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Boosting the terahertz nonlinearity of graphene by orientation disorder

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Title: Boosting the terahertz nonlinearity of graphene by orientation disorder
Authors: Baek, IH
Hamm, JM
Ahn, KJ
Kang, BJ
Oh, SS
Bae, S
Choi, SY
Hong, BH
Yeom, D-I
Min, B
Hess, O
Jeong, YU
Rotermund, F
Item Type: Journal Article
Abstract: The conical band structure is the cornerstone of graphene's ultra-broadband optical conductivity. For practical use of graphene in nonlinear photonics, however, substantial increases of the light–matter interaction strength will be required while preserving the promising features of monolayers, as the interaction of light with a single atomic layer is limited due to the extremely short interaction length and low density of state, particularly for the long-wavelength region. Here, we report that this demand can be fulfilled by random stacking of high-quality large-area monolayer graphene up to a requested number of layers, which leads to the electronic interaction between layers being effectively switched off due to turbostratic disorder. The nonlinear characteristics of randomly stacked multilayer graphene (RSMG), which originates from a thermo-modulational feedback mechanism through ultrafast free-carrier heating and temperature-dependent carrier-phonon collisions, show clear improvements in the terahertz (THz) regime with increasing layer numbers, whereas as-grown multilayer graphene (AGMG) exhibits limited behaviors due to strong interlayer coupling. This controllable nonlinearity enhancement provides an ideal prerequisite for developing efficient graphene-based THz photonic devices.
Issue Date: 17-Feb-2017
Date of Acceptance: 25-Jan-2017
URI: http://hdl.handle.net/10044/1/45882
DOI: https://dx.doi.org/10.1088/2053-1583/aa5c64
ISSN: 2053-1583
Journal / Book Title: 2D MATERIALS
Volume: 4
Issue: 2
Copyright Statement: © 2017 IOP Publishing Ltd. This is an author-created, un-copyedited version of an article accepted for publication in 2D Materials. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The definitive publisher authenticated version is available online at https://dx.doi.org/10.1088/2053-1583/aa5c64
Sponsor/Funder: The Leverhulme Trust
Engineering & Physical Science Research Council (EPSRC)
Engineering and Physical Sciences Research Council
Funder's Grant Number: RPG-2014-068
Keywords: Science & Technology
Materials Science, Multidisciplinary
Materials Science
random stacking
terahertz nonlinearity
terahertz nonlinear absorption
ultrafast terahertz conductivity
Publication Status: Published
Article Number: ARTN 025035
Appears in Collections:Condensed Matter Theory
Faculty of Natural Sciences