Magnetic-field-induced charge redistribution in disordered graphene double quantum dots
We have studied the transport properties of a large graphene double quantum dot under the influence of a background disorder potential and a magnetic field. At low temperatures, the evolution of the charge-stability diagram as a function of the B field is investigated up to 10 T. Our results indicat...
| 主要な著者: | , , , , , |
|---|---|
| その他の著者: | |
| フォーマット: | 論文 |
| 言語: | English |
| 出版事項: |
American Physical Society
2015
|
| オンライン･アクセス: | http://hdl.handle.net/1721.1/99199 https://orcid.org/0000-0002-0413-399X |
| _version_ | 1826216460000690176 |
|---|---|
| author | Connolly, M. R. Cresti, A. Griffiths, J. P. Jones, G. A. C. Smith, C. G. Chiu, Kuei-Lin |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Connolly, M. R. Cresti, A. Griffiths, J. P. Jones, G. A. C. Smith, C. G. Chiu, Kuei-Lin |
| author_sort | Connolly, M. R. |
| collection | MIT |
| description | We have studied the transport properties of a large graphene double quantum dot under the influence of a background disorder potential and a magnetic field. At low temperatures, the evolution of the charge-stability diagram as a function of the B field is investigated up to 10 T. Our results indicate that the charging energy of the quantum dot is reduced, and hence the effective size of the dot increases at a high magnetic field. We provide an explanation of our results using a tight-binding model, which describes the charge redistribution in a disordered graphene quantum dot via the formation of Landau levels and edge states. Our model suggests that the tunnel barriers separating different electron/hole puddles in a dot become transparent at high B fields, resulting in the charge delocalization and reduced charging energy observed experimentally. |
| first_indexed | 2024-09-23T16:48:02Z |
| format | Article |
| id | mit-1721.1/99199 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T16:48:02Z |
| publishDate | 2015 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/991992022-09-29T21:33:55Z Magnetic-field-induced charge redistribution in disordered graphene double quantum dots Connolly, M. R. Cresti, A. Griffiths, J. P. Jones, G. A. C. Smith, C. G. Chiu, Kuei-Lin Massachusetts Institute of Technology. Department of Physics Chiu, Kuei-Lin We have studied the transport properties of a large graphene double quantum dot under the influence of a background disorder potential and a magnetic field. At low temperatures, the evolution of the charge-stability diagram as a function of the B field is investigated up to 10 T. Our results indicate that the charging energy of the quantum dot is reduced, and hence the effective size of the dot increases at a high magnetic field. We provide an explanation of our results using a tight-binding model, which describes the charge redistribution in a disordered graphene quantum dot via the formation of Landau levels and edge states. Our model suggests that the tunnel barriers separating different electron/hole puddles in a dot become transparent at high B fields, resulting in the charge delocalization and reduced charging energy observed experimentally. European GRAND Project (ICT/FET Contract 215752) Engineering and Physical Sciences Research Council 2015-10-08T12:56:52Z 2015-10-08T12:56:52Z 2015-10 2015-08 2015-10-06T22:00:20Z Article http://purl.org/eprint/type/JournalArticle 1098-0121 1550-235X http://hdl.handle.net/1721.1/99199 Chiu, K. L., M. R. Connolly, A. Cresti, J. P. Griffiths, G. A. C. Jones, and C. G. Smith. "Magnetic-field-induced charge redistribution in disordered graphene double quantum dots." Phys. Rev. B 92, 155408 (October 2015). © 2015 American Physical Society https://orcid.org/0000-0002-0413-399X en http://dx.doi.org/10.1103/PhysRevB.92.155408 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. American Physical Society application/pdf American Physical Society American Physical Society |
| spellingShingle | Connolly, M. R. Cresti, A. Griffiths, J. P. Jones, G. A. C. Smith, C. G. Chiu, Kuei-Lin Magnetic-field-induced charge redistribution in disordered graphene double quantum dots |
| title | Magnetic-field-induced charge redistribution in disordered graphene double quantum dots |
| title_full | Magnetic-field-induced charge redistribution in disordered graphene double quantum dots |
| title_fullStr | Magnetic-field-induced charge redistribution in disordered graphene double quantum dots |
| title_full_unstemmed | Magnetic-field-induced charge redistribution in disordered graphene double quantum dots |
| title_short | Magnetic-field-induced charge redistribution in disordered graphene double quantum dots |
| title_sort | magnetic field induced charge redistribution in disordered graphene double quantum dots |
| url | http://hdl.handle.net/1721.1/99199 https://orcid.org/0000-0002-0413-399X |
| work_keys_str_mv | AT connollymr magneticfieldinducedchargeredistributionindisorderedgraphenedoublequantumdots AT crestia magneticfieldinducedchargeredistributionindisorderedgraphenedoublequantumdots AT griffithsjp magneticfieldinducedchargeredistributionindisorderedgraphenedoublequantumdots AT jonesgac magneticfieldinducedchargeredistributionindisorderedgraphenedoublequantumdots AT smithcg magneticfieldinducedchargeredistributionindisorderedgraphenedoublequantumdots AT chiukueilin magneticfieldinducedchargeredistributionindisorderedgraphenedoublequantumdots |