Effect of uniaxial strain on the optical Drude scattering in graphene

Article Article scientifique Article Effect of uniaxial strain on the optical Drude scattering in graphene eng 2017-04-28 2017-04-28 author Chhikara Manisha 833789 author Gaponenko Iaroslav 654813 author Paruch Patrycja 126293 author Kuzmenko Alexey 0000-0001-9574-6435 135384 025081 10.1088/2053-1583/aa6c10 2053-1583 https://iopscience.iop.org/article/10.1088/2053-1583/aa6c10 Graphene is a mechanically robust 2D material promising for flexible optoelectronic applications. However, its electromagnetic properties under strain are experimentally poorly understood. Here we present the far-infrared transmission spectra of large-area chemical-vapor deposited monolayer graphene on a polyethylene terephthalate substrate subjected to uniaxial strain. The effective strain value is calibrated using the Raman spectroscopy and corrected for a relaxation of wrinkles and folds seen directly by atomic-force microscopy. We find that while the Drude weight and the Fermi level remain constant, the scattering rate increases by more than 10% per 1% of applied strain, showing a high level of reproducibility during strain cycling. As a result, the electronic mobility and optical absorption of graphene at terahertz and lower frequencies appear to also be sensitive to strain, which opens pathways to control these key parameters mechanically. We suggest that such a functionality can be potentially used in flexible optoelectronic and microelectromechanical systems based on graphene. By combining our findings with existing theoretical models, we discuss the possible mechanisms of strain-controlled Drude scattering. Dewey 500.2 European Commission Graphene-based disruptive technologies 696656 GrapheneCore1 EU H2020 33 Département de physique de la matière quantique 131 false 1364 Groupe Kuzmenko 786 Groupe Paruch 2D materials 4 2 800bed96-47e3-49b6-a763-842f6fbb10d8 Article (Published version) Restricted Chhikara_2017_2D_Mater._4_025081.pdf 3281351 application/pdf restrictedAccess Faculté des sciences / Section de physique / Département de physique de la matière quantique

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Effect of uniaxial strain on the optical Drude scattering in graphene	2D materials			2017	533	1

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Chhikara, Manisha