Observation of a topological insulator Dirac cone reshaped by non-magnetic impurity resonance
The massless Dirac electrons found at topological insulator surfaces are thought to be influenced very little by weak, non-magnetic disorder. However, a resonance effect of strongly perturbing non-magnetic impurities has been theoretically predicted to change the dispersion and physical nature of lo...
| Main Authors: | , , , , , , , , , , , , |
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| Format: | Article |
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Springer Nature America, Inc
2019
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| Online Access: | http://hdl.handle.net/1721.1/120945 https://orcid.org/0000-0002-5670-2103 https://orcid.org/0000-0003-0325-5204 |
| _version_ | 1826198915274244096 |
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| author | Miao, Lin Xu, Yishuai Zhang, Wenhan Older, Daniel Breitweiser, S. Alexander Kotta, Erica He, Haowei Denlinger, Jonathan D. Biswas, Rudro R. Wu, Weida Wray, L. Andrew Suzuki, Takehito Checkelsky, Joseph |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Miao, Lin Xu, Yishuai Zhang, Wenhan Older, Daniel Breitweiser, S. Alexander Kotta, Erica He, Haowei Denlinger, Jonathan D. Biswas, Rudro R. Wu, Weida Wray, L. Andrew Suzuki, Takehito Checkelsky, Joseph |
| author_sort | Miao, Lin |
| collection | MIT |
| description | The massless Dirac electrons found at topological insulator surfaces are thought to be influenced very little by weak, non-magnetic disorder. However, a resonance effect of strongly perturbing non-magnetic impurities has been theoretically predicted to change the dispersion and physical nature of low-energy quasiparticles, resulting in unique particle-like states that lack microscopic translational symmetry. Here we report the direct observation of impurities reshaping the surface Dirac cone of the model three-dimensional topological insulator bismuth selenide. A pronounced kink-like dispersion feature is observed in disorder-enriched samples, and found to be closely associated with the anomaly caused by impurity resonance in the surface state density of states, as observed by dichroic angle-resolved photoemission spectroscopy. The experimental observation of these features, which closely resemble theoretical predictions, has significant implications for the properties of topological Dirac cones in applied scenarios that commonly feature point-defect disorder at surfaces or interfaces. Topological insulators - influence of surface impurities: The electronic properties of topological insulators are robust against perturbations, including the presence of non-magnetic impurities. However, surface impurities can give rise to resonant states near the Dirac point, and if their density becomes sufficiently high it is predicted that they can substantially modify the dispersion of the Dirac cone and develop a collective behaviour that results in the formation of particle-like states that lack microscopic translational symmetry. L. Andrew Wray at Purdue University and at the New York University Shanghai, and colleagues, used angle-resolved photoemission spectroscopy to experimentally observe the reshaping of the surface Dirac cone in a defect-rich sample of the topological insulator Bi2Se3. These results indicate that surface impurities can provide a useful handle to control the properties of topological insulators. |
| first_indexed | 2024-09-23T11:11:37Z |
| format | Article |
| id | mit-1721.1/120945 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T11:11:37Z |
| publishDate | 2019 |
| publisher | Springer Nature America, Inc |
| record_format | dspace |
| spelling | mit-1721.1/1209452022-10-01T01:57:47Z Observation of a topological insulator Dirac cone reshaped by non-magnetic impurity resonance Miao, Lin Xu, Yishuai Zhang, Wenhan Older, Daniel Breitweiser, S. Alexander Kotta, Erica He, Haowei Denlinger, Jonathan D. Biswas, Rudro R. Wu, Weida Wray, L. Andrew Suzuki, Takehito Checkelsky, Joseph Massachusetts Institute of Technology. Department of Physics Suzuki, Takehito Checkelsky, Joseph The massless Dirac electrons found at topological insulator surfaces are thought to be influenced very little by weak, non-magnetic disorder. However, a resonance effect of strongly perturbing non-magnetic impurities has been theoretically predicted to change the dispersion and physical nature of low-energy quasiparticles, resulting in unique particle-like states that lack microscopic translational symmetry. Here we report the direct observation of impurities reshaping the surface Dirac cone of the model three-dimensional topological insulator bismuth selenide. A pronounced kink-like dispersion feature is observed in disorder-enriched samples, and found to be closely associated with the anomaly caused by impurity resonance in the surface state density of states, as observed by dichroic angle-resolved photoemission spectroscopy. The experimental observation of these features, which closely resemble theoretical predictions, has significant implications for the properties of topological Dirac cones in applied scenarios that commonly feature point-defect disorder at surfaces or interfaces. Topological insulators - influence of surface impurities: The electronic properties of topological insulators are robust against perturbations, including the presence of non-magnetic impurities. However, surface impurities can give rise to resonant states near the Dirac point, and if their density becomes sufficiently high it is predicted that they can substantially modify the dispersion of the Dirac cone and develop a collective behaviour that results in the formation of particle-like states that lack microscopic translational symmetry. L. Andrew Wray at Purdue University and at the New York University Shanghai, and colleagues, used angle-resolved photoemission spectroscopy to experimentally observe the reshaping of the surface Dirac cone in a defect-rich sample of the topological insulator Bi2Se3. These results indicate that surface impurities can provide a useful handle to control the properties of topological insulators. 2019-03-13T14:03:34Z 2019-03-13T14:03:34Z 2018-06 2018-05 2019-03-12T15:58:13Z Article http://purl.org/eprint/type/JournalArticle 2397-4648 http://hdl.handle.net/1721.1/120945 Miao, Lin et al. “Observation of a Topological Insulator Dirac Cone Reshaped by Non-Magnetic Impurity Resonance.” Npj Quantum Materials 3, 1 (June 2018): 29 © 2018 The Author(s) https://orcid.org/0000-0002-5670-2103 https://orcid.org/0000-0003-0325-5204 http://dx.doi.org/10.1038/S41535-018-0101-8 npj Quantum Materials Creative Commons Attribution 4.0 International license https://creativecommons.org/licenses/by/4.0/ application/pdf Springer Nature America, Inc Nature |
| spellingShingle | Miao, Lin Xu, Yishuai Zhang, Wenhan Older, Daniel Breitweiser, S. Alexander Kotta, Erica He, Haowei Denlinger, Jonathan D. Biswas, Rudro R. Wu, Weida Wray, L. Andrew Suzuki, Takehito Checkelsky, Joseph Observation of a topological insulator Dirac cone reshaped by non-magnetic impurity resonance |
| title | Observation of a topological insulator Dirac cone reshaped by non-magnetic impurity resonance |
| title_full | Observation of a topological insulator Dirac cone reshaped by non-magnetic impurity resonance |
| title_fullStr | Observation of a topological insulator Dirac cone reshaped by non-magnetic impurity resonance |
| title_full_unstemmed | Observation of a topological insulator Dirac cone reshaped by non-magnetic impurity resonance |
| title_short | Observation of a topological insulator Dirac cone reshaped by non-magnetic impurity resonance |
| title_sort | observation of a topological insulator dirac cone reshaped by non magnetic impurity resonance |
| url | http://hdl.handle.net/1721.1/120945 https://orcid.org/0000-0002-5670-2103 https://orcid.org/0000-0003-0325-5204 |
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