Effect of uni-axial strain on THz/far-infrared response of graphene

Jooyoun Kim, Chul Lee, Sukang Bae, Sang Jin Kim, Keun Soo Kim, Byung Hee Hong, E. J. Choi

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We present polarized optical transmission study of uniaxially strained large scale graphene in THz/far-infrared (IR) frequency region. Graphene was supported on stretchable polyethylene substrate and they were elongated up to 20 (ΔL/L o = 0.2) by applying tensile force. For the IR light polarized along the strain direction (E IR//strain), the optical conductivity σ 1(omega;) of graphene changes from Drude response into strongly non-Drude-like behavior with a peak formed at finite energy ∼10 meV. In contrast, the coherent Drude conductivity is preserved along the direction perpendicular to the strain (E IR⊥strain). Possible origin of the strain-induced non-Drude σ 1(omega;)-behavior is discussed.

Original languageEnglish
Article number041910
JournalApplied Physics Letters
Issue number4
StatePublished - 23 Jan 2012


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