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Anomalies of a topologically ordered surface
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Biswas, Deepnarayan, Thakur, Sangeeta, Ali, Khadiza, Balakrishnan, Geetha and Maiti, Kalobaran (2015) Anomalies of a topologically ordered surface. Scientific Reports, 5 . 10260. doi:10.1038/srep10260
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Official URL: http://dx.doi.org/10.1038/srep10260
Abstract
Bulk insulators with strong spin orbit coupling exhibit metallic surface states possessing topological order protected by the time reversal symmetry. However, experiments show vulnerability of topological states to aging and impurities. Different studies show contrasting behavior of the Dirac states along with plethora of anomalies, which has become an outstanding problem in material science. Here, we probe the electronic structure of Bi2Se3 employing high resolution photoemission spectroscopy and discover the dependence of the behavior of Dirac particles on surface terminations. The Dirac cone apex appears at different binding energies and exhibits contrasting shift on Bi and Se terminated surfaces with complex time dependence emerging from subtle adsorbed oxygen-surface atom interactions. These results uncover the surface states behavior of real systems and the dichotomy of topological and normal surface states important for device fabrication as well as realization of novel physics such as Majorana Fermions, magnetic monopole, etc.
| 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, Engineering and Medicine > Research Centres > Molecular Organisation and Assembly in Cells (MOAC) | ||||||||
| Library of Congress Subject Headings (LCSH): | Materials science , Surfaces (Physics), Fermions , Magnetic monopoles | ||||||||
| Journal or Publication Title: | Scientific Reports | ||||||||
| Publisher: | Nature Publishing Group | ||||||||
| ISSN: | 2045-2322 | ||||||||
| Official Date: | 4 June 2015 | ||||||||
| Dates: |
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| Volume: | 5 | ||||||||
| Article Number: | 10260 | ||||||||
| DOI: | 10.1038/srep10260 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Open Access | ||||||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC), India. Department of Science and Technology (DST), India. Department of Atomic Energy, Germany. Alexander von Humboldt Foundation | ||||||||
| Grant number: | EP/I007210/1, EPSRC |
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