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

doi:10.1063/1.4902096

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

Applied Physics

Research output: Contribution to journal › Article › peer-review

28 Citations (Scopus)

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 language	English
Article number	117118
Journal	AIP Advances
Volume	4
Issue number	11
DOIs	https://doi.org/10.1063/1.4902096
Publication status	Published - Nov 1 2014

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1063/1.4902096

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title = "Nonlinear transmission of an intense terahertz field through monolayer graphene",

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.",

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AU - Hafez, H. A.

AU - Al-Naib, I.

AU - Oguri, K.

AU - Sekine, Y.

AU - Dignam, M. M.

AU - Ibrahim, A.

AU - Cooke, D. G.

AU - Tanaka, S.

AU - Komori, F.

AU - Hibino, H.

AU - Ozaki, T.

PY - 2014/11/1

Y1 - 2014/11/1

N2 - 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.

AB - 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.

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Nonlinear transmission of an intense terahertz field through monolayer graphene

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