Intense terahertz field effects on photoexcited carrier dynamics in gated graphene

Hassan A. Hafez; Pierre L. Lévesque; Ibraheem Al-Naib; Marc M. Dignam; Xin Chai; Saman Choubak; Patrick Desjardins; Richard Martel; Tsuneyuki Ozaki

doi:10.1063/1.4938081

Intense terahertz field effects on photoexcited carrier dynamics in gated graphene

Hassan A. Hafez, Pierre L. Lévesque, Ibraheem Al-Naib, Marc M. Dignam, Xin Chai, Saman Choubak, Patrick Desjardins, Richard Martel, Tsuneyuki Ozaki^*

^*Corresponding author for this work

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

22 Scopus citations

Abstract

We study nonlinear effects of intense terahertz (THz) field on photoexcited carrier dynamics in gated monolayer graphene. By employing optical-pump/intense-THz-probe spectroscopy on lightly doped graphene, we observe a crossover from negative to positive photo-induced THz differential transmission as the THz probe field is increased. We attribute this qualitative change in the response to a crossover from a regime where the photo-induced increase in the carrier density dominates the differential response to one where a THz-field-induced increase in the scattering rate dominates.

Original language	English
Article number	251903
Journal	Applied Physics Letters
Volume	107
Issue number	25
DOIs	https://doi.org/10.1063/1.4938081
State	Published - 21 Dec 2015
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2015 AIP Publishing LLC.

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "Intense terahertz field effects on photoexcited carrier dynamics in gated graphene",

abstract = "We study nonlinear effects of intense terahertz (THz) field on photoexcited carrier dynamics in gated monolayer graphene. By employing optical-pump/intense-THz-probe spectroscopy on lightly doped graphene, we observe a crossover from negative to positive photo-induced THz differential transmission as the THz probe field is increased. We attribute this qualitative change in the response to a crossover from a regime where the photo-induced increase in the carrier density dominates the differential response to one where a THz-field-induced increase in the scattering rate dominates.",

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AU - Hafez, Hassan A.

AU - Lévesque, Pierre L.

AU - Al-Naib, Ibraheem

AU - Dignam, Marc M.

AU - Chai, Xin

AU - Choubak, Saman

AU - Desjardins, Patrick

AU - Martel, Richard

AU - Ozaki, Tsuneyuki

PY - 2015/12/21

Y1 - 2015/12/21

N2 - We study nonlinear effects of intense terahertz (THz) field on photoexcited carrier dynamics in gated monolayer graphene. By employing optical-pump/intense-THz-probe spectroscopy on lightly doped graphene, we observe a crossover from negative to positive photo-induced THz differential transmission as the THz probe field is increased. We attribute this qualitative change in the response to a crossover from a regime where the photo-induced increase in the carrier density dominates the differential response to one where a THz-field-induced increase in the scattering rate dominates.

AB - We study nonlinear effects of intense terahertz (THz) field on photoexcited carrier dynamics in gated monolayer graphene. By employing optical-pump/intense-THz-probe spectroscopy on lightly doped graphene, we observe a crossover from negative to positive photo-induced THz differential transmission as the THz probe field is increased. We attribute this qualitative change in the response to a crossover from a regime where the photo-induced increase in the carrier density dominates the differential response to one where a THz-field-induced increase in the scattering rate dominates.

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JO - Applied Physics Letters

JF - Applied Physics Letters

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ER -

Intense terahertz field effects on photoexcited carrier dynamics in gated graphene

Abstract

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