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Exceptional surface and bulk electronic structures in a topological insulator, Bi2Se3
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Biswas, Deepnarayan, Thakur, Sangeeta, Balakrishnan, Geetha and Maiti, Kalobaran (2015) Exceptional surface and bulk electronic structures in a topological insulator, Bi2Se3. Scientific Reports, 5 . 17351. doi:10.1038/srep17351
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Official URL: http://dx.doi.org/10.1038/srep17351
Abstract
The outstanding problem in topological insulators is the bulk metallicity underneath topologically ordered surface states and the appearance of Dirac point far away from the Fermi energy. Enormous efforts are being devoted to get the Dirac point at the Fermi level via exposure to foreign materials so that these materials can be used in technology and realize novel fundamental physics. Ironically, the conclusion of bulk metallicity in the electronic structure is essentially based on the angle resolved photoemission spectroscopy, a highly surface sensitive technique. Here, we employed state of-the-art hard x-ray photoemission spectroscopy with judiciously chosen experiment geometry to delineate the bulk electronic structure of a topological insulator and a potential thermoelectric material, Bi2Se3. The
results exhibit signature of insulating bulk electronic structure with tiny intensities at ef akin to defect/vacancy induced doped states in the semiconductors. The core level spectra exhibit intense plasmon peak associated to core level excitations manifesting the signature of coupling of electrons to the collective excitations, a possible case of plasmon-phonon coupling. In addition, a new loss feature appear in the core level spectra indicating presence of additional collective excitations in the system.
| Item Type: | Journal Article | ||||||
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| Subjects: | Q Science > QC Physics T Technology > TK Electrical engineering. Electronics Nuclear engineering |
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| Divisions: | Faculty of Science > Physics | ||||||
| Library of Congress Subject Headings (LCSH): | Fermi surfaces , Thermoelectric materials , Photoemission, Semiconductors | ||||||
| Journal or Publication Title: | Scientific Reports | ||||||
| Publisher: | Nature Publishing Group | ||||||
| ISSN: | 2045-2322 | ||||||
| Official Date: | 8 December 2015 | ||||||
| Dates: |
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| Volume: | 5 | ||||||
| Article Number: | 17351 | ||||||
| DOI: | 10.1038/srep17351 | ||||||
| Status: | Peer Reviewed | ||||||
| Publication Status: | Published | ||||||
| Access rights to Published version: | Open Access | ||||||
| Funder: | India. Department of Atomic Energy, Deutsches Elektronen-Synchrotron (Center), Engineering and Physical Sciences Research Council (EPSRC) | ||||||
| Grant number: | EP/L014963/1 (EPSRC) |
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