectroscopy. It is shown that the addition of silicon atoms results in a considerable distortion of the electron structure of the initial substrate, and the resulting electron structure cannot be attributed to silicene. The configuration of reflections in the low energy electron diffraction pattern indicates the formation of two-dimensional ordered silicon structures with a large number of multidirectional domains.