Electrically tunable surface-to-bulk coherent coupling in topological insulator thin films
We study coherent electronic transport in charge-density-tunable microdevices patterned from thin films of the topological insulator (TI) Bi[subscript 2]Se[subscript 3]. The devices exhibit pronounced electric field effect, including ambipolar modulation of the resistance with an on-and-off ratio of...
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American Physical Society (APS)
2012
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| Online Access: | http://hdl.handle.net/1721.1/69602 https://orcid.org/0000-0002-2480-1211 https://orcid.org/0000-0003-3648-7706 https://orcid.org/0000-0001-8217-8213 |
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| author | Steinberg, Hadar Laloe, Jean-Baptiste Fatemi, Valla Moodera, Jagadeesh Jarillo-Herrero, Pablo |
| author2 | MIT Materials Research Laboratory |
| author_facet | MIT Materials Research Laboratory Steinberg, Hadar Laloe, Jean-Baptiste Fatemi, Valla Moodera, Jagadeesh Jarillo-Herrero, Pablo |
| author_sort | Steinberg, Hadar |
| collection | MIT |
| description | We study coherent electronic transport in charge-density-tunable microdevices patterned from thin films of the topological insulator (TI) Bi[subscript 2]Se[subscript 3]. The devices exhibit pronounced electric field effect, including ambipolar modulation of the resistance with an on-and-off ratio of 500%. We show that the weak antilocalization correction to conductance is sensitive to the number of coherently coupled channels, which in a TI includes the top and bottom surfaces and the bulk carriers. These are separated into coherently independent channels by the application of gate voltage and at elevated temperatures. Our results are consistent with a model where channel separation is determined by a competition between the phase coherence time and the surface-to-bulk scattering time. |
| first_indexed | 2024-09-23T13:34:29Z |
| format | Article |
| id | mit-1721.1/69602 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:34:29Z |
| publishDate | 2012 |
| publisher | American Physical Society (APS) |
| record_format | dspace |
| spelling | mit-1721.1/696022022-09-28T14:44:08Z Electrically tunable surface-to-bulk coherent coupling in topological insulator thin films Steinberg, Hadar Laloe, Jean-Baptiste Fatemi, Valla Moodera, Jagadeesh Jarillo-Herrero, Pablo MIT Materials Research Laboratory Massachusetts Institute of Technology. Department of Physics Francis Bitter Magnet Laboratory (Massachusetts Institute of Technology) Jarillo-Herrero, Pablo Steinberg, Hadar Laloe, Jean-Baptiste Fatemi, Valla Moodera, Jagadeesh Jarillo-Herrero, Pablo We study coherent electronic transport in charge-density-tunable microdevices patterned from thin films of the topological insulator (TI) Bi[subscript 2]Se[subscript 3]. The devices exhibit pronounced electric field effect, including ambipolar modulation of the resistance with an on-and-off ratio of 500%. We show that the weak antilocalization correction to conductance is sensitive to the number of coherently coupled channels, which in a TI includes the top and bottom surfaces and the bulk carriers. These are separated into coherently independent channels by the application of gate voltage and at elevated temperatures. Our results are consistent with a model where channel separation is determined by a competition between the phase coherence time and the surface-to-bulk scattering time. Israel. Ministry of Science National Science Foundation (U.S.). Division of Materials Research (Grant No. 0504158) United States. Office of Naval Research (Grant No. N00014-09-1-0177) David & Lucile Packard Foundation (Packard Fellowship) 2012-03-08T18:56:17Z 2012-03-08T18:56:17Z 2011-12 2011-10 Article http://purl.org/eprint/type/JournalArticle 1098-0121 1550-235X http://hdl.handle.net/1721.1/69602 Steinberg, H. et al. “Electrically Tunable Surface-to-bulk Coherent Coupling in Topological Insulator Thin Films.” Physical Review B 84.23 (2011): n. pag. Web. 8 Mar. 2012. © 2011 American Physical Society https://orcid.org/0000-0002-2480-1211 https://orcid.org/0000-0003-3648-7706 https://orcid.org/0000-0001-8217-8213 en_US http://dx.doi.org/10.1103/PhysRevB.84.233101 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) APS |
| spellingShingle | Steinberg, Hadar Laloe, Jean-Baptiste Fatemi, Valla Moodera, Jagadeesh Jarillo-Herrero, Pablo Electrically tunable surface-to-bulk coherent coupling in topological insulator thin films |
| title | Electrically tunable surface-to-bulk coherent coupling in topological insulator thin films |
| title_full | Electrically tunable surface-to-bulk coherent coupling in topological insulator thin films |
| title_fullStr | Electrically tunable surface-to-bulk coherent coupling in topological insulator thin films |
| title_full_unstemmed | Electrically tunable surface-to-bulk coherent coupling in topological insulator thin films |
| title_short | Electrically tunable surface-to-bulk coherent coupling in topological insulator thin films |
| title_sort | electrically tunable surface to bulk coherent coupling in topological insulator thin films |
| url | http://hdl.handle.net/1721.1/69602 https://orcid.org/0000-0002-2480-1211 https://orcid.org/0000-0003-3648-7706 https://orcid.org/0000-0001-8217-8213 |
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