Positron surface state as a spectroscopic probe for characterizing surfaces of topological insulator materials
Topological insulators are attracting considerable interest due to their potential for technological applications and as platforms for exploring wide-ranging fundamental science questions. In order to exploit, fine-tune, control, and manipulate the topological surface states, spectroscopic tools whi...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
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American Physical Society
2018
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| Online Access: | http://hdl.handle.net/1721.1/116632 https://orcid.org/0000-0002-2480-1211 |
| _version_ | 1811070568898756608 |
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| author | Callewaert, Vincent Shastry, K. Saniz, Rolando Makkonen, Ilja Barbiellini, Bernardo Assaf, Badih A. Partoens, Bart Bansil, Arun Weiss, A. H. Heiman, Donald E. Moodera, Jagadeesh |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Callewaert, Vincent Shastry, K. Saniz, Rolando Makkonen, Ilja Barbiellini, Bernardo Assaf, Badih A. Partoens, Bart Bansil, Arun Weiss, A. H. Heiman, Donald E. Moodera, Jagadeesh |
| author_sort | Callewaert, Vincent |
| collection | MIT |
| description | Topological insulators are attracting considerable interest due to their potential for technological applications and as platforms for exploring wide-ranging fundamental science questions. In order to exploit, fine-tune, control, and manipulate the topological surface states, spectroscopic tools which can effectively probe their properties are of key importance. Here, we demonstrate that positrons provide a sensitive probe for topological states and that the associated annihilation spectrum provides a technique for characterizing these states. Firm experimental evidence for the existence of a positron surface state near Bi2Te2Se with a binding energy of Eb=2.7±0.2eV is presented and is confirmed by first-principles calculations. Additionally, the simulations predict a significant signal originating from annihilation with the topological surface states and show the feasibility to detect their spin texture through the use of spin-polarized positron beams. |
| first_indexed | 2024-09-23T08:38:07Z |
| format | Article |
| id | mit-1721.1/116632 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T08:38:07Z |
| publishDate | 2018 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/1166322022-09-30T10:08:55Z Positron surface state as a spectroscopic probe for characterizing surfaces of topological insulator materials Callewaert, Vincent Shastry, K. Saniz, Rolando Makkonen, Ilja Barbiellini, Bernardo Assaf, Badih A. Partoens, Bart Bansil, Arun Weiss, A. H. Heiman, Donald E. Moodera, Jagadeesh Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Plasma Science and Fusion Center Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology) Heiman, Donald E. Moodera, Jagadeesh Topological insulators are attracting considerable interest due to their potential for technological applications and as platforms for exploring wide-ranging fundamental science questions. In order to exploit, fine-tune, control, and manipulate the topological surface states, spectroscopic tools which can effectively probe their properties are of key importance. Here, we demonstrate that positrons provide a sensitive probe for topological states and that the associated annihilation spectrum provides a technique for characterizing these states. Firm experimental evidence for the existence of a positron surface state near Bi2Te2Se with a binding energy of Eb=2.7±0.2eV is presented and is confirmed by first-principles calculations. Additionally, the simulations predict a significant signal originating from annihilation with the topological surface states and show the feasibility to detect their spin texture through the use of spin-polarized positron beams. Academy of Finland (Projects No. 285809) Academy of Finland (Projects No. 293932) United States. Department of Energy. Office of Basic Energy Sciences (Grant No. DE-FG02- 07ER4635) United States. Department of Energy (Grant No. DE-AC02-05CH11231) National Science Foundation (U.S.) (Grants No. DMR-MRI-1338130) National Science Foundation (U.S.) (Grants No. DMR-1508719) National Science Foundation (U.S.) (Grants No. DMR-1231319) National Science Foundation (U.S.) (DMR-1207469) United States. Office of Naval Research (Grant No. N00014-13-1-0301) Laboratoire de physique théorique. École Normale Supérieule. International Centre for Fundamental Physics (Grant No. ANR-10-LABX-0010/ANR- 10-IDEX-0001-02 PSL) 2018-06-26T16:13:54Z 2018-06-26T16:13:54Z 2016-09 2016-08 2018-06-26T12:13:29Z Article http://purl.org/eprint/type/JournalArticle 2469-9950 2469-9969 http://hdl.handle.net/1721.1/116632 Callewaert, Vincent, K. Shastry, Rolando Saniz, Ilja Makkonen, Bernardo Barbiellini, Badih A. Assaf, Donald Heiman, et al. “Positron Surface State as a Spectroscopic Probe for Characterizing Surfaces of Topological Insulator Materials.” Physical Review B 94, no. 11 (September 6, 2016). https://orcid.org/0000-0002-2480-1211 http://dx.doi.org/10.1103/PhysRevB.94.115411 Physical Review B Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society APS |
| spellingShingle | Callewaert, Vincent Shastry, K. Saniz, Rolando Makkonen, Ilja Barbiellini, Bernardo Assaf, Badih A. Partoens, Bart Bansil, Arun Weiss, A. H. Heiman, Donald E. Moodera, Jagadeesh Positron surface state as a spectroscopic probe for characterizing surfaces of topological insulator materials |
| title | Positron surface state as a spectroscopic probe for characterizing surfaces of topological insulator materials |
| title_full | Positron surface state as a spectroscopic probe for characterizing surfaces of topological insulator materials |
| title_fullStr | Positron surface state as a spectroscopic probe for characterizing surfaces of topological insulator materials |
| title_full_unstemmed | Positron surface state as a spectroscopic probe for characterizing surfaces of topological insulator materials |
| title_short | Positron surface state as a spectroscopic probe for characterizing surfaces of topological insulator materials |
| title_sort | positron surface state as a spectroscopic probe for characterizing surfaces of topological insulator materials |
| url | http://hdl.handle.net/1721.1/116632 https://orcid.org/0000-0002-2480-1211 |
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