Phonon and Structural Changes in Deformed Bernal Stacked Bilayer Graphene

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• 作者：Otakar Frank ; Milan Bou拧a ; Ibtsam Riaz ; Rashid Jalil ; Kostya S. Novoselov ; Georgia Tsoukleri ; John Parthenios ; Ladislav Kavan ; Konstantinos Papagelis ; Costas Galiotis
• 刊名：Nano Letters
• 出版年：2012
• 出版时间：February 8, 2012
• 年：2012
• 卷：12
• 期：2
• 页码：687-693
• 全文大小：404K
• 年卷期：v.12,no.2(February 8, 2012)
• ISSN：1530-6992

文摘

We present the first Raman spectroscopic study of Bernal bilayer graphene flakes under uniaxial tension. Apart from a purely mechanical behavior in flake regions where both layers are strained evenly, certain effects stem from inhomogeneous stress distribution across the layers. These phenomena such as the removal of inversion symmetry in bilayer graphene may have important implications in the band gap engineering, providing an alternative route to induce the formation of a band gap.

Keywords:

Bilayer graphene; Raman spectroscopy; strain; tension; band gap