Isotropic and energy-selective electron cloaks on graphene
We propose and investigate a design for “electron cloaks” comprised of two electrodes, one top gate and one back gate, on either side of a graphene sheet arranged in a concentric disk configuration. Dirac electrons with specific energies can flow through these electron cloaks with negligible scatter...
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2014
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| Online Access: | http://hdl.handle.net/1721.1/88764 https://orcid.org/0000-0002-0898-0803 https://orcid.org/0000-0002-3968-8530 |
| _version_ | 1826206157217202176 |
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| author | Liao, Bolin Zebarjadi, Mona Esfarjani, Keivan Chen, Gang |
| author2 | Massachusetts Institute of Technology. Department of Mechanical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Mechanical Engineering Liao, Bolin Zebarjadi, Mona Esfarjani, Keivan Chen, Gang |
| author_sort | Liao, Bolin |
| collection | MIT |
| description | We propose and investigate a design for “electron cloaks” comprised of two electrodes, one top gate and one back gate, on either side of a graphene sheet arranged in a concentric disk configuration. Dirac electrons with specific energies can flow through these electron cloaks with negligible scattering, while electrons with different energies experience significant scattering. The scattering widths of the electron cloaks are analyzed using the partial wave formalism applied to the Dirac equation, and the contributions of the first two partial waves to the scattering widths are set to zero simultaneously via a proper combination of the potentials on the two electrodes. We show that this strategy is sufficient for reducing the total scattering widths to below 0.01% of the physical widths of the cloaks. This new design differs from the well-known Klein tunneling phenomenon in that, in our case, the transparency is isotropic and energy selective. These characteristics, in tandem with tunable Fermi levels and/or the gate voltages on the electrodes, enable the electron cloaks to serve as core units in the designs of new sensors, switches, or transistors. |
| first_indexed | 2024-09-23T13:24:40Z |
| format | Article |
| id | mit-1721.1/88764 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:24:40Z |
| publishDate | 2014 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/887642022-09-28T13:58:45Z Isotropic and energy-selective electron cloaks on graphene Liao, Bolin Zebarjadi, Mona Esfarjani, Keivan Chen, Gang Massachusetts Institute of Technology. Department of Mechanical Engineering Liao, Bolin Chen, Gang We propose and investigate a design for “electron cloaks” comprised of two electrodes, one top gate and one back gate, on either side of a graphene sheet arranged in a concentric disk configuration. Dirac electrons with specific energies can flow through these electron cloaks with negligible scattering, while electrons with different energies experience significant scattering. The scattering widths of the electron cloaks are analyzed using the partial wave formalism applied to the Dirac equation, and the contributions of the first two partial waves to the scattering widths are set to zero simultaneously via a proper combination of the potentials on the two electrodes. We show that this strategy is sufficient for reducing the total scattering widths to below 0.01% of the physical widths of the cloaks. This new design differs from the well-known Klein tunneling phenomenon in that, in our case, the transparency is isotropic and energy selective. These characteristics, in tandem with tunable Fermi levels and/or the gate voltages on the electrodes, enable the electron cloaks to serve as core units in the designs of new sensors, switches, or transistors. United States. Dept. of Energy. Office of Basic Energy Sciences (Award DE-FG02-09ER46577) United States. Air Force Office of Scientific Research. Multidisciplinary University Research Initiative 2014-08-18T16:26:04Z 2014-08-18T16:26:04Z 2013-10 2013-10 Article http://purl.org/eprint/type/JournalArticle 1098-0121 1550-235X http://hdl.handle.net/1721.1/88764 Liao, Bolin, Mona Zebarjadi, Keivan Esfarjani, and Gang Chen. “Isotropic and Energy-Selective Electron Cloaks on Graphene.” Phys. Rev. B 88, no. 15 (October 2013). © 2013 American Physical Society https://orcid.org/0000-0002-0898-0803 https://orcid.org/0000-0002-3968-8530 en_US http://dx.doi.org/10.1103/PhysRevB.88.155432 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 American Physical Society |
| spellingShingle | Liao, Bolin Zebarjadi, Mona Esfarjani, Keivan Chen, Gang Isotropic and energy-selective electron cloaks on graphene |
| title | Isotropic and energy-selective electron cloaks on graphene |
| title_full | Isotropic and energy-selective electron cloaks on graphene |
| title_fullStr | Isotropic and energy-selective electron cloaks on graphene |
| title_full_unstemmed | Isotropic and energy-selective electron cloaks on graphene |
| title_short | Isotropic and energy-selective electron cloaks on graphene |
| title_sort | isotropic and energy selective electron cloaks on graphene |
| url | http://hdl.handle.net/1721.1/88764 https://orcid.org/0000-0002-0898-0803 https://orcid.org/0000-0002-3968-8530 |
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