TY  - SER
AU  - Nechaev,Ilya A.
AU  - De Renzi,V.
AU  - di Bona,A.
AU  - Lodi Rizzini,A.
AU  - Mio,A.M.
AU  - Nicotra,G.
AU  - Politano,Antonio
AU  - Scalese,S.
AU  - Aliev,Ziya S.
AU  - Aguilera,I.
AU  - Babanly,Mahammad B.
AU  - Blügel,S.
AU  - Friedrich,C.
AU  - Chulkov,Evgueni V.
TI  - Quasiparticle spectrum and plasmonic excitations in the topological insulator Sb2Te3
KW  - квазичастичные спектры
KW  - топологические изоляторы
KW  - статьи в журналах
N1  - Библиогр.: 41 назв
N2  - We report first-principles GW results on the dispersion of the bulk band-gap edges in the three-dimensional topological insulator Sb2Te3. We find that, independently of the reference density-functional-theory band structure and the crystal-lattice parameters used, the one-shot GW corrections enlarge the fundamental band gap, bringing its value in close agreement with experiment. We conclude that the GW corrections cause the displacement of the valence-band maximum (VBM) to the Γ point, ensuring that the surface-state Dirac point lies above the VBM. We extend our study to the analysis of the electron-energy-loss spectrum (EELS) of bulk Sb2Te3. In particular, we perform energy-filtered transmission electron microscopy and reflection EELS measurements. We show that the random-phase approximation with the GW quasiparticle energies and taking into account virtual excitations from the semicore states leads to good agreement with our experimental data
UR  - http://vital.lib.tsu.ru/vital/access/manager/Repository/vtls:000577974
ER  -