Nonlinear response of a ballistic graphene transistor with an ac-driven gate: High harmonic generation and terahertz detection

Y. Korniyenko, O. Shevtsov, and T. Löfwander
Phys. Rev. B 94, 125445 – Published 30 September 2016

Abstract

We present results for time-dependent electron transport in a ballistic graphene field-effect transistor with an ac-driven gate. Nonlinear response to the ac drive is derived utilizing Floquet theory for scattering states in combination with Landauer-Büttiker theory for transport. We identify two regimes that can be useful for applications: (i) low and (ii) high doping of graphene under source and drain contacts, relative to the doping level in the graphene channel, which in an experiment can be varied by a back gate. In both regimes, inelastic scattering induced by the ac drive can excite quasibound states in the channel that leads to resonance promotion of higher-order sidebands. Already for weak to intermediate ac drive strength, this leads to a substantial change in the direct current between source and drain. For strong ac drive with frequency Ω, we compute the higher harmonics of frequencies nΩ (n integer) in the source-drain conductance. In regime (ii), we show that particular harmonics (for instance, n=6) can be selectively enhanced by tuning the doping level in the channel or by tuning the drive strength. We propose that the device operated in the weak-drive regime can be used to detect THz radiation, while in the strong-drive regime, it can be used as a frequency multiplier.

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  • Received 14 July 2016

DOI:https://doi.org/10.1103/PhysRevB.94.125445

©2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Y. Korniyenko1, O. Shevtsov2, and T. Löfwander1

  • 1Department of Microtechnology and Nanoscience - MC2, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
  • 2Department of Physics & Astronomy, Northwestern University, Evanston, Illinois 60208, USA

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Issue

Vol. 94, Iss. 12 — 15 September 2016

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