title: Nanoscale anisotropic plastic deformation in single crystal GaN.
abstract: Elasto-plastic mechanical deformation behaviors of c-plane (0001) and nonpolar GaN single crystals are studied using nanoindentation, cathodoluminescence, and transmission electron microscopy. Nanoindentation tests show that c-plane GaN is less susceptible to plastic deformation and has higher hardness and Young's modulus than the nonpolar GaN. Cathodoluminescence and transmission electron microscopy characterizations of indent-induced plastic deformation reveal that there are two primary slip systems for the c-plane GaN, while there is only one most favorable slip system for the nonplane GaN. We suggest that the anisotropic elasto-plastic mechanical properties of GaN are relative to its anisotropic plastic deformation behavior.PACS: 62.20.fq; 81.05.Ea; 61.72.Lk.
authors.affiliation: Suzhou Institute of Nano-tech and Nano-bionics, Chinese Academy of Sciences, Ruoshui Road 398, Suzhou, 215123, People's Republic of China. kxu2006@sinano.ac.cn.
authors.forename: Jun
authors.initials: J
authors.lastname: Huang
authors.forename: Ke
authors.initials: K
authors.lastname: Xu
authors.forename: Ying Min
authors.initials: YM
authors.lastname: Fan
authors.forename: Mu Tong
authors.initials: MT
authors.lastname: Niu
authors.forename: Xiong Hui
authors.initials: XH
authors.lastname: Zeng
authors.forename: Jian Feng
authors.initials: JF
authors.lastname: Wang
authors.forename: Hui
authors.initials: H
authors.lastname: Yang