Evidence for a direct band gap in the topological insulator Bi sub(2) Se sub(3) from theory and experiment
Using angle-resolved photoelectron spectroscopy and ab initio GW calculations, we unambiguously show that the widely investigated three-dimensional topological insulator Bi sub(2) Se sub(3) has a direct band gap at the [Gamma] point. Experimentally, this is shown by a three-dimensional band mapping...
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| Veröffentlicht in: | Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2013-03, Vol.87 (12) |
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| container_title | Physical review. B, Condensed matter and materials physics |
| container_volume | 87 |
| creator | Nechaev, I A Hatch, R C Bianchi, M Guan, D Friedrich, C Aguilera, I Mi, J L Iversen, B B Blugel, S Hofmann, Ph Chulkov, E V |
| description | Using angle-resolved photoelectron spectroscopy and ab initio GW calculations, we unambiguously show that the widely investigated three-dimensional topological insulator Bi sub(2) Se sub(3) has a direct band gap at the [Gamma] point. Experimentally, this is shown by a three-dimensional band mapping in large fractions of the Brillouin zone. Theoretically, we demonstrate that the valence-band maximum is located at the [Gamma] point only if many-body effects are included in the calculation. Otherwise, it is found in a high-symmetry mirror plane away from the zone center. |
| format | Article |
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| ispartof | Physical review. B, Condensed matter and materials physics, 2013-03, Vol.87 (12) |
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| language | eng |
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| source | American Physical Society Journals |
| subjects | Band spectra Band theory Condensed matter Insulators Mathematical analysis Planes Three dimensional Topology |
| title | Evidence for a direct band gap in the topological insulator Bi sub(2) Se sub(3) from theory and experiment |
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