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| Hauptseite > Publikationsdatenbank > Quasiparticle spectrum and plasmonic excitations in the topological insulator Sb $_{2}$ Te $_{3}$ > print |
| Hauptseite > Publikationsdatenbank > Quasiparticle spectrum and plasmonic excitations in the topological insulator Sb $_{2}$ Te $_{3}$ > print |
| 001 | 202081 | ||
| 005 | 20230426083126.0 | ||
| 024 | 7 | _ | |a 10.1103/PhysRevB.91.245123 |2 doi |
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| 024 | 7 | _ | |a 1098-0121 |2 ISSN |
| 024 | 7 | _ | |a 1550-235X |2 ISSN |
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| 037 | _ | _ | |a FZJ-2015-04370 |
| 041 | _ | _ | |a English |
| 082 | _ | _ | |a 530 |
| 100 | 1 | _ | |a Nechaev, I. A. |0 P:(DE-HGF)0 |b 0 |e Corresponding Author |
| 245 | _ | _ | |a Quasiparticle spectrum and plasmonic excitations in the topological insulator Sb $_{2}$ Te $_{3}$ |
| 260 | _ | _ | |a College Park, Md. |c 2015 |b APS |
| 336 | 7 | _ | |a Journal Article |b journal |m journal |0 PUB:(DE-HGF)16 |s 1435236718_9505 |2 PUB:(DE-HGF) |
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| 520 | _ | _ | |a 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. |
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| 542 | _ | _ | |i 2015-06-11 |2 Crossref |u http://link.aps.org/licenses/aps-default-license |
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