Isotropic and energy-selective electron cloaks on graphene
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Liao-2013-Isotropic and energy-selective.pdf
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772.86 KB
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Author(s)
Liao, Bolin
Zebarjadi, Mona
Esfarjani, Keivan
Chen, Gang
Date Issued
October 2013
Journal
Physical Review B
Publisher
American Physical Society
Citation
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
Version
Final published version
Abstract
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.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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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.
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.88.155432
