Two-Step Excitation Triggered by One-Photon Absorption on Linear Dispersion in Monolayer Graphene

Takeshi Koyama; Kenta Mizutani; Hiroki Ago; Hideo Kishida

doi:10.1021/acs.jpcc.6b01490

Two-Step Excitation Triggered by One-Photon Absorption on Linear Dispersion in Monolayer Graphene

Takeshi Koyama, Kenta Mizutani, Hiroki Ago, Hideo Kishida

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

1 Citation (Scopus)

Abstract

We report the decrease in absorption caused by a near-infrared laser pulse in the visible region in monolayer graphene. This absorption decrease shows the existence of a two-step excitation process of carriers, in which one-photon absorption and Auger recombination sequentially occur. This process results from the linear dispersion nature of monolayer graphene. In addition, the monolayer graphene shows the ultrafast decay of carrier population. The observed properties are of importance for ultrafast optical switching utilizing the optical nonlinearity induced by carrier excitation.

Original language	English
Pages (from-to)	11225-11229
Number of pages	5
Journal	Journal of Physical Chemistry C
Volume	120
Issue number	20
DOIs	https://doi.org/10.1021/acs.jpcc.6b01490
Publication status	Published - May 26 2016

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Energy(all)
Physical and Theoretical Chemistry
Surfaces, Coatings and Films

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abstract = "We report the decrease in absorption caused by a near-infrared laser pulse in the visible region in monolayer graphene. This absorption decrease shows the existence of a two-step excitation process of carriers, in which one-photon absorption and Auger recombination sequentially occur. This process results from the linear dispersion nature of monolayer graphene. In addition, the monolayer graphene shows the ultrafast decay of carrier population. The observed properties are of importance for ultrafast optical switching utilizing the optical nonlinearity induced by carrier excitation.",

author = "Takeshi Koyama and Kenta Mizutani and Hiroki Ago and Hideo Kishida",

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AU - Koyama, Takeshi

AU - Mizutani, Kenta

AU - Ago, Hiroki

AU - Kishida, Hideo

PY - 2016/5/26

Y1 - 2016/5/26

N2 - We report the decrease in absorption caused by a near-infrared laser pulse in the visible region in monolayer graphene. This absorption decrease shows the existence of a two-step excitation process of carriers, in which one-photon absorption and Auger recombination sequentially occur. This process results from the linear dispersion nature of monolayer graphene. In addition, the monolayer graphene shows the ultrafast decay of carrier population. The observed properties are of importance for ultrafast optical switching utilizing the optical nonlinearity induced by carrier excitation.

AB - We report the decrease in absorption caused by a near-infrared laser pulse in the visible region in monolayer graphene. This absorption decrease shows the existence of a two-step excitation process of carriers, in which one-photon absorption and Auger recombination sequentially occur. This process results from the linear dispersion nature of monolayer graphene. In addition, the monolayer graphene shows the ultrafast decay of carrier population. The observed properties are of importance for ultrafast optical switching utilizing the optical nonlinearity induced by carrier excitation.

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