title: Intrinsic Negative Poisson's Ratio for Single-Layer Graphene.
abstract: Negative Poisson's ratio (NPR) materials have drawn significant interest because the enhanced toughness, shear resistance, and vibration absorption that typically are seen in auxetic materials may enable a range of novel applications. In this work, we report that single-layer graphene exhibits an intrinsic NPR, which is robust and independent of its size and temperature. The NPR arises due to the interplay between two intrinsic deformation pathways (one with positive Poisson's ratio, the other with NPR), which correspond to the bond stretching and angle bending interactions in graphene. We propose an energy-based deformation pathway criteria, which predicts that the pathway with NPR has lower energy and thus becomes the dominant deformation mode when graphene is stretched by a strain above 6%, resulting in the NPR phenomenon.
authors.affiliation: Shanghai Institute of Applied Mathematics and Mechanics, Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai University , Shanghai 200072, People's Republic of China.
authors.forename: Jin-Wu
authors.initials: JW
authors.lastname: Jiang
authors.affiliation: Shanghai Institute of Applied Mathematics and Mechanics, Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai University , Shanghai 200072, People's Republic of China.
authors.forename: Tienchong
authors.initials: T
authors.lastname: Chang
authors.affiliation: Shanghai Institute of Applied Mathematics and Mechanics, Shanghai Key Laboratory of Mechanics in Energy Engineering, Shanghai University , Shanghai 200072, People's Republic of China.
authors.forename: Xingming
authors.initials: X
authors.lastname: Guo
authors.affiliation: Department of Mechanical Engineering, Boston University , Boston, Massachusetts 02215, United States.
authors.forename: Harold S
authors.initials: HS
authors.lastname: Park
keywords: Graphene; intrinsic negative Poisson’s ratio