Nonlinear transmission of an intense terahertz field through monolayer graphene

H. A. Hafez, I. Al-Naib, K. Oguri, Y. Sekine, M. M. Dignam, A. Ibrahim, D. G. Cooke, S. Tanaka, F. Komori, H. Hibino, T. Ozaki

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Abstract

We report nonlinear terahertz (THz) effects in monolayer graphene, giving rise to transmission enhancement of a single-cycle THz pulse when the incident THz peak electric field is increased. This transmission enhancement is attributed to reduced photoconductivity, due to saturation effects in the field-induced current and increased intraband scattering rates arising from transient heating of electrons. We have developed a tight-binding model of the response using the length gauge interaction Hamiltonian that provides good qualitative agreement. The model fully accounts for the nonlinear response arising from the linear dispersion energy spectrum in graphene. The results reveal a strong dependence of the scattering time on the THz field, which is at the heart of the observed nonlinear response.

Original languageEnglish
Article number117118
JournalAIP Advances
Volume4
Issue number11
DOIs
Publication statusPublished - Nov 1 2014

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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    Hafez, H. A., Al-Naib, I., Oguri, K., Sekine, Y., Dignam, M. M., Ibrahim, A., Cooke, D. G., Tanaka, S., Komori, F., Hibino, H., & Ozaki, T. (2014). Nonlinear transmission of an intense terahertz field through monolayer graphene. AIP Advances, 4(11), [117118]. https://doi.org/10.1063/1.4902096