40 research outputs found
Pairwise Partition Graphs and Strategy-proof Social Choice in the Exogenous Indifference Class Model
Preparation, Characterization and electronic structure of Ti-doped BiSe
We report the preparation of high-quality single crystal of BiSe, a
well-known topological insulator and its Ti-doped compositions using Bridgeman
technique. Prepared single crystals were characterized by x-ray diffraction
(XRD) to check the crystalline structure and energy dispersive analysis of
x-rays for composition analysis. The XRD data of Ti-doped compounds show a
small shift with respect to normal BiSe indicating changes in the
lattice parameters while the structure type remained unchanged; this also
establishes that Ti goes to the intended substitution sites. All the above
analysis establishes successful preparation of these crystals with high quality
using Bridgman technique. We carried out x-ray photo-emission spectroscopy to
study the composition via investigating the core level spectra. BiSe
spectra exhibit sharp and distinct features for the core levels and absence of
impurity features. The core level spectra of the Ti-doped sample exhibit
distinct signal due to Ti core levels. The analysis of the spectral features
reveal signature of plasmon excitation and final state satellites; a signature
of finite electron correlation effect in the electronic structure.Comment: Proceedings of DAE SSPS 201